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Smita Mohanty - One of the best experts on this subject based on the ideXlab platform.
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Curing kinetics of bio-based Epoxy Resin-toughened DGEBA Epoxy Resin blend
Journal of Thermal Analysis and Calorimetry, 2019Co-Authors: Sudheer Kumar, Sapan Kumar Samal, Smita MohantyAbstract:In the present study, TEIA bioResin was blended with the diglycidyl ether bisphenol A (DGEBA) Epoxy Resin in different ratios (i.e. 10, 20, 30, 40 mass%), cured with methylhexahydrophthalic anhydride curing agent in the presence of 2-methylimidazole catalyst. The optimized composition of DGEBA and TEIA bioResin blends system was employed as an adhesive strength. The adhesive strength of the TEIA-modified DGEBA Epoxy Resin blend system was increased from 4.14 to 6.31 MPa on an aluminium substrate compared to the DGEBA Epoxy Resin. The curing kinetics of non-isothermal, DGEBA Epoxy Resin and its bio-based blend systems were investigated employing differential scanning calorimetry. An increase in the peak temperature and reduction in a heat of curing as well as activation energy in DGEBA Epoxy Resin were observed with the addition of TEIA bioResin content. The activation energy ( E _a) of the DGEBA Resin and their bio-based blend system were obtained from Kissinger and Flynn–Wall–Ozawa methods.
Ann-therese Karlberg - One of the best experts on this subject based on the ideXlab platform.
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Assessment of cross‐reactivity of new less sensitizing Epoxy Resin monomers in Epoxy Resin‐allergic individuals
Contact Dermatitis, 2016Co-Authors: Lina Hagvall, Ida B. Niklasson, Johanna Rudbäck, Niamh M. O’boyle, Eva Niklasson, Kristina Luthman, Ann-therese KarlbergAbstract:SummaryBackground Measures to prevent occupational exposure to Epoxy Resins, including education, medical examination, and voluntary agreements between employers and workers, have not been effective enough to protect against skin sensitization. Therefore, alternatives to the major Epoxy Resin haptens that have been found to be less sensitizing in the local lymph node assay have been developed. Objectives To study the cross-reactivity of two newly designed Epoxy Resin monomers, with decreased skin-sensitizing potency and good technical properties as compared with diglycidyl ether of bisphenol A (DGEBA), in subjects with known contact allergy to Epoxy Resin of DGEBA type. Patients and Methods Eleven individuals with previous positive patch test reactions to Epoxy Resin of DGEBA participated in the study. The two alternative Epoxy Resin monomers were synthesized and patch tested in dilution series in parallel with Epoxy Resin of DGEBA from the baseline series (containing 92% DGEBA). Results All participants reacted to Epoxy Resin of DGEBA on retesting. Three participants reacted to monomer 1. No reactions were seen to monomer 2. Conclusions The alternative monomers studied showed little or no cross-reactivity with Epoxy Resin of DGEBA. Decreasing the risk of sensitization by using less sensitizing compounds is important, as contact allergy to Epoxy Resins is common in spite of thorough preventive measures.
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Assessment of cross-reactivity of new less sensitizing Epoxy Resin monomers in Epoxy Resin-allergic individuals.
Contact Dermatitis, 2016Co-Authors: Lina Hagvall, Ida B. Niklasson, Johanna Rudbäck, Eva Niklasson, Kristina Luthman, Niamh M. O’boyle, Ann-therese KarlbergAbstract:SummaryBackground Measures to prevent occupational exposure to Epoxy Resins, including education, medical examination, and voluntary agreements between employers and workers, have not been effective enough to protect against skin sensitization. Therefore, alternatives to the major Epoxy Resin haptens that have been found to be less sensitizing in the local lymph node assay have been developed. Objectives To study the cross-reactivity of two newly designed Epoxy Resin monomers, with decreased skin-sensitizing potency and good technical properties as compared with diglycidyl ether of bisphenol A (DGEBA), in subjects with known contact allergy to Epoxy Resin of DGEBA type. Patients and Methods Eleven individuals with previous positive patch test reactions to Epoxy Resin of DGEBA participated in the study. The two alternative Epoxy Resin monomers were synthesized and patch tested in dilution series in parallel with Epoxy Resin of DGEBA from the baseline series (containing 92% DGEBA). Results All participants reacted to Epoxy Resin of DGEBA on retesting. Three participants reacted to monomer 1. No reactions were seen to monomer 2. Conclusions The alternative monomers studied showed little or no cross-reactivity with Epoxy Resin of DGEBA. Decreasing the risk of sensitization by using less sensitizing compounds is important, as contact allergy to Epoxy Resins is common in spite of thorough preventive measures.
Sudheer Kumar - One of the best experts on this subject based on the ideXlab platform.
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Curing kinetics of bio-based Epoxy Resin-toughened DGEBA Epoxy Resin blend
Journal of Thermal Analysis and Calorimetry, 2019Co-Authors: Sudheer Kumar, Sapan Kumar Samal, Smita MohantyAbstract:In the present study, TEIA bioResin was blended with the diglycidyl ether bisphenol A (DGEBA) Epoxy Resin in different ratios (i.e. 10, 20, 30, 40 mass%), cured with methylhexahydrophthalic anhydride curing agent in the presence of 2-methylimidazole catalyst. The optimized composition of DGEBA and TEIA bioResin blends system was employed as an adhesive strength. The adhesive strength of the TEIA-modified DGEBA Epoxy Resin blend system was increased from 4.14 to 6.31 MPa on an aluminium substrate compared to the DGEBA Epoxy Resin. The curing kinetics of non-isothermal, DGEBA Epoxy Resin and its bio-based blend systems were investigated employing differential scanning calorimetry. An increase in the peak temperature and reduction in a heat of curing as well as activation energy in DGEBA Epoxy Resin were observed with the addition of TEIA bioResin content. The activation energy ( E _a) of the DGEBA Resin and their bio-based blend system were obtained from Kissinger and Flynn–Wall–Ozawa methods.
Lina Hagvall - One of the best experts on this subject based on the ideXlab platform.
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Assessment of cross‐reactivity of new less sensitizing Epoxy Resin monomers in Epoxy Resin‐allergic individuals
Contact Dermatitis, 2016Co-Authors: Lina Hagvall, Ida B. Niklasson, Johanna Rudbäck, Niamh M. O’boyle, Eva Niklasson, Kristina Luthman, Ann-therese KarlbergAbstract:SummaryBackground Measures to prevent occupational exposure to Epoxy Resins, including education, medical examination, and voluntary agreements between employers and workers, have not been effective enough to protect against skin sensitization. Therefore, alternatives to the major Epoxy Resin haptens that have been found to be less sensitizing in the local lymph node assay have been developed. Objectives To study the cross-reactivity of two newly designed Epoxy Resin monomers, with decreased skin-sensitizing potency and good technical properties as compared with diglycidyl ether of bisphenol A (DGEBA), in subjects with known contact allergy to Epoxy Resin of DGEBA type. Patients and Methods Eleven individuals with previous positive patch test reactions to Epoxy Resin of DGEBA participated in the study. The two alternative Epoxy Resin monomers were synthesized and patch tested in dilution series in parallel with Epoxy Resin of DGEBA from the baseline series (containing 92% DGEBA). Results All participants reacted to Epoxy Resin of DGEBA on retesting. Three participants reacted to monomer 1. No reactions were seen to monomer 2. Conclusions The alternative monomers studied showed little or no cross-reactivity with Epoxy Resin of DGEBA. Decreasing the risk of sensitization by using less sensitizing compounds is important, as contact allergy to Epoxy Resins is common in spite of thorough preventive measures.
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Assessment of cross-reactivity of new less sensitizing Epoxy Resin monomers in Epoxy Resin-allergic individuals.
Contact Dermatitis, 2016Co-Authors: Lina Hagvall, Ida B. Niklasson, Johanna Rudbäck, Eva Niklasson, Kristina Luthman, Niamh M. O’boyle, Ann-therese KarlbergAbstract:SummaryBackground Measures to prevent occupational exposure to Epoxy Resins, including education, medical examination, and voluntary agreements between employers and workers, have not been effective enough to protect against skin sensitization. Therefore, alternatives to the major Epoxy Resin haptens that have been found to be less sensitizing in the local lymph node assay have been developed. Objectives To study the cross-reactivity of two newly designed Epoxy Resin monomers, with decreased skin-sensitizing potency and good technical properties as compared with diglycidyl ether of bisphenol A (DGEBA), in subjects with known contact allergy to Epoxy Resin of DGEBA type. Patients and Methods Eleven individuals with previous positive patch test reactions to Epoxy Resin of DGEBA participated in the study. The two alternative Epoxy Resin monomers were synthesized and patch tested in dilution series in parallel with Epoxy Resin of DGEBA from the baseline series (containing 92% DGEBA). Results All participants reacted to Epoxy Resin of DGEBA on retesting. Three participants reacted to monomer 1. No reactions were seen to monomer 2. Conclusions The alternative monomers studied showed little or no cross-reactivity with Epoxy Resin of DGEBA. Decreasing the risk of sensitization by using less sensitizing compounds is important, as contact allergy to Epoxy Resins is common in spite of thorough preventive measures.
Xiong Yuan-qin - One of the best experts on this subject based on the ideXlab platform.
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Development of Waterborne Epoxy Resin Emulsion
Paint and Coatings Industry, 2004Co-Authors: Xiong Yuan-qinAbstract:A self-emulsified Epoxy Resin is prepared with low MW Epoxy Resin, Bisphenol A, and polyether, which is further used to prepare the title waterborne Epoxy Resin emulsion by phase conversion technology. The influence of the MW of polyether, ratio of Epoxy Resin, polyether and Bisphenot A, and charging approach on the particle size and stability of emulsion is discussed.