Presented at Polymer 91 International Symposium, Melbourne, 10–15 February, 1991.
Synthesis and characterization of poly(siloxane-urethane)s†
Article first published online: 26 FEB 2007
Copyright © 1992 Society of Chemical Industry
Volume 27, Issue 2, pages 177–185, 1992
How to Cite
Chun, Y.-C., Kim, K.-S., Shin, J.-S. and Kim, K.-H. (1992), Synthesis and characterization of poly(siloxane-urethane)s. Polym. Int., 27: 177–185. doi: 10.1002/pi.4990270212
- Issue published online: 26 FEB 2007
- Article first published online: 26 FEB 2007
- Manuscript Accepted: 14 MAY 1991
- Manuscript Received: 5 APR 1991
- block copolymer;
- mechanical properties;
- thermal properties;
A series of polyurethane block copolymers based on hydroxy-terminated polydimethylsiloxane and poly(propylene glycol) soft segments of molecular weights 1818 and 2000, respectively, were synthesized. The hard segments consisted of 4,4′-diphenylnethane diisocyanate and 1,4-butanediol as the chain extender. Samples with different molar ratios were prepared. We tried to synthesize polydimethylsiloxane-based polyurethanes (PDMS-PU) containing a hard block as major fraction and a soft block as minor fraction for preparing toughened rigid systems. After a study of the pure polydimethylsiloxane-based polyurethane and poly(propylene glycol)-based polyurethane (PPG-PU), (mixed polyol)-based block copolymers and blends of PDMS-PU and PPG-PU were synthesized, and characterized by means of differential scanning calorimetry, tensile testing and scanning electron microscopy. In (mixed polyol)-based copolymers and lower hard-segment content blends, macro-phase separation occurred, but blends with higher hard-segment contents showed significant reduction in amounts of phase separation.