STUDIES ON THERMAL TRANSITIONS OF SEGMENTED POLYESTER POLYURETHANEUREA ELASTOMERS

GUO Xiao-zhan; ZHAO Gen-suo; ZHANG Huang-li

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STUDIES ON THERMAL TRANSITIONS OF SEGMENTED POLYESTER POLYURETHANEUREA ELASTOMERS

Research Article | 更新时间：2021-03-19

- STUDIES ON THERMAL TRANSITIONS OF SEGMENTED POLYESTER POLYURETHANEUREA ELASTOMERS
- Acta Polymerica Sinica Issue 6, Pages: 670-675(1992)
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- Published：20 December 1992，
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GUO Xiao-zhan, ZHAO Gen-suo, ZHANG Huang-li. STUDIES ON THERMAL TRANSITIONS OF SEGMENTED POLYESTER POLYURETHANEUREA ELASTOMERS. [J]. Acta Polymerica Sinica (6):670-675(1992)
DOI：

GUO Xiao-zhan, ZHAO Gen-suo, ZHANG Huang-li. STUDIES ON THERMAL TRANSITIONS OF SEGMENTED POLYESTER POLYURETHANEUREA ELASTOMERS. [J]. Acta Polymerica Sinica (6):670-675(1992) DOI：

摘要

用示差扫描量热法(DSC)研究了基于二苯基甲烷二异氰酸酯(MDI)、乙二胺(ED)和聚己二酸丁二醇酯(PBA)(M.W.1975和M.W.1228)两系列嵌段聚酯型聚脲氨酯(PUU)弹性体

并考察了这些材料在不同退火条件下软段结晶的热变化。结果表明:在这些弹性体中

PBA 1975系列具有比PBA1228系列更低的软段玻璃化温度

说明前者的相分离较好.软段Tgs和硬段Tgh对硬段含量的变化不敏感.退火样品的DSC结果表明:软段结晶具有两个吸热峰

提出在软段相中存在两种晶型(Pl和Ph)的假设

分析了两种晶型产生的原因.

Abstract

Studies on two series of segmented polyester polyurethaneurea (PUU) elastomers based on 4

4-diphenylmethane diisocyanate(MDI)

ethylene diamine(ED) and polybutylene adipate (PBA)(M. W. 1975 and M. W. 1228) were made by DSC. Further

thermal changes of soft segment crystalline of these materials at different annealing conditions were also investigated. The results showed that in both series

PBA 1975 series had a lower T

of soft segment phase than PBA 1228 series

indicating that the phase segregation of the former was better

Both the soft segment Tgs and the hard segment Tgh were not sensitive to the changes of the hard segment contents in the samples. The results on the annealed samples showed that soft segment crystal-line melting existed in two peaks. The hypothesis of the existence of two types of crystallines (P2 and Ph) in the soft segment phase was proposed

and the reason that these two types of crystallines formed was analyzed theoretically.

关键词

聚酯型聚脲氨酯软段硬段相分离

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