CRAFT-INTERPENETRATING POLYMER NETWORKS OF POLYURETHANE AND BISMALEIMIDE

Citation
Kh. Hsieh et al., CRAFT-INTERPENETRATING POLYMER NETWORKS OF POLYURETHANE AND BISMALEIMIDE, Journal of applied polymer science, 57(3), 1995, pp. 319-327
Citations number
25
Categorie Soggetti
Polymer Sciences
ISSN journal
00218995
Volume
57
Issue
3
Year of publication
1995
Pages
319 - 327
Database
ISI
SICI code
0021-8995(1995)57:3<319:CPNOPA>2.0.ZU;2-#
Abstract
Graft-interpenetrating polymer networks (graft-IPNs) of polyurethane ( PU) and bismaleimide (BMI) were prepared by using a simultaneous polym erization technique. The effects of the PU molecular weight and the am ounts of the PU on the mechanical properties, thermal stability, dynam ic mechanical properties, density, and morphology of the IPNs are disc ussed. The graft-IPNs exhibited superior ultimate tensile strength and large improvement in flexural strength when the short soft segments o f the PU were introduced. Better thermal stability of the IPNs was sho wn by increasing the BMI content. The heterogeneous and phase-separate d characteristics were found from the results of dynamic mechanical an alysis. The maximum density was achieved by the graft-IPNs structure w hen 33.3 wt % of PU with short soft chain length was added. The graft- IPNs also showed heterogeneous morphology in the micrographs when a la rge amount of PU was incorporated. (C) 1995 John Wiley & Sons, Inc.