THERMAL-CONDUCTIVITY OF POLYETHYLENE - EFFECTS OF CRYSTAL SIZE, DENSITY AND ORIENTATION ON THERMAL-CONDUCTIVITY
THERMAL-CONDUCTIVITY OF POLYETHYLENE - EFFECTS OF CRYSTAL SIZE, DENSITY AND ORIENTATION ON THERMAL-CONDUCTIVITY
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DOI：
10.1002/pen.760120308
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发表时间：
1972-01-01
影响因子：
3.2
通讯作者：
BERNIER, GA
中科院分区：
文献类型：
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作者：
HANSEN, D;BERNIER, GA
对在不同温度下结晶的聚乙烯样品进行了热导率测量，以改变密度和层状晶体厚度。用机械剪切法和温度梯度结晶法对聚乙烯进行了定向试验。当密度从0.96 ~ 0.99 gm/cc时，导热系数线性增加50%。在分子取向方向上，电导率提高了10倍，在垂直方向上，电导率降低了2倍。对于在不同温度下变形取向的样品，电导率明显与双折射相关。
Thermal conductivity measurements were made on polyethylene samples which had been crystallized at different temperatures in order to vary density and lamellar crystal thickness. Tests were also made on polyethylenes which were oriented by mechanical shearing and by crystallization in a temperature gradient. The thermal conductivity increased linearly by 50% as the density went from 0.96 to 0.99 gm/cc. By orientation the conductivity was increased ten fold in the direction of molecular orientation and decreased two fold in the perpendicular direction. For samples oriented by deformation at different temperatures, the conductivity apparently correlates with birefringence.