AB crosslinked polymers based on cationomeric polyurethane and poly(methylmethacrylate): static and dynamic mechanical studies

Vinyl-terminated polyurethane (VTPU) was prepared by end-functionalizing is ocyanate-terminated prepolymers with 2-bromoethanol and subsequently quarte nizing with 4-vinylpyridine. The vinyl functionality was then effectively u tilized for preparing AB crosslinked polymers (ABCPs) with methyl methacryl ate (MMA). ABCPs prepared with variable weight ratios on PTMG(1000)-based V TPU/MMA (8/2, 6/4, 5/5, 4/6, 2/8) and those prepared at a 5/5 weight ratio with different polyols (PTMG(1000), PPG(1000), and PCL1250) in VTPU were ch aracterized by Fourier transform infrared spectroscopy (FTIR) and further a nalyzed for thermal and mechanical properties. FTIR spectral results confir m quartenization of heterocyclic nitrogen, leading to crosslinking. Thermog ravimetric analyses show enhanced thermal stability of the crosslinked syst ems. The stress-strain measurements reveal increasing tensile strength with increasing amounts of MMA. Comparison of dynamic mechanical spectra of ABC Ps based on PTMG(1000) shows that the 5/5 composition exhibits good damping over a broad temperature range. (C) 2001 John Wiley & Sons, Inc.