STUDIES ON THE SPHERULITE FORMATION IN MELT CAST POLYCAPROLACTONE BASED POLYURETHANES

MA Dezhu; MAO Runsheng; LUO Xiaolie; XU Mao

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STUDIES ON THE SPHERULITE FORMATION IN MELT CAST POLYCAPROLACTONE BASED POLYURETHANES

Papers | Updated：2021-06-21

- STUDIES ON THE SPHERULITE FORMATION IN MELT CAST POLYCAPROLACTONE BASED POLYURETHANES
- Vol. 8, Issue 4, Pages: 353-358(1990)
- Affiliations：
  
  1. Department of Material Science, University of Science and Technology of China, Hefei, Anhui 230026) XU Mao
  2.   University of Science and Technology of China
  3.   Polymer Physics Laboratory. Institute of Chemistry. Academia Sinica Hefei
  4.   Anhui 230026
  5.   Beijing 100080
- Author bio：
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MA Dezhu, MAO Runsheng, LUO Xiaolie, et al. STUDIES ON THE SPHERULITE FORMATION IN MELT CAST POLYCAPROLACTONE BASED POLYURETHANES. [J]. 8(4):353-358(1990)
DOI：

MA Dezhu, MAO Runsheng, LUO Xiaolie, et al. STUDIES ON THE SPHERULITE FORMATION IN MELT CAST POLYCAPROLACTONE BASED POLYURETHANES. [J]. 8(4):353-358(1990) DOI：

摘要

<正> 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 soft segments and the interactions between hard segments themselves. PCL soft segments of molecular weight 1500 is still crystallizable and may form different crystalline superstructures.

Abstract

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 soft 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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