Explanation of orientation patterns determined for sheet materials by means of microwaves
Explanation of orientation patterns determined for sheet materials by means of microwaves
复制标题
通过微波确定片材取向图案的说明
DOI：
10.1063/1.345127
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发表时间：
1990
影响因子：
3.2
通讯作者：
S. Osaki
中科院分区：
文献类型：
--
作者：
S. Osaki
未拉伸、双轴拉伸和单轴拉伸的聚（对苯二甲酸乙二醇酯）（PET）膜显示出不同类型的三维图案，即，发射微波强度的频率和角度依赖性。双轴和单轴拉伸PET膜的共振频率和共振频率处的强度随旋转角度而变化，而未拉伸PET膜的共振频率和共振频率处的强度保持不变。因此，这些性质反映了聚合物膜的介电各向异性。在固定频率下，即，取向模式给出了取向角和透射微波强度的最大与最小比率。可以通过以固定频率切割三维图案来获得取向图案。该频率应选择在谐振频率以上，其中发射的微波强度是谐振曲线中谐振频率处的一半，该谐振曲线被锁定。
Unstretched, biaxially stretched, and uniaxially stretched poly(ethylene terephthalate) (PET) films showed different types of three‐dimensional pattern, i.e., the frequency and angular dependencies of transmitted microwave intensity. The resonance frequency and the intensity at the resonance frequency for the biaxially and uniaxially stretched PET films changed with rotation angle, while those for the unstretched PET films stayed unchanged. Thus these properties reflected the dielectric anisotropy of the polymer films. The angular dependence of transmitted microwave intensity at a fixed frequency, i.e., the orientation pattern, gave an orientation angle and a maximum‐to‐minimum ratio of transmitted microwave intensity. The orientation pattern can be obtained by cutting the three‐dimensional pattern at the fixed frequency. This frequency should be selected above the resonance frequency, where the transmitted microwave intensity is one‐half that at the resonance frequency in the resonance curve which is loc...