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http://dx.doi.org/10.7317/pk.2014.38.5.602

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

Ra, Sang Hee (Department of Organic Materials and Fiber Engineering, Soongsil University)
Kim, Young Ho (Department of Organic Materials and Fiber Engineering, Soongsil University)
Publication Information
Polymer(Korea) / v.38, no.5, 2014 , pp. 602-612 More about this Journal
Abstract
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.
Keywords
shape memory polyurethane; poly(dimethyl siloxane); thermal property; shape retention; shape recovery;
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