Gu Q, Shen D
State Key Laboratory of Polymer Physics and Chemistry, Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, 100080 Beijing.
Guang Pu Xue Yu Guang Pu Fen Xi. 2000 Oct;20(5):603-5.
The stereocomplexation of atactic poly(methyl methacrylate) (a-PMMA) films after isolated from acetone, benzene, and chloroform solution, respectively, was studied by Fourier transformation infrared (FTIR). The results of spectra showed that the stereocomplex was formed for the films cast from acetone and benzene solutions with the appearance of the characteristic bands for the stereocomplex. The population of trans-trans conformers for the i- and s-sequences increased and the side chain preferred to its energetically optimized conformation during the formation of stereocomplex. The stereocomplexes may be formed by the interactions between the i- and s-sequences in the same molecular chain. During the annealing process the self-aggregation of s-sequences played a role in the aggregation process of stereocomplex, which was a function of annealing temperature and annealing time.
分别从丙酮、苯和氯仿溶液中分离出的无规聚甲基丙烯酸甲酯（a-PMMA）薄膜的立体络合作用，通过傅里叶变换红外光谱（FTIR）进行了研究。光谱结果表明，从丙酮和苯溶液中浇铸的薄膜形成了立体络合物，出现了立体络合物的特征谱带。在立体络合物形成过程中，i-序列和s-序列的反-反构象体数量增加，侧链倾向于其能量优化构象。立体络合物可能是由同一分子链中的i-序列和s-序列之间的相互作用形成的。在退火过程中，s-序列的自聚集在立体络合物的聚集过程中起作用，这是退火温度和退火时间的函数。
