S. Amou et al., COPOLYMERIZATION OF N-(4-VINYLPHENYL)MALE IMIDE WITH STYRENE AND N-PHENYLMALEIMIDE AND THERMAL-PROPERTIES OF THE COPOLYMERS, Kobunshi ronbunshu, 51(12), 1994, pp. 764-770
In order to synthesize linear polymers with crosslinkable pendant unsa
turated groups, copolymerizations of N-(4-vinylphenyl)maleimide (VPMI)
with N-phenylmaleimide (PMI) and styrene (St) were carried out. VPMI
possesses two polymerizable carbon-carbon double bonds with different
reactivities. Poly(VPMI-co-PMI)MI obtained by anionic copolymerization
with potassium tert-butoxide as an initiator had both VPMI and PMI un
its, and the VPMI unit possessed a pendant styrene group. Poly(VPMI-co
-St)St obtained by cationic copolymerization initiated by trifluorobor
on etherate had both VPMI with a pendant maleimide group and St units.
Thermal properties of the copolymers were examined by DSC and TGA. Ev
ery poly(VPMI-co-PMI)MI had no obvious melting point. Thermal decompos
ition temperatures of these copolymers were 411 approximately 434-degr
ees-C, which were not influenced by the composition. Poly(VPMI-co-St)S
t which contained more than 60 mol% St unit showed a melting point. Th
e thermal decomposition temperature of poly(VPMI-co-St)St decreased wi
th increasing content of St unit. Poly(VPMI-co-St)St decomposed at 384
approximately 461-degrees-C. The decomposition temperatures of these
copolymers were higher than that of polystyrene.