Structural changes in ferroelectric phase transitions of vinylidene fluoride-tetrafluoroethylene copolymers: 2. Normal-modes analysis of the infra-red and Raman spectra at room temperature
Structural changes in ferroelectric phase transitions of vinylidene fluoride-tetrafluoroethylene copolymers: 2. Normal-modes analysis of the infra-red and Raman spectra at room temperature
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偏二氟乙烯-四氟乙烯共聚物铁电相变的结构变化：2.室温红外和拉曼光谱的简正模分析
DOI：
10.1016/0032-3861(92)90078-b
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发表时间：
1992
期刊：
影响因子：
4.6
通讯作者：
Masamichi Kobayashi
中科院分区：
文献类型：
--
作者：
K. Tashiro;H. Kaito;Masamichi Kobayashi
对偏氟乙烯-四氟乙烯(VDF-TFE)共聚物的一系列模型高分子链进行了简正波计算，解释了红外光谱和拉曼光谱的系统变化。模型链为[-(Vdf)m(TFe)n-]交替共聚物，其中m n=∞0，8 2，5 5，2∞和0∞。利用这些模型链的简正波频率和相应的本征向量，构造了频率-相位差色散曲线和态密度(或频率分布函数)。在此基础上，对VDF序列、TFE序列和VDF-TFE界面的本征能带进行了归属，并解释了室温下观察到的红外光谱和拉曼光谱的变化。
Normal-modes calculation was made for a series of model polymer chains of vinylidene fluoride-tetrafluoroethylene (VDF-TFE) copolymers so as to interpret the systematic variation in the ir and Raman spectra. The model chains are alternating copolymers of [-(VDF) m (TFE) n-] with m n=∞ 0, 8 2, 5 5, 2∞ and 0∞. Utilizing the normal-modes frequencies and the corresponding eigenvectors calculated for these model chains, the frequency-phase difference dispersion curves and the density of state (or the frequency distribution function) were constructed. Based on these results, the assignments of the intrinsic bands of the VDF sequence, TFE sequence and VDF-TFE boundary were made and the changes in the ir and Raman spectra observed at room temperature were interpreted.