Relationship Between the Molecular Dynamics of Polystyrene and Its Modifications and Parameters of Poley Absorption in Far-infrared Spectra
Relationship Between the Molecular Dynamics of Polystyrene and Its Modifications and Parameters of Poley Absorption in Far-infrared Spectra
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聚苯乙烯分子动力学与其改性及远红外光谱多极吸收参数的关系
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
V. Ryzhov
中科院分区：
文献类型：
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作者：
V. Ryzhov
聚苯乙烯（PS）及其通过甲基、氯和/或溴原子取代苯环上的氢原子而得到的改性，在20 ~ 450 cm−1的频率范围内测量了远红外光谱。所有这些光谱都表现出异常宽的不对称吸收带，根据取代基的性质，最大吸收带的位置在40到80 cm−1之间，这可以归因于与单体单元苯基环的振动（旋转振动）相关的吸收，即通过Poley机制发生的吸收。poly吸收光谱参数与所研究聚合物分子特性之间的关系使得直接分析分子结构和分子间力在大分子动力学中的作用成为可能。根据对这种吸收的分析估计，振动单体单元的势垒高度QL接近于。
The far-infrared spectra of polystyrene (PS) and its modifications, obtained by methyl group, chlorine and/or bromine atom substitutions for hydrogen atoms in the benzene ring, was measured in the frequency range from 20 to 450 cm−1. All these spectra exhibited abnormally broad asymmetric absorption bands with the position of maximum in the range from 40 to 80 cm−1, depending on the nature of the substituent, which can be assigned to the absorption associated with libration (rotational vibrations) of the phenyl ring of the monomer units, i.e., to the absorption occurring through the Poley mechanism. The relationship between the spectral parameters of the Poley absorption and the molecular characteristics of the studied polymers make it possible to directly analyze the role of molecular structure and intermolecular forces in the dynamics of macromolecules. The heights of the potential barriers of the librating monomer units, QL , estimated based on analysis of this absorption, were found to be close to the...