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Titolo:
A calorimetric study of the 4,4'-(N,N'-bismaleimide)diphenylmethane-2,2'-diallylbisphenol A system
Autore:
Rozenberg, BA; Dzhavadyan, EA; Morgan, RJ; Shin, EE;
Indirizzi:
Russian Acad Sci, Inst Problems Chem Phys, Chernogolovka 142432, Moscow Oblast, Russia Russian Acad Sci Chernogolovka Moscow Oblast Russia 142432 Oblast, Russia Michigan State Univ, Adv Mat Engn Expt Stn, Midland, MI 48640 USA MichiganState Univ Midland MI USA 48640 Expt Stn, Midland, MI 48640 USA
Titolo Testata:
POLYMER SCIENCE SERIES A
fascicolo: 4, volume: 43, anno: 2001,
pagine: 400 - 407
SICI:
0965-545X(200104)43:4<400:ACSOT4>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
DI-FUNCTIONAL ALLYLPHENOLS; BIS(MALEIMIDE)/DIALLYLBISPHENOL-A RESIN; BISMALEIMIDE RESINS; CURING REACTIONS; CURE; SPECTROSCOPY; FLUORESCENCE; PRODUCTS; MONO;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
14
Recensione:
Indirizzi per estratti:
Indirizzo: Rozenberg, BA Russian Acad Sci, Inst Problems Chem Phys, Chernogolovka 142432, Moscow Oblast, Russia Russian Acad Sci Chernogolovka Moscow Oblast Russia 142432
Citazione:
B.A. Rozenberg et al., "A calorimetric study of the 4,4'-(N,N'-bismaleimide)diphenylmethane-2,2'-diallylbisphenol A system", POLYM SCI A, 43(4), 2001, pp. 400-407

Abstract

The kinetics of thermal cure of the 4.4'-(N,N'-bismaleimide)diphenylmethane-2,2'-diallylbisphenol, a system and some model systems involving monofunctional compounds (N-phenylmaleimide and 2-allylphenol) at different component ratios were studied by the DSC and isothermal calorimetric techniques. It was shown that the cure process in the equifunctional system occurs in two temperature regions with maximum rates at 230-240 and 330-340 degreesC corresponding to two major reactions, the condensation of maleimide and allylgroups and the subsequent crosslinking by radical polymerization of the propenyl groups formed in the first step and unreacted allyl groups. The enthalpy of double bond opening of the maleimide group in its condensation reaction with the allyl group and in the polymerization is equal to 92 kJ/mol for both reactions. It was found that the competing reaction in the first step is the homopolymerization of maleimide groups, which occurs in the autocatalytic mode and is initiated by the free radicals produced by thermal degradation of the maleimide group-propenyl group donor-acceptor pair. The role of this reaction increases with increasing the excess of maleimide over allyl groups in the initial mixture and decreases with increasing the reaction temperature. The elevation of temperature increases the contribution of thermally induced homopolymerization of maleimide groups. The reaction kinetics in the range 140-200 degreesC were shown to be described well with allowance for competition between the aforementioned reactions. The reaction rate parameters were: determined for all of the systems examined.

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Documento generato il 24/09/20 alle ore 02:33:16