Synthesis of Polyurethanes Containing Poly(dimethyl siloxane) and Their Thermal and Shape Memory Properties

초록

Polyurethanes containing poly(dimethyl siloxane) (PDMS) unit, PU-Si, were synthesized and their thermal and shape memory properties were investigated. Various amounts of PDMS units were incorporated via a solution polymerization method using mixed diols of poly(tetramethylene ether glycol) (PTMEG) and PDMS-diol as the soft segment (SS) and methylene diphenyl diisocyanate and 1,4-butanediol as the hard segment (HS). Two series of PU-Si samples with an HS content of 23% or 32% were prepared and analyzed. For PU-Si with an HS content of 23%, both the cold crystallization temperature (T-cc) and melt crystallization temperature of the SS domain moved higher temperature with increasing PDMS content, while the melting temperature (T-m) of the SS domain remained unaffected. The increase in HS content from 23% to 32% resulted in the increased T-m and disappearance of T-cc. The shape recovery of PU-Si flim with an HS content of 32% increased while its shape retention decreased as PDMS content increased.

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