Thermoplastic polyurethane elastomers (TPUs) from diol-terminated poly(tetramethylene glycol) (PTMG), 1,4-butanediol (BD) and 4,4'-diphenylmethane diisocyanate (MDI) were modified by copolymerizing with diamine-terminated poly(7-methyl-L-glutamate) oligomer (7-PMG). In TPUs modified by the 7-PMG segment, the hard segment showed a decreased crystallinity and a melting point depression, as some of the hard segments were replaced by the 7-PMG segment. This behaviour is probably due to the strong interaction and phase mixing between ~,-PMG and hard segments. The melting behaviour of the PTMG segment suggested a weaker interaction between 7-PMG and PTMG segments compared with that between hard segments and PTMG segments. When a small amount of hard segments was replaced by 7-PMG segments, the modulus increased and the elongation at break decreased.
Посилання на статтю:
Synthesis and properties of thermoplastic polyurethane elastomers modified by poly(7-methyI-L-glutamate ) segment / Sang Beom Lee, Kwang Sik Yoo, Koo Sik Yoon and Han Mo Jeong // Polymer. – 1994. – Vol 35. – P. 3804-3806.