Chain extension and crosslinking of telechelic oligomers—I. Michael additions of bisamines to bismaleimides and bis(acetylene ketone)s

Effects of initial composition and temperature on the kinetics of polymerizations of N,N′-bismaleimide-4,4′-diphenylmethane with barbituric acid

“…The total fractional conversion of -C=C-of BMI at time t (X t ) and the fractional conversion of active hydrogen atoms of >CH 2 time t (X B CH ) are defined as follows:…”

“…Some representative studies on the mechanisms involved in the polymerization of BMI with BTA are briefly described as follows. BMI with two reactive terminal -C=C-of bismaleimide groups can polymerize with active hydrogen atom-containing species such as polyamines via Michael addition reaction mechanism [2][3][4][5][6][7]. Another mechanism that cannot be ruled out is free radical polymerization of BMI initiated by initiator such as 2,2 -azobisisobutyronitrile (AIBN) [8,9] or BTA [9][10][11].…”

Synthesis and Characterization of Poly(Maleimide-Ethers) from the Reaction of Bisdichloromaleimides with 4,4′-(Hexafluoroisopropylidene)diphenol

“…The aromatic bismaleimides (I) used in the reaction were prepared from aromatic diamines (1 mol) with nialeic anhydride ( 2 mol) in dry acetone at reflux temperature under a nitrogen atmosphere according to a method described in the literature [9] (Scheme 1). Intermediate bismaleamic acid was cyclodehydratated in siru with acetic anhydride, triethylamine using magnesium acetate as a catalyst.…”

Thermal Characterization of Polyaminobismaleimide Prepolymers

“…The structure of the polymer thus results from reactions of addition of low-molar-mass, soluble, and meltable prepolymers that are transformed into a three-dimensional, cross-linked and unmeltable system by a heat treatment. The diamine comonomer, a nucleophilic agent, then reacts on reactive maleimide functions via a Michael addition reaction (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16) at the same time as allowing chain elongation that depends on the stoichiometry chosen. The homopolymerization reaction of residual maleimide groups can then occur by simply raising the temperature.…”