The Experts below are selected from a list of 222 Experts worldwide ranked by ideXlab platform
Kelly E. Watson - One of the best experts on this subject based on the ideXlab platform.
-
Physicochemical investigation of chemical paint removers: Interactions of Methylene Chloride with polyurethane coatings
Progress in Organic Coatings, 2014Co-Authors: Christopher N. Young, James P. Yesinowski, James H. Wynne, Clive R. Clayton, Kelly E. WatsonAbstract:A variety of thermal and spectroscopic techniques have been used to investigate interactions of the widely-used paint-stripping solvent Methylene Chloride upon model polyurethane coatings. Thermal analysis reveals that Methylene Chloride penetrates and swells the polymer film and leads to a slight depression in the glass transition temperature (Tg) after drying. The 1H NMR spectra and T1 and T1? relaxation times show that Methylene Chloride is responsible for increased polymer segmental motion in the polymer due to swelling, and indicate intimate contact between the Methylene Chloride molecules and the polymer, with no liquid-like pools of the solvent observed. The quadrupolar-echo 2H NMR spectra of CD2Cl2 in the polyurethane over a temperature range of 24 C to -27 C reveal a lengthening of the rotational correlation times of the Methylene Chloride by over four orders of magnitude compared to the neat liquid, indicating restricted mobility due to an interaction with the polymer. Although this interaction is likely due to the electric dipoles in the solvent and the polymer backbone, the absence of significant residual nuclear quadrupole couplings due to a high degree of ordering or solvent immobilization shows that the interaction strength is weak compared to thermal energy (kT). Raman spectroscopy indicates that Methylene Chloride causes swelling by interacting with the carbonyl group responsible for inter-chain bonding, thus permitting dilation. FTIR and Raman spectroscopy demonstrated that Methylene Chloride leads to no irreversible chemical changes in the coating. A common cellulosic chemical stabilizer used in commercial paint removers has been found by XPS to deposit as a thin conformal but heterogeneous coating on the surface of the polymer, suggesting a possible important function to retard evaporation while allowing some permeation. Purpose Commercial military paint stripper is effective because it contains Methylene Chloride; in order to replace it, understanding its mechanism of action/interaction with the coating is crucial. © 2013 Elsevier B.V. All rights reserved.
-
physicochemical investigation of chemical paint removers interactions of Methylene Chloride with polyurethane coatings
Progress in Organic Coatings, 2014Co-Authors: Christopher N. Young, James P. Yesinowski, James H. Wynne, Clive R. Clayton, Kelly E. WatsonAbstract:Abstract A variety of thermal and spectroscopic techniques have been used to investigate interactions of the widely-used paint-stripping solvent Methylene Chloride upon model polyurethane coatings. Thermal analysis reveals that Methylene Chloride penetrates and swells the polymer film and leads to a slight depression in the glass transition temperature ( T g ) after drying. The 1 H NMR spectra and T 1 and T 1ρ relaxation times show that Methylene Chloride is responsible for increased polymer segmental motion in the polymer due to swelling, and indicate intimate contact between the Methylene Chloride molecules and the polymer, with no liquid-like pools of the solvent observed. The quadrupolar-echo 2 H NMR spectra of CD 2 Cl 2 in the polyurethane over a temperature range of 24 °C to −27 °C reveal a lengthening of the rotational correlation times of the Methylene Chloride by over four orders of magnitude compared to the neat liquid, indicating restricted mobility due to an interaction with the polymer. Although this interaction is likely due to the electric dipoles in the solvent and the polymer backbone, the absence of significant residual nuclear quadrupole couplings due to a high degree of ordering or solvent immobilization shows that the interaction strength is weak compared to thermal energy ( kT ). Raman spectroscopy indicates that Methylene Chloride causes swelling by interacting with the carbonyl group responsible for inter-chain bonding, thus permitting dilation. FTIR and Raman spectroscopy demonstrated that Methylene Chloride leads to no irreversible chemical changes in the coating. A common cellulosic chemical stabilizer used in commercial paint removers has been found by XPS to deposit as a thin conformal but heterogeneous coating on the surface of the polymer, suggesting a possible important function to retard evaporation while allowing some permeation. Purpose Commercial military paint stripper is effective because it contains Methylene Chloride; in order to replace it, understanding its mechanism of action/interaction with the coating is crucial.
-
Report on Scientific Basis for Paint Stripping: Mechanism of Methylene Chloride Based Paint Removers
2011Co-Authors: James H. Wynne, Christopher N. Young, James P. Yesinowski, Kelly E. Watson, Clive R. Clayton, Nick Nesteruk, Jack Kelley, Tom BraswellAbstract:Abstract : Chemical paint strippers that include Methylene Chloride and phenol have been extensively used to remove coatings from metallic substrates. These strippers are inexpensive and remove polymeric organic coatings quickly and easily from a variety of metallic substrates without damage to the substrate. Their mechanism of action has not been adequately characterized. Herein we report changes in physical and molecular-level properties of five coatings upon exposure to components of the paint stripper including Methylene Chloride and phenol. The coatings studied were polyurethane topcoats and epoxy primers currently in military use, both clear films and fully pigmented films. The development and use of simplified formulations (clear films) of each coating was done. The coatings were characterized using DSC, TGA, solid state 1H- and 2H-NMR spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy and attenuated total reflectance FTIR. Our results show very different behavior for Methylene Chloride and phenol. Methylene Chloride acts by penetrating the coating and enabling other solvents in penetrating the coating. These other solvents, in particular water and phenol, are responsible for coating degradation.
Christopher N. Young - One of the best experts on this subject based on the ideXlab platform.
-
Physicochemical investigation of chemical paint removers: Interactions of Methylene Chloride with polyurethane coatings
Progress in Organic Coatings, 2014Co-Authors: Christopher N. Young, James P. Yesinowski, James H. Wynne, Clive R. Clayton, Kelly E. WatsonAbstract:A variety of thermal and spectroscopic techniques have been used to investigate interactions of the widely-used paint-stripping solvent Methylene Chloride upon model polyurethane coatings. Thermal analysis reveals that Methylene Chloride penetrates and swells the polymer film and leads to a slight depression in the glass transition temperature (Tg) after drying. The 1H NMR spectra and T1 and T1? relaxation times show that Methylene Chloride is responsible for increased polymer segmental motion in the polymer due to swelling, and indicate intimate contact between the Methylene Chloride molecules and the polymer, with no liquid-like pools of the solvent observed. The quadrupolar-echo 2H NMR spectra of CD2Cl2 in the polyurethane over a temperature range of 24 C to -27 C reveal a lengthening of the rotational correlation times of the Methylene Chloride by over four orders of magnitude compared to the neat liquid, indicating restricted mobility due to an interaction with the polymer. Although this interaction is likely due to the electric dipoles in the solvent and the polymer backbone, the absence of significant residual nuclear quadrupole couplings due to a high degree of ordering or solvent immobilization shows that the interaction strength is weak compared to thermal energy (kT). Raman spectroscopy indicates that Methylene Chloride causes swelling by interacting with the carbonyl group responsible for inter-chain bonding, thus permitting dilation. FTIR and Raman spectroscopy demonstrated that Methylene Chloride leads to no irreversible chemical changes in the coating. A common cellulosic chemical stabilizer used in commercial paint removers has been found by XPS to deposit as a thin conformal but heterogeneous coating on the surface of the polymer, suggesting a possible important function to retard evaporation while allowing some permeation. Purpose Commercial military paint stripper is effective because it contains Methylene Chloride; in order to replace it, understanding its mechanism of action/interaction with the coating is crucial. © 2013 Elsevier B.V. All rights reserved.
-
physicochemical investigation of chemical paint removers interactions of Methylene Chloride with polyurethane coatings
Progress in Organic Coatings, 2014Co-Authors: Christopher N. Young, James P. Yesinowski, James H. Wynne, Clive R. Clayton, Kelly E. WatsonAbstract:Abstract A variety of thermal and spectroscopic techniques have been used to investigate interactions of the widely-used paint-stripping solvent Methylene Chloride upon model polyurethane coatings. Thermal analysis reveals that Methylene Chloride penetrates and swells the polymer film and leads to a slight depression in the glass transition temperature ( T g ) after drying. The 1 H NMR spectra and T 1 and T 1ρ relaxation times show that Methylene Chloride is responsible for increased polymer segmental motion in the polymer due to swelling, and indicate intimate contact between the Methylene Chloride molecules and the polymer, with no liquid-like pools of the solvent observed. The quadrupolar-echo 2 H NMR spectra of CD 2 Cl 2 in the polyurethane over a temperature range of 24 °C to −27 °C reveal a lengthening of the rotational correlation times of the Methylene Chloride by over four orders of magnitude compared to the neat liquid, indicating restricted mobility due to an interaction with the polymer. Although this interaction is likely due to the electric dipoles in the solvent and the polymer backbone, the absence of significant residual nuclear quadrupole couplings due to a high degree of ordering or solvent immobilization shows that the interaction strength is weak compared to thermal energy ( kT ). Raman spectroscopy indicates that Methylene Chloride causes swelling by interacting with the carbonyl group responsible for inter-chain bonding, thus permitting dilation. FTIR and Raman spectroscopy demonstrated that Methylene Chloride leads to no irreversible chemical changes in the coating. A common cellulosic chemical stabilizer used in commercial paint removers has been found by XPS to deposit as a thin conformal but heterogeneous coating on the surface of the polymer, suggesting a possible important function to retard evaporation while allowing some permeation. Purpose Commercial military paint stripper is effective because it contains Methylene Chloride; in order to replace it, understanding its mechanism of action/interaction with the coating is crucial.
-
Report on Scientific Basis for Paint Stripping: Mechanism of Methylene Chloride Based Paint Removers
2011Co-Authors: James H. Wynne, Christopher N. Young, James P. Yesinowski, Kelly E. Watson, Clive R. Clayton, Nick Nesteruk, Jack Kelley, Tom BraswellAbstract:Abstract : Chemical paint strippers that include Methylene Chloride and phenol have been extensively used to remove coatings from metallic substrates. These strippers are inexpensive and remove polymeric organic coatings quickly and easily from a variety of metallic substrates without damage to the substrate. Their mechanism of action has not been adequately characterized. Herein we report changes in physical and molecular-level properties of five coatings upon exposure to components of the paint stripper including Methylene Chloride and phenol. The coatings studied were polyurethane topcoats and epoxy primers currently in military use, both clear films and fully pigmented films. The development and use of simplified formulations (clear films) of each coating was done. The coatings were characterized using DSC, TGA, solid state 1H- and 2H-NMR spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy and attenuated total reflectance FTIR. Our results show very different behavior for Methylene Chloride and phenol. Methylene Chloride acts by penetrating the coating and enabling other solvents in penetrating the coating. These other solvents, in particular water and phenol, are responsible for coating degradation.
Clive R. Clayton - One of the best experts on this subject based on the ideXlab platform.
-
Physicochemical investigation of chemical paint removers: Interactions of Methylene Chloride with polyurethane coatings
Progress in Organic Coatings, 2014Co-Authors: Christopher N. Young, James P. Yesinowski, James H. Wynne, Clive R. Clayton, Kelly E. WatsonAbstract:A variety of thermal and spectroscopic techniques have been used to investigate interactions of the widely-used paint-stripping solvent Methylene Chloride upon model polyurethane coatings. Thermal analysis reveals that Methylene Chloride penetrates and swells the polymer film and leads to a slight depression in the glass transition temperature (Tg) after drying. The 1H NMR spectra and T1 and T1? relaxation times show that Methylene Chloride is responsible for increased polymer segmental motion in the polymer due to swelling, and indicate intimate contact between the Methylene Chloride molecules and the polymer, with no liquid-like pools of the solvent observed. The quadrupolar-echo 2H NMR spectra of CD2Cl2 in the polyurethane over a temperature range of 24 C to -27 C reveal a lengthening of the rotational correlation times of the Methylene Chloride by over four orders of magnitude compared to the neat liquid, indicating restricted mobility due to an interaction with the polymer. Although this interaction is likely due to the electric dipoles in the solvent and the polymer backbone, the absence of significant residual nuclear quadrupole couplings due to a high degree of ordering or solvent immobilization shows that the interaction strength is weak compared to thermal energy (kT). Raman spectroscopy indicates that Methylene Chloride causes swelling by interacting with the carbonyl group responsible for inter-chain bonding, thus permitting dilation. FTIR and Raman spectroscopy demonstrated that Methylene Chloride leads to no irreversible chemical changes in the coating. A common cellulosic chemical stabilizer used in commercial paint removers has been found by XPS to deposit as a thin conformal but heterogeneous coating on the surface of the polymer, suggesting a possible important function to retard evaporation while allowing some permeation. Purpose Commercial military paint stripper is effective because it contains Methylene Chloride; in order to replace it, understanding its mechanism of action/interaction with the coating is crucial. © 2013 Elsevier B.V. All rights reserved.
-
physicochemical investigation of chemical paint removers interactions of Methylene Chloride with polyurethane coatings
Progress in Organic Coatings, 2014Co-Authors: Christopher N. Young, James P. Yesinowski, James H. Wynne, Clive R. Clayton, Kelly E. WatsonAbstract:Abstract A variety of thermal and spectroscopic techniques have been used to investigate interactions of the widely-used paint-stripping solvent Methylene Chloride upon model polyurethane coatings. Thermal analysis reveals that Methylene Chloride penetrates and swells the polymer film and leads to a slight depression in the glass transition temperature ( T g ) after drying. The 1 H NMR spectra and T 1 and T 1ρ relaxation times show that Methylene Chloride is responsible for increased polymer segmental motion in the polymer due to swelling, and indicate intimate contact between the Methylene Chloride molecules and the polymer, with no liquid-like pools of the solvent observed. The quadrupolar-echo 2 H NMR spectra of CD 2 Cl 2 in the polyurethane over a temperature range of 24 °C to −27 °C reveal a lengthening of the rotational correlation times of the Methylene Chloride by over four orders of magnitude compared to the neat liquid, indicating restricted mobility due to an interaction with the polymer. Although this interaction is likely due to the electric dipoles in the solvent and the polymer backbone, the absence of significant residual nuclear quadrupole couplings due to a high degree of ordering or solvent immobilization shows that the interaction strength is weak compared to thermal energy ( kT ). Raman spectroscopy indicates that Methylene Chloride causes swelling by interacting with the carbonyl group responsible for inter-chain bonding, thus permitting dilation. FTIR and Raman spectroscopy demonstrated that Methylene Chloride leads to no irreversible chemical changes in the coating. A common cellulosic chemical stabilizer used in commercial paint removers has been found by XPS to deposit as a thin conformal but heterogeneous coating on the surface of the polymer, suggesting a possible important function to retard evaporation while allowing some permeation. Purpose Commercial military paint stripper is effective because it contains Methylene Chloride; in order to replace it, understanding its mechanism of action/interaction with the coating is crucial.
-
Report on Scientific Basis for Paint Stripping: Mechanism of Methylene Chloride Based Paint Removers
2011Co-Authors: James H. Wynne, Christopher N. Young, James P. Yesinowski, Kelly E. Watson, Clive R. Clayton, Nick Nesteruk, Jack Kelley, Tom BraswellAbstract:Abstract : Chemical paint strippers that include Methylene Chloride and phenol have been extensively used to remove coatings from metallic substrates. These strippers are inexpensive and remove polymeric organic coatings quickly and easily from a variety of metallic substrates without damage to the substrate. Their mechanism of action has not been adequately characterized. Herein we report changes in physical and molecular-level properties of five coatings upon exposure to components of the paint stripper including Methylene Chloride and phenol. The coatings studied were polyurethane topcoats and epoxy primers currently in military use, both clear films and fully pigmented films. The development and use of simplified formulations (clear films) of each coating was done. The coatings were characterized using DSC, TGA, solid state 1H- and 2H-NMR spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy and attenuated total reflectance FTIR. Our results show very different behavior for Methylene Chloride and phenol. Methylene Chloride acts by penetrating the coating and enabling other solvents in penetrating the coating. These other solvents, in particular water and phenol, are responsible for coating degradation.
James P. Yesinowski - One of the best experts on this subject based on the ideXlab platform.
-
Physicochemical investigation of chemical paint removers: Interactions of Methylene Chloride with polyurethane coatings
Progress in Organic Coatings, 2014Co-Authors: Christopher N. Young, James P. Yesinowski, James H. Wynne, Clive R. Clayton, Kelly E. WatsonAbstract:A variety of thermal and spectroscopic techniques have been used to investigate interactions of the widely-used paint-stripping solvent Methylene Chloride upon model polyurethane coatings. Thermal analysis reveals that Methylene Chloride penetrates and swells the polymer film and leads to a slight depression in the glass transition temperature (Tg) after drying. The 1H NMR spectra and T1 and T1? relaxation times show that Methylene Chloride is responsible for increased polymer segmental motion in the polymer due to swelling, and indicate intimate contact between the Methylene Chloride molecules and the polymer, with no liquid-like pools of the solvent observed. The quadrupolar-echo 2H NMR spectra of CD2Cl2 in the polyurethane over a temperature range of 24 C to -27 C reveal a lengthening of the rotational correlation times of the Methylene Chloride by over four orders of magnitude compared to the neat liquid, indicating restricted mobility due to an interaction with the polymer. Although this interaction is likely due to the electric dipoles in the solvent and the polymer backbone, the absence of significant residual nuclear quadrupole couplings due to a high degree of ordering or solvent immobilization shows that the interaction strength is weak compared to thermal energy (kT). Raman spectroscopy indicates that Methylene Chloride causes swelling by interacting with the carbonyl group responsible for inter-chain bonding, thus permitting dilation. FTIR and Raman spectroscopy demonstrated that Methylene Chloride leads to no irreversible chemical changes in the coating. A common cellulosic chemical stabilizer used in commercial paint removers has been found by XPS to deposit as a thin conformal but heterogeneous coating on the surface of the polymer, suggesting a possible important function to retard evaporation while allowing some permeation. Purpose Commercial military paint stripper is effective because it contains Methylene Chloride; in order to replace it, understanding its mechanism of action/interaction with the coating is crucial. © 2013 Elsevier B.V. All rights reserved.
-
physicochemical investigation of chemical paint removers interactions of Methylene Chloride with polyurethane coatings
Progress in Organic Coatings, 2014Co-Authors: Christopher N. Young, James P. Yesinowski, James H. Wynne, Clive R. Clayton, Kelly E. WatsonAbstract:Abstract A variety of thermal and spectroscopic techniques have been used to investigate interactions of the widely-used paint-stripping solvent Methylene Chloride upon model polyurethane coatings. Thermal analysis reveals that Methylene Chloride penetrates and swells the polymer film and leads to a slight depression in the glass transition temperature ( T g ) after drying. The 1 H NMR spectra and T 1 and T 1ρ relaxation times show that Methylene Chloride is responsible for increased polymer segmental motion in the polymer due to swelling, and indicate intimate contact between the Methylene Chloride molecules and the polymer, with no liquid-like pools of the solvent observed. The quadrupolar-echo 2 H NMR spectra of CD 2 Cl 2 in the polyurethane over a temperature range of 24 °C to −27 °C reveal a lengthening of the rotational correlation times of the Methylene Chloride by over four orders of magnitude compared to the neat liquid, indicating restricted mobility due to an interaction with the polymer. Although this interaction is likely due to the electric dipoles in the solvent and the polymer backbone, the absence of significant residual nuclear quadrupole couplings due to a high degree of ordering or solvent immobilization shows that the interaction strength is weak compared to thermal energy ( kT ). Raman spectroscopy indicates that Methylene Chloride causes swelling by interacting with the carbonyl group responsible for inter-chain bonding, thus permitting dilation. FTIR and Raman spectroscopy demonstrated that Methylene Chloride leads to no irreversible chemical changes in the coating. A common cellulosic chemical stabilizer used in commercial paint removers has been found by XPS to deposit as a thin conformal but heterogeneous coating on the surface of the polymer, suggesting a possible important function to retard evaporation while allowing some permeation. Purpose Commercial military paint stripper is effective because it contains Methylene Chloride; in order to replace it, understanding its mechanism of action/interaction with the coating is crucial.
-
Report on Scientific Basis for Paint Stripping: Mechanism of Methylene Chloride Based Paint Removers
2011Co-Authors: James H. Wynne, Christopher N. Young, James P. Yesinowski, Kelly E. Watson, Clive R. Clayton, Nick Nesteruk, Jack Kelley, Tom BraswellAbstract:Abstract : Chemical paint strippers that include Methylene Chloride and phenol have been extensively used to remove coatings from metallic substrates. These strippers are inexpensive and remove polymeric organic coatings quickly and easily from a variety of metallic substrates without damage to the substrate. Their mechanism of action has not been adequately characterized. Herein we report changes in physical and molecular-level properties of five coatings upon exposure to components of the paint stripper including Methylene Chloride and phenol. The coatings studied were polyurethane topcoats and epoxy primers currently in military use, both clear films and fully pigmented films. The development and use of simplified formulations (clear films) of each coating was done. The coatings were characterized using DSC, TGA, solid state 1H- and 2H-NMR spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy and attenuated total reflectance FTIR. Our results show very different behavior for Methylene Chloride and phenol. Methylene Chloride acts by penetrating the coating and enabling other solvents in penetrating the coating. These other solvents, in particular water and phenol, are responsible for coating degradation.
James H. Wynne - One of the best experts on this subject based on the ideXlab platform.
-
Physicochemical investigation of chemical paint removers: Interactions of Methylene Chloride with polyurethane coatings
Progress in Organic Coatings, 2014Co-Authors: Christopher N. Young, James P. Yesinowski, James H. Wynne, Clive R. Clayton, Kelly E. WatsonAbstract:A variety of thermal and spectroscopic techniques have been used to investigate interactions of the widely-used paint-stripping solvent Methylene Chloride upon model polyurethane coatings. Thermal analysis reveals that Methylene Chloride penetrates and swells the polymer film and leads to a slight depression in the glass transition temperature (Tg) after drying. The 1H NMR spectra and T1 and T1? relaxation times show that Methylene Chloride is responsible for increased polymer segmental motion in the polymer due to swelling, and indicate intimate contact between the Methylene Chloride molecules and the polymer, with no liquid-like pools of the solvent observed. The quadrupolar-echo 2H NMR spectra of CD2Cl2 in the polyurethane over a temperature range of 24 C to -27 C reveal a lengthening of the rotational correlation times of the Methylene Chloride by over four orders of magnitude compared to the neat liquid, indicating restricted mobility due to an interaction with the polymer. Although this interaction is likely due to the electric dipoles in the solvent and the polymer backbone, the absence of significant residual nuclear quadrupole couplings due to a high degree of ordering or solvent immobilization shows that the interaction strength is weak compared to thermal energy (kT). Raman spectroscopy indicates that Methylene Chloride causes swelling by interacting with the carbonyl group responsible for inter-chain bonding, thus permitting dilation. FTIR and Raman spectroscopy demonstrated that Methylene Chloride leads to no irreversible chemical changes in the coating. A common cellulosic chemical stabilizer used in commercial paint removers has been found by XPS to deposit as a thin conformal but heterogeneous coating on the surface of the polymer, suggesting a possible important function to retard evaporation while allowing some permeation. Purpose Commercial military paint stripper is effective because it contains Methylene Chloride; in order to replace it, understanding its mechanism of action/interaction with the coating is crucial. © 2013 Elsevier B.V. All rights reserved.
-
physicochemical investigation of chemical paint removers interactions of Methylene Chloride with polyurethane coatings
Progress in Organic Coatings, 2014Co-Authors: Christopher N. Young, James P. Yesinowski, James H. Wynne, Clive R. Clayton, Kelly E. WatsonAbstract:Abstract A variety of thermal and spectroscopic techniques have been used to investigate interactions of the widely-used paint-stripping solvent Methylene Chloride upon model polyurethane coatings. Thermal analysis reveals that Methylene Chloride penetrates and swells the polymer film and leads to a slight depression in the glass transition temperature ( T g ) after drying. The 1 H NMR spectra and T 1 and T 1ρ relaxation times show that Methylene Chloride is responsible for increased polymer segmental motion in the polymer due to swelling, and indicate intimate contact between the Methylene Chloride molecules and the polymer, with no liquid-like pools of the solvent observed. The quadrupolar-echo 2 H NMR spectra of CD 2 Cl 2 in the polyurethane over a temperature range of 24 °C to −27 °C reveal a lengthening of the rotational correlation times of the Methylene Chloride by over four orders of magnitude compared to the neat liquid, indicating restricted mobility due to an interaction with the polymer. Although this interaction is likely due to the electric dipoles in the solvent and the polymer backbone, the absence of significant residual nuclear quadrupole couplings due to a high degree of ordering or solvent immobilization shows that the interaction strength is weak compared to thermal energy ( kT ). Raman spectroscopy indicates that Methylene Chloride causes swelling by interacting with the carbonyl group responsible for inter-chain bonding, thus permitting dilation. FTIR and Raman spectroscopy demonstrated that Methylene Chloride leads to no irreversible chemical changes in the coating. A common cellulosic chemical stabilizer used in commercial paint removers has been found by XPS to deposit as a thin conformal but heterogeneous coating on the surface of the polymer, suggesting a possible important function to retard evaporation while allowing some permeation. Purpose Commercial military paint stripper is effective because it contains Methylene Chloride; in order to replace it, understanding its mechanism of action/interaction with the coating is crucial.
-
Report on Scientific Basis for Paint Stripping: Mechanism of Methylene Chloride Based Paint Removers
2011Co-Authors: James H. Wynne, Christopher N. Young, James P. Yesinowski, Kelly E. Watson, Clive R. Clayton, Nick Nesteruk, Jack Kelley, Tom BraswellAbstract:Abstract : Chemical paint strippers that include Methylene Chloride and phenol have been extensively used to remove coatings from metallic substrates. These strippers are inexpensive and remove polymeric organic coatings quickly and easily from a variety of metallic substrates without damage to the substrate. Their mechanism of action has not been adequately characterized. Herein we report changes in physical and molecular-level properties of five coatings upon exposure to components of the paint stripper including Methylene Chloride and phenol. The coatings studied were polyurethane topcoats and epoxy primers currently in military use, both clear films and fully pigmented films. The development and use of simplified formulations (clear films) of each coating was done. The coatings were characterized using DSC, TGA, solid state 1H- and 2H-NMR spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy and attenuated total reflectance FTIR. Our results show very different behavior for Methylene Chloride and phenol. Methylene Chloride acts by penetrating the coating and enabling other solvents in penetrating the coating. These other solvents, in particular water and phenol, are responsible for coating degradation.