DETERMINATION OF THE REFRACTIVE-INDEX AND BIREFRINGENCE FOR BIAXIALLY STRETCHED POLY(ETHYLENE-TEREPHTHALATE) AT MICROWAVE-FREQUENCIES

被引：17

作者：

OSAKI, S

URANISHI, K

机构：

[1] Research and Development, Kanzaki Paper Manufacturing Company Ltd, Amagasaki, Hyogo, 660, 4-3-1, Jokoji

来源：

POLYMER | 1990年 / 31卷 / 01期

关键词：

birefringence; dielectric anisotropy; microwave frequency; poly(ethylene terephthalate); refractive index;

D O I：

10.1016/0032-3861(90)90344-X

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Refractive index and birefringence were determined without contact for biaxially stretched poly(ethylene terephthalate) (PET) films at a microwave frequency. The following relationship was obtained between the birefringences ΔnMW at a frequency of 4.0 GHz and ΔnOPT at a visible wavelength of 589 nm for many kinds of biaxially stretched PET films: ΔnMW = 1.3933 ΔnOPT. The correlation coefficient between ΔnMW and ΔnOPT was 0.969, indicating a very good correlation. On the other hand, the observed relation between the refractive indices nMW at 4.0 GHz and nOPT at 589 nm could be expressed as nMW = -0.5567 + 1.4243 nOPT. The nMW was larger than the nOPT in all the directions of the sheet plane. This difference may arise from difference in contribution of ε′ associated with the local motion (β-relaxation) of PET molecules. © 1990.

引用

页码：33 / 35

页数：3

共 14 条

[1]

ALTSCHLER HM, 1963, HDB MICROWAVE MEASUR

[2]

HOSHINO S, 1962, J POLYM SCI, V58, P185, DOI 10.1002/pol.1962.1205816610

[3] EFFECTS OF DEGREE OF CRYSTALLINITY UPON DIELECTRIC BEHAVIORS IN SOME AROMATIC POLYESTERS [J].