Dynamic mechanical properties of polyethylene terephthalate
Dynamic mechanical properties of polyethylene terephthalate
复制标题
聚对苯二甲酸乙二醇酯的动态机械性能
DOI：
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发表时间：
1958
期刊：
影响因子：
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通讯作者：
T. Kawaguchi
中科院分区：
文献类型：
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作者：
T. Kawaguchi
在−70至+310 ° C的温度范围内，测量了聚对苯二甲酸乙二醇酯的动态力学性能。以100-200周/秒的速度。通过悬臂梁振动方法。两个机械损耗最大值已被区分，并与结晶度和取向度的变化，并在材料的水含量的影响进行了研究。示出的主要软化区域的结晶度的变化的影响。另一个过程发生在低温下，受材料含水量变化的影响。当吸收水时，损失最大值的高度增加，尽管发生最大损失的温度保持不变。最后，低温工艺进行了比较的一系列聚酯的成员。增加环状基团之间的距离会使最大损耗温度略有降低。交换理事会
O基团降低了最高损失温度。
Dynamic mechanical properties of polyethylene terephthalate have been measured as function of temperature at −70 to +310°C. at 100–200 cycles/sec. by a cantilever vibration method. Two mechanical loss maxima have been distinguished, and effects associated with variations in the degree of crystallinity and orientation and in the water content of the material have been investigated. The main softening region is shown to be influenced by the variations in the degree of crystallinity. Another process, which occurs at low temperature, is affected by changes in the water content of the material. The height of the loss maximum is increased when water is absorbed, although the temperature at which maximum loss occurs remains unchanged. Finally, the low temperature process is compared for members of a series of polyesters. Increasing the distance between the cyclic groups brings about a slight reduction in the temperature of this loss maximum. Interchange of the positions of the
and O groups depresses the loss maximum temperature.