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本文研究了聚甲基丙烯酸甲酯(PMAA)的立构规整性与T_8的关系,结果表明立构单元分布和含量均对T_8有显著影响。应用前文导出的理论关系,进一步处理了T_8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T_8之差反映了它们局部择优链构象的不同。
In this paper, the relationship between the stereoregularity of polymethylmethacrylate (PMAA) and T_8 was studied. The results showed that both the distribution and the content of stereocenters had a significant effect on T_8. The experimental data of T_8 and conformational parameters were further processed by using the theoretical relationship derived from the previous article. The temperature coefficient of undisturbed dimension calculated by this simple method is consistent with the experimental value. It can be inferred that the difference of T_8 between different stereostructured PMMA chains reflects the difference of their local preferential chain conformations.