Abstract
ABSTRACTPolyurethanes containing polycaprolactone diol or poly(tetramethylene ether)glycol as a soft segment and 4,4′-methylenebis(phenyl isocyanate) as a hard segment were used as a polymer frame. Polydimethylsiloxane was grafted onto polyurethanes to reduce the molecular interactions and to improve the mobility of polyurethanes, and the plasticizing groups, n-butyl and 2-ethylhexyl, were attached to polyurethanes by graft polymerization. With an increase in the polydimethylsiloxane content, the Tg of the polydimethylsiloxane–polyurethanes gradually increased, whereas the Tg of the n-butyl and 2-ethylhexyl-attached polyurethanes was not affected by a change in their composition. The polydimethylsiloxane-grafted polyurethanes demonstrated excellent tensile strength, shape recovery, and low-temperature flexibility.
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