Estimation of intrinsic birefringence of poly(ethylene terephthalate) crystal
Estimation of intrinsic birefringence of poly(ethylene terephthalate) crystal
复制标题
聚对苯二甲酸乙二醇酯晶体的固有双折射的估计
DOI：
10.1016/0032-3861(79)90217-9
复制
发表时间：
1979
期刊：
影响因子：
4.6
通讯作者：
M. Hashimoto
中科院分区：
文献类型：
--
作者：
T. Kunugi;K. Shiratori;Kenji Uematsu;M. Hashimoto
本文用Orito方法，根据实验数据和理论计算，估算了聚对苯二甲酸乙二酯晶体的本征双折射率。进行实验估计的基础上的假设的两相模型组成的结晶和非晶相和双折射贡献的加和性-即总双折射等于从结晶和非晶相的取向贡献的总和，和形式的双折射。通过Orito方法实验外推的值约为。0.24.另一方面，使用根据邦恩的键极化率值和根据Daubenyet al的晶体内原子排列以通常的方式进行理论计算。计算值为0.251。并对两种结果的差异进行了讨论。
The intrinsic birefringence of poly(ethylene terephthalate) crystal has been estimated by means of the Orito method using experimental data and using theoretical calculation. The experimental estimation was performed on the basis of the assumption of a two-phase model consisting of crystalline and amorphous phases and the additivity of birefringence contributions — that total birefringence is equal to the sum of the orientation contributions from crystalline and amorphous phases, and of form birefringence. The value experimentally extrapolated by the Orito method is approx. 0.24. On the other hand, the theoretical calculation was carried out in the usual way using the values of bond polarizabilities according to Bunn and the atomic arrangements within the crystal according to Daubenyet al.The calculated value is 0.251. The difference between two results is also discussed.