RELATIONSHIP BETWEEN GLASS TRANSITION TEMPERA TURE AND MOLECULAR PARAMETERS OF POLYMERS

LU Xin-ya; JIANG Bing-zheng

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RELATIONSHIP BETWEEN GLASS TRANSITION TEMPERA TURE AND MOLECULAR PARAMETERS OF POLYMERS

Research Article | 更新时间：2021-03-19

- RELATIONSHIP BETWEEN GLASS TRANSITION TEMPERA TURE AND MOLECULAR PARAMETERS OF POLYMERS
- Acta Polymerica Sinica Issue 6, Pages: 647-654(1990)
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- Published：20 December 1990，
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LU Xin-ya, JIANG Bing-zheng. RELATIONSHIP BETWEEN GLASS TRANSITION TEMPERA TURE AND MOLECULAR PARAMETERS OF POLYMERS. [J]. Acta Polymerica Sinica (6):647-654(1990)
DOI：

LU Xin-ya, JIANG Bing-zheng. RELATIONSHIP BETWEEN GLASS TRANSITION TEMPERA TURE AND MOLECULAR PARAMETERS OF POLYMERS. [J]. Acta Polymerica Sinica (6):647-654(1990) DOI：

摘要

本文研究了聚甲基丙烯酸甲酯(PMAA)的立构规整性与T8的关系

结果表明立构单元分布和含量均对T8有显著影响。应用前文导出的理论关系

进一步处理了T8和构象参数实验数据

用这种简单方法计算得的无扰尺寸温度系数和实验值一致。由此推论

不同立构PMMA链的T8之差反映了它们局部择优链构象的不同。

Abstract

The glass transition temperature (Tg) and unperturbed demensions of PMMAs with Bernoulli distribution of stereoregular diads were measured. It was found that T

of PMMA depends not only on their tacticity but also on the distfibution type of the diads. Therefore

the linearized equation representing the dependence of Tg on the content of iso-

syndic- and heterotriads can only be used for the PMMA with the same type of stereodiads distribution.The theoretical relationship proposed in our previous papei; was applied to analyse the data of Tg and unperturbed dimension for PMMAs having various tacticities. The temperature coefficients

dlnσ2/dT

calculated by this method show a good agreement with the experimental ones.

关键词

聚甲基丙烯酸甲酯立构规整性玻璃化温度链构象无扰尺寸

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Institute of Polymer Science,School of Chemistry and Chemical Engineering Zhongshan University

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