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Complex‐radical alternating copolymerization of trans ‐stilbene with N ‐substituted maleimides
Author(s) -
Rzaev Zakir M. O.,
Milli Hakan,
Akovali Güneri
Publication year - 1996
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199611)41:3<259::aid-pi591>3.0.co;2-9
Subject(s) - copolymer , maleimide , substituent , polymer chemistry , differential scanning calorimetry , thermogravimetric analysis , monomer , glass transition , imide , thermal stability , chemistry , materials science , stereochemistry , polymer , organic chemistry , physics , thermodynamics
Radical copolymerization of donor–acceptor monomers, i.e. trans ‐stilbene (Stb) with N ‐maleimide (MI), N ‐ethylmaleimide (EtMI) and N ‐phenylmaleimide (PhMI), are studied. Constants of charge‐transfer complex formation ( K c ) and copolymerization ( r 1 and r 2 ) are determined by Hanna–Ashbaugh ( 1 H nuclear magnetic resonance) and Kelen–Tüdöş methods, respectively. The results obtained were analysed by use of the complex copolymerization model of Seiner–Litt. It is found that the tendency for complex formation and the tendency for alternation of monomers depend on the nature of the N ‐substituent in the maleimide molecule. K c is found to increase in the order EtMI < MI < PhMI, and the tendency for alternation ( r 1 · r 2 ) decreases in the order MI > EtMI > PhMI. It is shown by thermogravimetric analysis, differential thermal analysis and differential scanning calorimetry that the alternating copolymers synthesized have high thermostabilities. The copolymers synthesized show increased thermal stabilities, as well as glass transition temperatures, with the change of imide N ‐substituent. Stb–MI, Stb–EtMI and Stb–PhMI copolymers decompose through a one‐step reaction at 456, 460 and 468°C, respectively.