Citation: MA Dezhu, MAO Runsheng, LUO Xiaolie, XU Mao. STUDIES ON THE SPHERULITE FORMATION IN MELT CAST POLYCAPROLACTONE BASED POLYURETHANES[J]. Chinese Journal of Polymer Science, ;1990, 8(4): 353-358. shu

STUDIES ON THE SPHERULITE FORMATION IN MELT CAST POLYCAPROLACTONE BASED POLYURETHANES

Received Date: 7 November 1989

A series of PCL/MDI/BDO segmented polyurethanes have been synthesized by two-step method in solution.The hard segment content ranges from 10% to 48% by weight, and the molecular weight of PCL diols is 1500. Hard segment spherulites have been observed in compression molded specimens of all of the samples except the one of the lowest hard segment content. The difficulty in sphernlite formation was explained as only in a small temperature range,the microphase separation rate may be faster than the crystallization rate and all these processes are very slow due to the hydrogen bonding between hard and solf segments and the interactions between hard segments themselves.PCL soft segments of molecular weight 1500 is still crystallizable and may form different crystalline superstructures.
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