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利用透射椭偏技术测量了光折变聚合物PVK∶5CB∶C60中生色团5CB(4,4′-n-pentylcyanobiphenyl)的动态取向过程.当温度远高于系统的玻璃转化温度时,在很低的外加电场下就可观察到生色团5CB取向振动过程.振动频率与外加电场的大小有关.并且生色团的稳态取向分布是温度的函数.就我们所知,目前的理论模型还无法对这些现象给出合理的解释.(PH9) 相似文献
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Under the background of college entrance examination reform, it becomes imperative to improve the students' interest in chemistry. During the effort to investigate how to present the chemistry knowledge, to cultivate and promote students' interest and professional attitude towards chemistry, we developed the public science education laboratory of College of Chemistry and Materials Science, Northwest University. In the current paper, we introduced the background of setting-up, the missions and targets of the laboratory, as well discussed the construction, evaluation systems and prospection of the laboratory. 相似文献
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考虑到聚合物基体对生色团的取向的阻尼作用 ,以及外电场对生色团的极化作用 ,在已有的生色团气体取向模型基础上 ,建立了非气体取向模型 .并利用数值计算方法求解了这一非气体取向模型方程 .讨论了外加电场、温度对生色团取向的动态过程和稳态分布的影响 ,比较了两模型的计算结果 .采用椭圆偏振法 ,测量了光折变聚合物PVK∶5CB∶C60 中的生色团 5CB在聚合物基体PVK中动态取向过程 .给出了生色团的稳态和动态取向参量随外加电场和温度的变化关系 .理论与实验的比较 ,进一步证明了非气体取向模型的合理性 相似文献
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Influence of intensity on the steady and transient state space—charge fields in photorefractive polymers
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We have proven theoretically that there are sublinear,linear and superlinear relations between the response rates and total incident intensity for different cases of traps in photorefractive polymer materials.These relations were observed in inorganic photorefractive crystals many years ago.Also,the steady-state space-charge field is a function of the total incident intensity,which has also been found in inorganic photorefractive crystals.We have measured the relations of the steady-state diffraction efficiency and the response rate with respect to the total incident intensity in the photorefractive composite consisting of the polymer (N-vinylcarbazole) (PVK) doped with 4,4‘-n-pentylcyanobiphenyl (5CB) and C60.The results obtained show that the composite belongs to the case of low trap density. 相似文献
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考虑到聚合物基体对生色团的取向的阻尼作用,以及外电场对生色团的极化作用,在已有的生色团气体取向模型基础上, 建立了非气体取向模型.并利用数值计算方法求解了这一非气体取向模型方程.讨论了外加电场、温度对生色团取向的动态过程和稳态分布的影响,比较了两模型的计算结果.采用椭圆偏振法,测量了光折变聚合物PVK∶5CB∶C60中的生色团5CB在聚合物基体PVK中动态取向过程.给出了生色团的稳态和动态取向参量随外加电场和温度的变化关系.理论与实验的比较,进一步证明了非气体取向模型的合理性. 相似文献