The Experts below are selected from a list of 45 Experts worldwide ranked by ideXlab platform

Syed Qutubuddin - One of the best experts on this subject based on the ideXlab platform.

  • polymerization behavior of Methylol functional benzoxazine monomer
    Reactive & Functional Polymers, 2013
    Co-Authors: Mohamed Baqar, Hatsuo Ishida, Tarek Agag, Syed Qutubuddin
    Abstract:

    Abstract This study focuses on Methylol functional benzoxazines as precursors to build a network structure utilizing both benzoxazine and resole chemistry. The first part is a review of systems that contain Methylol Groups which play a role on their crosslinking formation. The polymerization mechanism and properties of resoles will be highlighted as the most abundant polymers that are characterized by polymerization through condensation reaction of Methylol Group. In the second part, the effect of incorporating Methylol Group into benzoxazine monomers is studied. Differential scanning calorimetry (DSC) is used to study the effect of Methylol Group on the rate of polymerization. Kissinger and Ozawa methods using non-isothermal DSC at different heating rates show that Methylol monomer exhibits lower average activation energy compared to the un-functionalized monomer. The effect of adding catalysts into the monomers is also studied. p -Toluene sulfonic acid (PTSA) is found to be more efficient than 1-methyl-imidazole (IMD) and lithium iodide (LiI) in the case of Methylol monomer due to its ability of accelerating both the Methylol condensation and ring-opening polymerization. Additionally, thermal behavior of the monomers is studied using thermogravimetric analysis (TGA).

Y S Tilak - One of the best experts on this subject based on the ideXlab platform.

  • Synthesis, Characterization and Glass -Reinforced Composites of N,N'-DiMethylolthiourea - m-Aminophenol Resin
    2020
    Co-Authors: K D Patel, M M Morekar, Y S Tilak
    Abstract:

    Abstract: N,N'-DiMethylolthiourea (DMTU) resin having the Methylol Group ( -CH2OH ) has been prepared and characterized. The condensation of DMTU resin with m-aminophenol was carried out in the presence of alcoholic alkali catalyst at varying ratios of DMTU: mAP, namely 1:1, 1:1.5 and 1:2. The resultant DMTUmAP resin was characterized by elemental analysis, IR spectral studies, number average molecular weight ( ) estimated by non-aqueous conductometric titration, and thermogravimetry. The curing study of DMTUmAP resin with hexamethylenetetramine (HMTA) was monitored by differential scanning calorimetry (DSC) and kinetic parameters were evaluated. Glass-reinforced composites based on the DMTUmAP-HMTA system have also been prepared and characterized

  • Synthesis, Characterization and Glass - Reinforced Composites of N,N'-DiMethylolthiourea – m-Aminophenol Resin
    Hindawi Limited, 2005
    Co-Authors: K D Patel, M M Morekar, Y S Tilak
    Abstract:

    N,N’-DiMethylolthiourea (DMTU) resin having the Methylol Group ( –CH2 OH ) has been prepared and characterized. The condensation of DMTU resin with m-aminophenol was carried out in the presence of alcoholic alkali catalyst at varying ratios of DMTU: mAP, namely 1:1, 1:1.5 and 1:2. The resultant DMTUmAP resin was characterized by elemental analysis, IR spectral studies, number average molecular weight (M¯n ) estimated by non-aqueous conductometric titration, and thermogravimetry. The curing study of DMTUmAP resin with hexamethylenetetramine (HMTA) was monitored by differential scanning calorimetry (DSC) and kinetic parameters were evaluated. Glass-reinforced composites based on the DMTUmAP-HMTA system have also been prepared and characterized

  • Synthesis, Characterization and Glass - Reinforced Composites of Thiourea - Formaldehyde - Phenol Resin
    Hindawi Limited, 2004
    Co-Authors: K D Patel, M M Morekar, Dhirubhai J. Desai, Y S Tilak
    Abstract:

    N,N'-DiMethylol thiourea-formaldehyde (DMTUF) resin having the Methylol Group (CH2OH) has been prepared and characterized. The condensation of DMTUF resin with Phenol (P) was carried out in the presence of alcoholic alkali catalyst at varying ratios of DMTUF: P, namely 1:1, 1:1.5 and 1:2. The resultant DMTUFP resin was characterized by elemental analysis, IR spectral studies, number average molecular weight ( M¯n ) estimated by non-aqueous conductometric titration, and thermo gravimetry. The curing study of DMTUFP resin with hexamethylene tetramine (HMTA) was monitored by differential scanning calorimetry (DSC) and kinetic parameters were evaluated. Glass-reinforced composites based on the DMTUFP-HMTA system have also been prepared and characterized

Mohamed Baqar - One of the best experts on this subject based on the ideXlab platform.

  • polymerization behavior of Methylol functional benzoxazine monomer
    Reactive & Functional Polymers, 2013
    Co-Authors: Mohamed Baqar, Hatsuo Ishida, Tarek Agag, Syed Qutubuddin
    Abstract:

    Abstract This study focuses on Methylol functional benzoxazines as precursors to build a network structure utilizing both benzoxazine and resole chemistry. The first part is a review of systems that contain Methylol Groups which play a role on their crosslinking formation. The polymerization mechanism and properties of resoles will be highlighted as the most abundant polymers that are characterized by polymerization through condensation reaction of Methylol Group. In the second part, the effect of incorporating Methylol Group into benzoxazine monomers is studied. Differential scanning calorimetry (DSC) is used to study the effect of Methylol Group on the rate of polymerization. Kissinger and Ozawa methods using non-isothermal DSC at different heating rates show that Methylol monomer exhibits lower average activation energy compared to the un-functionalized monomer. The effect of adding catalysts into the monomers is also studied. p -Toluene sulfonic acid (PTSA) is found to be more efficient than 1-methyl-imidazole (IMD) and lithium iodide (LiI) in the case of Methylol monomer due to its ability of accelerating both the Methylol condensation and ring-opening polymerization. Additionally, thermal behavior of the monomers is studied using thermogravimetric analysis (TGA).

K D Patel - One of the best experts on this subject based on the ideXlab platform.

  • Synthesis, Characterization and Glass -Reinforced Composites of N,N'-DiMethylolthiourea - m-Aminophenol Resin
    2020
    Co-Authors: K D Patel, M M Morekar, Y S Tilak
    Abstract:

    Abstract: N,N'-DiMethylolthiourea (DMTU) resin having the Methylol Group ( -CH2OH ) has been prepared and characterized. The condensation of DMTU resin with m-aminophenol was carried out in the presence of alcoholic alkali catalyst at varying ratios of DMTU: mAP, namely 1:1, 1:1.5 and 1:2. The resultant DMTUmAP resin was characterized by elemental analysis, IR spectral studies, number average molecular weight ( ) estimated by non-aqueous conductometric titration, and thermogravimetry. The curing study of DMTUmAP resin with hexamethylenetetramine (HMTA) was monitored by differential scanning calorimetry (DSC) and kinetic parameters were evaluated. Glass-reinforced composites based on the DMTUmAP-HMTA system have also been prepared and characterized

  • Synthesis, Characterization and Glass - Reinforced Composites of N,N'-DiMethylolthiourea – m-Aminophenol Resin
    Hindawi Limited, 2005
    Co-Authors: K D Patel, M M Morekar, Y S Tilak
    Abstract:

    N,N’-DiMethylolthiourea (DMTU) resin having the Methylol Group ( –CH2 OH ) has been prepared and characterized. The condensation of DMTU resin with m-aminophenol was carried out in the presence of alcoholic alkali catalyst at varying ratios of DMTU: mAP, namely 1:1, 1:1.5 and 1:2. The resultant DMTUmAP resin was characterized by elemental analysis, IR spectral studies, number average molecular weight (M¯n ) estimated by non-aqueous conductometric titration, and thermogravimetry. The curing study of DMTUmAP resin with hexamethylenetetramine (HMTA) was monitored by differential scanning calorimetry (DSC) and kinetic parameters were evaluated. Glass-reinforced composites based on the DMTUmAP-HMTA system have also been prepared and characterized

  • Synthesis, Characterization and Glass - Reinforced Composites of Thiourea - Formaldehyde - Phenol Resin
    Hindawi Limited, 2004
    Co-Authors: K D Patel, M M Morekar, Dhirubhai J. Desai, Y S Tilak
    Abstract:

    N,N'-DiMethylol thiourea-formaldehyde (DMTUF) resin having the Methylol Group (CH2OH) has been prepared and characterized. The condensation of DMTUF resin with Phenol (P) was carried out in the presence of alcoholic alkali catalyst at varying ratios of DMTUF: P, namely 1:1, 1:1.5 and 1:2. The resultant DMTUFP resin was characterized by elemental analysis, IR spectral studies, number average molecular weight ( M¯n ) estimated by non-aqueous conductometric titration, and thermo gravimetry. The curing study of DMTUFP resin with hexamethylene tetramine (HMTA) was monitored by differential scanning calorimetry (DSC) and kinetic parameters were evaluated. Glass-reinforced composites based on the DMTUFP-HMTA system have also been prepared and characterized

In Jae Chung - One of the best experts on this subject based on the ideXlab platform.

  • synthesis and characterization of resol type phenolic resin layered silicate nanocomposites
    Chemistry of Materials, 2001
    Co-Authors: Ho Yun Byun, Min Ho Choi, In Jae Chung
    Abstract:

    Resol type phenolic resin/layered silicate nanocomposites (RPLSNs) are prepared by melt intercalation using various layered silicates such as sodium montmorillonite (MMT) and ω-amino acid modified montmorillonites (C3M, C6M, and C12M). The most hydrophilic MMT is the most compatible with the resol type phenolic resin (KL) at the beginning of cure due to the initial hydrophilicity of KL with many Methylol Groups. However, KL is deintercalated out of extragallery of MMT during the cure since the KL lose hydrophilicity by the depletion of Methylol Groups. It is found that the C6M has the best miscibility with KL at the entire cure stage. The KLC6M system has the best mechanical properties, due to the end-tethered structure formed by the reaction between the organic modifier (carboxylic acid) of C6M and the Methylol Group of KL, as well as the excellent dispersion of silicate layers. RPLSNs have similar thermal stability to the neat phenolic resin.