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M. Mercedes Pastor-blas - One of the best experts on this subject based on the ideXlab platform.

  • Improved Adhesion of RF Plasma Treated Rubbers by Isocyanate Incorporation to Polyurethane Adhesive
    Plasma Processes and Polymers, 2008
    Co-Authors: Ana B. Ortíz-magán, M. Mercedes Pastor-blas
    Abstract:

    The effect of addition of isocyanate to a Polyurethane Adhesive has been investigated. Polyurethane Adhesive was used for bonding a thermoplastic (TR) and a vulcanized (VR) synthetic butadiene-styrene rubber. CO 2 plasma treatment has oxidized the rubber surfaces, increasing surface energy (wettability), roughness, and favoring mechanical interlocking of rubber surface with the Adhesive. Adhesion of TR rubber towards PU Polyurethane Adhesive was enhanced by these mechanisms; however, migration of anti-adherent low molecular weight moieties to the VR rubber/Polyurethane Adhesive interface produced a lack of adhesion. In this case, it was necessary to produce the crosslinking with isocyanate of the Polyurethane Adhesive and of the VR rubber surface.

  • Migration of Processing Oils of Thermoplastic Rubber Treated with RF Plasma
    Plasma Chemistry and Plasma Processing, 2008
    Co-Authors: Ana B. Ortíz-magán, M. Mercedes Pastor-blas
    Abstract:

    The surface modifications produced by a RF plasma treatment on a thermoplastic styrene–butadiene–styrene rubber–SBS—with a considerable amount of processing oils in its formulation (TRO) have been studied and compared to the modifications produced on an oil-free SBS rubber (TRF). The modifications produced by the plasmas on the rubber surface depended on the nature of the gas used to generate the plasma. Thus, argon plasma favored the migration of processing oils to the TRO rubber surface, producing a weak oily layer that prevented interaction of rubber with a Polyurethane Adhesive. On the other hand, oxygen and carbon dioxide plasmas produced important ablation of the rubber surface which resulted in a partial (CO_2 plasma) or total (O_2 plasma) removal of processing oils from the rubber surface and the creation of polar moieties that increased adhesion of the rubber surface towards a Polyurethane Adhesive.

Vijay Kumar Sinha - One of the best experts on this subject based on the ideXlab platform.

  • Polyurethane Adhesive system from biomaterial-based polyol for bonding wood
    International Journal of Adhesion and Adhesives, 2003
    Co-Authors: Sandip D. Desai, Jigar V. Patel, Vijay Kumar Sinha
    Abstract:

    Polyester polyols for use in the preparation of Polyurethane (PU) Adhesives were synthesized from potato starch and natural oils by a transesterification reaction. These polyester polyols were combined with an aromatic adduct based on toluene 2,4-diisocyanate to form a PU Adhesive. Both the polyols and the PU Adhesives were characterized by means of FTIR spectroscopy. The Adhesive performance of the PU Adhesives in bonding wood was evaluated by lap shear tests. The effect on adhesion of variation of NCO/OH ratio and hydroxyl value were studied. The change in lap shear strength before and after exposure to cold water, hot water, acid, and alkali were evaluated. Development of bond strength to wood was determined by means of tests at regular intervals, and also curing time required for different Adhesive formulations were determined. The PU Adhesive derived from natural products was found superior to the commercially available Adhesive. ?? 2003 Elsevier Ltd. All rights reserved.

  • Biomaterial Based Polyurethane Adhesive for Bonding Rubber and Wood Joints
    Journal of Polymer Research, 2003
    Co-Authors: Sandip D. Desai, Anurag L. Emanuel, Vijay Kumar Sinha
    Abstract:

    An intermediate compound for synthesizing polyester polyol was prepared from glycosylation of potato starch by reacting it with ethylene glycol in presence of sulphuric acid. Glycol glycoside thus prepared was characterized by HPLC and FTIR. This polyhydroxy compound was replaced in varying amounts with trimethylolpropane for polyester polyol synthesis. Sebacic acid was used as dicarboxylic acid along with castor oil for polyester polyol formulation. Polyols were reacted with toluene 2,4-diisocyanate adduct for Polyurethane formation. Polyester polyol and Polyurethane were characterized by FTIR. Polyurethane was utilized for bonding wood as well as rubber joints. Bond strength was measured by means of lap shear strength and peel strength for wood and rubber joints, respectively. Chemical resistance of Polyurethane Adhesive was also evaluated.

  • Polyurethane Adhesive system from biomaterial based polyol for bonding wood
    International Journal of Adhesion and Adhesives, 2003
    Co-Authors: Sandip D. Desai, Jigar V. Patel, Vijay Kumar Sinha
    Abstract:

    Polyester polyols for use in the preparation of Polyurethane (PU) Adhesives were synthesized from potato starch and natural oils by a transesterification reaction. These polyester polyols were combined with an aromatic adduct based on toluene 2,4-diisocyanate to form a PU Adhesive. Both the polyols and the PU Adhesives were characterized by means of FTIR spectroscopy. The Adhesive performance of the PU Adhesives in bonding wood was evaluated by lap shear tests. The effect on adhesion of variation of NCO/OH ratio and hydroxyl value were studied. The change in lap shear strength before and after exposure to cold water, hot water, acid, and alkali were evaluated. Development of bond strength to wood was determined by means of tests at regular intervals, and also curing time required for different Adhesive formulations were determined. The PU Adhesive derived from natural products was found superior to the commercially available Adhesive.

Sandip D. Desai - One of the best experts on this subject based on the ideXlab platform.

  • PET waste based Polyurethane Adhesive for rubber joints
    Indian Journal of Chemical Technology, 2020
    Co-Authors: Sandip D. Desai, J. V. Patel, M. R. Patel, V. K. Sinha
    Abstract:

    Biomaterial based polyhydric compounds were synthesized and utilized for the depolymerization of PET. Three different oligomers were synthesized by using 5, 15 and 25% PET. Depolymerized oligomers were esterified with dehydrated castor oil (DCO) fatty acids to give polyester polyols. Polyurethane Adhesives were synthesized using these polyols for joining rubber-rubber assembly. Bond strength was measured by 180° peel test. Mode of failure was studied by scanning electron microscopy (SEM) analysis. Depolymerised PET oligomers, polyols and Polyurethane were characterized by FTIR spectroscopy. Also, Polyurethane Adhesives were evaluated for their performance and chemical resistance.

  • Polyurethane Adhesive system from biomaterial-based polyol for bonding wood
    International Journal of Adhesion and Adhesives, 2003
    Co-Authors: Sandip D. Desai, Jigar V. Patel, Vijay Kumar Sinha
    Abstract:

    Polyester polyols for use in the preparation of Polyurethane (PU) Adhesives were synthesized from potato starch and natural oils by a transesterification reaction. These polyester polyols were combined with an aromatic adduct based on toluene 2,4-diisocyanate to form a PU Adhesive. Both the polyols and the PU Adhesives were characterized by means of FTIR spectroscopy. The Adhesive performance of the PU Adhesives in bonding wood was evaluated by lap shear tests. The effect on adhesion of variation of NCO/OH ratio and hydroxyl value were studied. The change in lap shear strength before and after exposure to cold water, hot water, acid, and alkali were evaluated. Development of bond strength to wood was determined by means of tests at regular intervals, and also curing time required for different Adhesive formulations were determined. The PU Adhesive derived from natural products was found superior to the commercially available Adhesive. ?? 2003 Elsevier Ltd. All rights reserved.

  • Biomaterial Based Polyurethane Adhesive for Bonding Rubber and Wood Joints
    Journal of Polymer Research, 2003
    Co-Authors: Sandip D. Desai, Anurag L. Emanuel, Vijay Kumar Sinha
    Abstract:

    An intermediate compound for synthesizing polyester polyol was prepared from glycosylation of potato starch by reacting it with ethylene glycol in presence of sulphuric acid. Glycol glycoside thus prepared was characterized by HPLC and FTIR. This polyhydroxy compound was replaced in varying amounts with trimethylolpropane for polyester polyol synthesis. Sebacic acid was used as dicarboxylic acid along with castor oil for polyester polyol formulation. Polyols were reacted with toluene 2,4-diisocyanate adduct for Polyurethane formation. Polyester polyol and Polyurethane were characterized by FTIR. Polyurethane was utilized for bonding wood as well as rubber joints. Bond strength was measured by means of lap shear strength and peel strength for wood and rubber joints, respectively. Chemical resistance of Polyurethane Adhesive was also evaluated.

  • Polyurethane Adhesive system from biomaterial based polyol for bonding wood
    International Journal of Adhesion and Adhesives, 2003
    Co-Authors: Sandip D. Desai, Jigar V. Patel, Vijay Kumar Sinha
    Abstract:

    Polyester polyols for use in the preparation of Polyurethane (PU) Adhesives were synthesized from potato starch and natural oils by a transesterification reaction. These polyester polyols were combined with an aromatic adduct based on toluene 2,4-diisocyanate to form a PU Adhesive. Both the polyols and the PU Adhesives were characterized by means of FTIR spectroscopy. The Adhesive performance of the PU Adhesives in bonding wood was evaluated by lap shear tests. The effect on adhesion of variation of NCO/OH ratio and hydroxyl value were studied. The change in lap shear strength before and after exposure to cold water, hot water, acid, and alkali were evaluated. Development of bond strength to wood was determined by means of tests at regular intervals, and also curing time required for different Adhesive formulations were determined. The PU Adhesive derived from natural products was found superior to the commercially available Adhesive.

Ana B. Ortíz-magán - One of the best experts on this subject based on the ideXlab platform.

  • Improved Adhesion of RF Plasma Treated Rubbers by Isocyanate Incorporation to Polyurethane Adhesive
    Plasma Processes and Polymers, 2008
    Co-Authors: Ana B. Ortíz-magán, M. Mercedes Pastor-blas
    Abstract:

    The effect of addition of isocyanate to a Polyurethane Adhesive has been investigated. Polyurethane Adhesive was used for bonding a thermoplastic (TR) and a vulcanized (VR) synthetic butadiene-styrene rubber. CO 2 plasma treatment has oxidized the rubber surfaces, increasing surface energy (wettability), roughness, and favoring mechanical interlocking of rubber surface with the Adhesive. Adhesion of TR rubber towards PU Polyurethane Adhesive was enhanced by these mechanisms; however, migration of anti-adherent low molecular weight moieties to the VR rubber/Polyurethane Adhesive interface produced a lack of adhesion. In this case, it was necessary to produce the crosslinking with isocyanate of the Polyurethane Adhesive and of the VR rubber surface.

  • Migration of Processing Oils of Thermoplastic Rubber Treated with RF Plasma
    Plasma Chemistry and Plasma Processing, 2008
    Co-Authors: Ana B. Ortíz-magán, M. Mercedes Pastor-blas
    Abstract:

    The surface modifications produced by a RF plasma treatment on a thermoplastic styrene–butadiene–styrene rubber–SBS—with a considerable amount of processing oils in its formulation (TRO) have been studied and compared to the modifications produced on an oil-free SBS rubber (TRF). The modifications produced by the plasmas on the rubber surface depended on the nature of the gas used to generate the plasma. Thus, argon plasma favored the migration of processing oils to the TRO rubber surface, producing a weak oily layer that prevented interaction of rubber with a Polyurethane Adhesive. On the other hand, oxygen and carbon dioxide plasmas produced important ablation of the rubber surface which resulted in a partial (CO_2 plasma) or total (O_2 plasma) removal of processing oils from the rubber surface and the creation of polar moieties that increased adhesion of the rubber surface towards a Polyurethane Adhesive.

Chen Huan-qin - One of the best experts on this subject based on the ideXlab platform.