Design, synthesis, and characterization of bismaleimide Co - curing elastomers / Karthik Vikram Siva Shanmugam in Industrial & engineering chemistry research, Vol. 51 N° 26 (Juillet 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 26 (Juillet 2012) . - pp. 8957–8965 Titre : Design, synthesis, and characterization of bismaleimide Co - curing elastomers Type de document : texte imprimé Auteurs : Karthik Vikram Siva Shanmugam, Auteur ; J. Scott Parent, Auteur ; Ralph A. Whitney, Auteur Année de publication : 2012 Article en page(s) : pp. 8957–8965 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Elastomers Copolymerization Résumé : Isobutylene-rich elastomers bearing functional groups that engage N-arylmaleimides in C–H bond addition and/or alternating copolymerization are described. While inactive to cross-linking when treated at high temperature with peroxide alone, these co-curing elastomers can be cross-linked substantially when combined with bismaleimide coagents such as N,N′-m-phenylenedimaleimide (BMI). Poly(isobutylene-co-isoprene) (IIR) samples containing relatively high amounts of residual isoprene unsaturation are shown to provide relatively low coagent cure reactivity, whereas IIR derivatives bearing pendant polyether or vinyl ether functionality are shown to provide exceptional cross-linking rates and extents when treated with identical BMI formulations. The design of such co-curing elastomers is discussed, along with the physical properties of the resulting vulcanizates. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300795b [article] Design, synthesis, and characterization of bismaleimide Co - curing elastomers [texte imprimé] / Karthik Vikram Siva Shanmugam, Auteur ; J. Scott Parent, Auteur ; Ralph A. Whitney, Auteur . - 2012 . - pp. 8957–8965. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 26 (Juillet 2012) . - pp. 8957–8965 Mots-clés : Elastomers Copolymerization Résumé : Isobutylene-rich elastomers bearing functional groups that engage N-arylmaleimides in C–H bond addition and/or alternating copolymerization are described. While inactive to cross-linking when treated at high temperature with peroxide alone, these co-curing elastomers can be cross-linked substantially when combined with bismaleimide coagents such as N,N′-m-phenylenedimaleimide (BMI). Poly(isobutylene-co-isoprene) (IIR) samples containing relatively high amounts of residual isoprene unsaturation are shown to provide relatively low coagent cure reactivity, whereas IIR derivatives bearing pendant polyether or vinyl ether functionality are shown to provide exceptional cross-linking rates and extents when treated with identical BMI formulations. The design of such co-curing elastomers is discussed, along with the physical properties of the resulting vulcanizates. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300795b

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Phase-transfer catalyzed esterification of brominated poly(isobutylene-co-isoprene) / J. Keith McLean in Industrial & engineering chemistry research, Vol. 48 N° 24 (Décembre 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10759–10764 Titre : Phase-transfer catalyzed esterification of brominated poly(isobutylene-co-isoprene) Type de document : texte imprimé Auteurs : J. Keith McLean, Auteur ; Sergio A. Guillén-Castellanos, Auteur ; J. Scott Parent, Auteur Année de publication : 2010 Article en page(s) : pp. 10759–10764 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Brominated poly(isobutylene-co-isoprene) Carboxylate nucleophiles Phase-transfer techniques Résumé : Phase-transfer techniques are used to activate carboxylate nucleophiles for the purpose of preparing ester derivatives of brominated poly(isobutylene-co-isoprene) (BIIR). Studies of the dynamics and yields of stearate ester syntheses reveal the dual role of tetrabutylammonium bromide, as it serves as a phase-transfer catalyst and a catalyst for the isomerization of exomethylene allylic bromide functionality to kinetically more reactive E,Z-BrMe isomers. Knowledge of reaction fundamentals are used to prepare copolymers from BIIR and carboxylate-terminated polybutadiene (cBR) that phase-partition in the manner required for blend compatibilization applications. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901284j [article] Phase-transfer catalyzed esterification of brominated poly(isobutylene-co-isoprene) [texte imprimé] / J. Keith McLean, Auteur ; Sergio A. Guillén-Castellanos, Auteur ; J. Scott Parent, Auteur . - 2010 . - pp. 10759–10764. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10759–10764 Mots-clés : Brominated poly(isobutylene-co-isoprene) Carboxylate nucleophiles Phase-transfer techniques Résumé : Phase-transfer techniques are used to activate carboxylate nucleophiles for the purpose of preparing ester derivatives of brominated poly(isobutylene-co-isoprene) (BIIR). Studies of the dynamics and yields of stearate ester syntheses reveal the dual role of tetrabutylammonium bromide, as it serves as a phase-transfer catalyst and a catalyst for the isomerization of exomethylene allylic bromide functionality to kinetically more reactive E,Z-BrMe isomers. Knowledge of reaction fundamentals are used to prepare copolymers from BIIR and carboxylate-terminated polybutadiene (cBR) that phase-partition in the manner required for blend compatibilization applications. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901284j

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Phase-transfer catalyzed esterification of brominated poly(isobutylene-coisoprene) / J. Keith McLean in Industrial & engineering chemistry research, Vol. 48 N° 24 (Décembre 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10759–10764 Titre : Phase-transfer catalyzed esterification of brominated poly(isobutylene-coisoprene) Type de document : texte imprimé Auteurs : J. Keith McLean, Auteur ; Sergio A. Guillén-Castellanos, Auteur ; J. Scott Parent, Auteur Année de publication : 2010 Article en page(s) : pp. 10759–10764 Note générale : Industrial chelistry Langues : Anglais (eng) Mots-clés : Phase-Transfer--Catalyzed--Esterification--Brominated--Poly--(Isobutylene-co-Isoprene) Résumé : Phase-transfer techniques are used to activate carboxylate nucleophiles for the purpose of preparing ester derivatives of brominated poly(isobutylene-co-isoprene) (BIIR). Studies of the dynamics and yields of stearate ester syntheses reveal the dual role of tetrabutylammonium bromide, as it serves as a phase-transfer catalyst and a catalyst for the isomerization of exomethylene allylic bromide functionality to kinetically more reactive E,Z-BrMe isomers. Knowledge of reaction fundamentals are used to prepare copolymers from BIIR and carboxylate-terminated polybutadiene (cBR) that phase-partition in the manner required for blend compatibilization applications. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901284j [article] Phase-transfer catalyzed esterification of brominated poly(isobutylene-coisoprene) [texte imprimé] / J. Keith McLean, Auteur ; Sergio A. Guillén-Castellanos, Auteur ; J. Scott Parent, Auteur . - 2010 . - pp. 10759–10764. Industrial chelistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10759–10764 Mots-clés : Phase-Transfer--Catalyzed--Esterification--Brominated--Poly--(Isobutylene-co-Isoprene) Résumé : Phase-transfer techniques are used to activate carboxylate nucleophiles for the purpose of preparing ester derivatives of brominated poly(isobutylene-co-isoprene) (BIIR). Studies of the dynamics and yields of stearate ester syntheses reveal the dual role of tetrabutylammonium bromide, as it serves as a phase-transfer catalyst and a catalyst for the isomerization of exomethylene allylic bromide functionality to kinetically more reactive E,Z-BrMe isomers. Knowledge of reaction fundamentals are used to prepare copolymers from BIIR and carboxylate-terminated polybutadiene (cBR) that phase-partition in the manner required for blend compatibilization applications. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901284j

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