...
首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Study of Molecular Dynamics in Poly(n-alkyl methacrylates) by Light Induced Absorption Anisotropy
【24h】

Study of Molecular Dynamics in Poly(n-alkyl methacrylates) by Light Induced Absorption Anisotropy

机译:诱导光吸收各向异性研究聚甲基丙烯酸正丁酯的分子动力学

获取原文
获取原文并翻译 | 示例
           

摘要

Formation of absorbance anisotropy under linearly polarized irradiation at 405 nm in films of poly(ethyl methacrylate) (PEMA), poly(n-butyl methacrylate) (PnBMA), and poIy(n-hexyl methacrylate) (PnHexMA) doped with azo compound has been studied in a wide temperature range below T_g. The anisotropy formation kinetics has been well described under the assumption that there are two types of environments in the polymer matrixes: mobile and immobile. The mobile environment allows the dopant to reorient in the course of cis—trans—cis isomerization cycle and the immobile environment does not. The fraction of mobile environments was estimated to be 0.12 in PEMA, 0.65 in PnBMA, and 1.0 in PnHexMA. An increase in the fraction of mobile environments within the series PEMA—PnBMA—PnHexMA have been associated with an increase in the size of alkyl nahodomains. The average angle of transition dipole rotation upon isomerization and the amplitude of molecules librations have been estimated in the temperature range studied.
机译:掺有偶氮化合物的聚(甲基丙烯酸乙酯)(PEMA),聚(甲基丙烯酸正丁酯)(PnBMA)和聚(甲基丙烯酸正己酯)(PnHexMA)膜在405 nm的线偏振辐射下形成吸收各向异性在低于T_g的较宽温度范围内进行了研究。在聚合物基质中存在两种类型的环境的假设下,已经很好地描述了各向异性的形成动力学:可移动和不可移动。移动环境允许掺杂剂在顺-反-顺式异构化过程中进行重定向,而固定环境则不允许。在PEMA中,移动环境的比例估计为0.12,在PnBMA中为0.65,在PnHexMA中为1.0。 PEMA-PnBMA-PnHexMA系列中移动环境所占比例的增加与烷基nahodomains大小的增加有关。在研究的温度范围内,已估算出异构化时过渡偶极子旋转的平均角度和分子释放的幅度。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号