Study of the orientational relaxation dynamics in a nonlinear optical copolymer by means of a pole and probe technique
Study of the orientational relaxation dynamics in a nonlinear optical copolymer by means of a pole and probe technique
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利用极探针技术研究非线性光学共聚物中的取向弛豫动力学
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
J. Zyss
中科院分区：
文献类型：
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作者：
F. Michelotti;E. Toussaere;R. Levenson;J. Liang;J. Zyss
我们报告的电场极化聚合物薄膜的电光系数的等温弛豫动力学的测量。所研究的共聚物是侧链分散红1/聚甲基丙烯酸甲酯组合。等温弛豫示出遵循Kohlrausch-Williams-Watts拉伸指数依赖，其参数强烈依赖于温度。的平均衰减常数示出以下的玻璃化转变Tg的Arrhenius温度依赖性，而它是由Vogel-Fulcher-Tamann-Hesse的Tg以上。衰减常数的值证实了聚合物取向相对于客体-主体系统的更好的稳定性。弛豫被证明是由于弛豫速率的广泛分布，其宽度可以定性地描述的经验关系，这已经被用于客体-主体系统。测量技术允许监测在一个标准的介电弛豫配置和执行弛豫…
We report measurements on the isothermal relaxation dynamics of the electro‐optic coefficient of electric field poled polymeric films. The studied copolymer is a side‐chain Disperse Red 1/poly–methyl–metacrylate combination. The isothermal relaxation is shown to follow a Kohlrausch–Williams–Watts stretched exponential dependence, whose parameters are strongly dependent on temperature. The average decay constant is shown to follow an Arrhenius temperature dependence below the glass transition Tg, while it is described by a Vogel–Fulcher–Tamann–Hesse above Tg. The values of the decay constant confirm a much better stability of the polymer orientation with respect to guest‐host systems. The relaxation is shown to be due to a broad distribution of relaxation rates, the width of which can be qualitatively described by an empirical relation, which has already been used for guest‐host systems. The measurement technique permits monitoring relaxation in a standard dielectric relaxation configuration and performing...