无规聚甲基丙烯酸甲酯立构复合的红外光谱研究

Formation of Stereocomplexes in Atactic Poly(methyl methacrylate) St udied by FTIR

用红外光谱研究了无规聚甲基丙烯酸甲酯的丙酮、苯、氯仿溶液成膜样品的立构复合状况。结果表明无规聚甲基丙烯酸甲酯在丙酮和苯中确能形成立构复合结构 ,结构的形成主要是依靠分子链中间规和等规链段的相互作用。对丙酮样品的退火实验表明 ,在退火过程中能够发生间规链段的自聚集现象。

The stereocomplexation of atactic poly(methyl me thacrylate) (a-PMMA) films after isolated from acetone,benzene,and chlorofo rm solution,respectively,was studied by Fourier transformation infrared (FTIR). The results of spectra showed that the stereocomplex was formed for the films ca st 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 sam e molecular chain.During the annealing process the self-aggregation of s-seque nces played a role in the aggregation process of stereocomplex,which was a funct ion of annealing temperature and annealing time.