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Basic Research and Development of Model Polymers for Optical Use with Low Birefringence

低双折射光学用模型聚合物的基础研究与开发

基本信息

批准号：
07455382
负责人：
OSAKI Kunihiro
金额：
$ 4.99万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07455382/
关键词：
Glassy polymers Birefringence Photoelasticity Glass transition Viscoelasticity 光弾性

项目摘要

In order to clarify the origin and the relaxation mechanism of strain-induced birefringence, we measured the dynamic viscoelasticity and the dynamic birefringence in oscillatory deformation for more than 30 polymeric materials. Systematic studies for a series of vinyl polymers revealed that the birefringence as well as the modulus are composed of two relaxational components ; one dominant at high temperatures and long times and the other at low temperatures and short times. An equation was derived to estimate the birefringence associated with two relaxation modes from the anisotropy of polarizability and the orientation of monomer units. By combining the theoretical expression and the observed results, a method was obtained to estimate the orientation function from the geometrical anisotropy of monomer unit and then to estimate the stress-optical coefficient from the molecular structure.According to the predicted relation between the degree of birefringence and molecular structure, a few polymers were synthesized. Some of the polyolefins including cyclic structures in the main chain were revealed to be low birefringent. Also hydrogenated polystirene was found to be low birefringent. It was suggested that mixtures of hydrogenated polystirene of different degrees of hydrogenation would be excellent materials in view of the optical as well as the mechanical quality.

为了阐明应变诱导双折射的起源和弛豫机制，我们测量了30多种聚合物材料的动态粘弹性和振荡变形下的动态双折射。对一系列乙烯基聚合物的系统研究表明，双折射率以及模量由两个弛豫分量组成;一个在高温和长时间下占主导地位，另一个在低温和短时间下占主导地位。从极化率的各向异性和单体单元的取向导出了一个估算与两种弛豫模式相关的双折射的公式。将理论公式与实验结果相结合，得到了由单体单元的几何各向异性估算取向函数，进而由分子结构估算应力光学系数的方法，并根据预测的双折射度与分子结构的关系，合成了几种聚合物。一些在主链中包括环状结构的聚烯烃被揭示为低双折射。氢化聚苯乙烯也被发现是低双折射。认为不同氢化度的氢化聚苯乙烯的混合物在光学和机械性能方面都是优良的材料。