Abstract

Based on the data of low-frequency (terahertz) IR and Raman spectroscopies, it is established that low-energy vibrational excitations in PMMA and its oligomers with a degree of polymerization n = 2, 7, 9, and 50 are due to correlated small-angle torsional–vibrational dynamics, which prepares the relaxational mobility of macromolecules. The minimum size of the chain segment (“torsional–vibrational segment”), the spectrum of which is identical to the spectrum of the high-molecular polymer, is determined.

中文翻译：

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太赫兹红外光谱和拉曼光谱研究聚甲基丙烯酸甲酯及其短链低聚物的低能过程

摘要

根据低频（太赫兹）IR和拉曼光谱数据，可以确定聚合度为n = 2、7、9和50的PMMA及其低聚物中的低能振动激发是由于相关的小角扭转-振动动力学，它为大分子准备了弛豫运动性。确定了链段的最小尺寸（“扭转振动段”），其光谱与高分子聚合物的光谱相同。