Time‐temperature superposition in thermorheologically complex materials
Time‐temperature superposition in thermorheologically complex materials
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DOI：
10.1002/polc.5070350106
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发表时间：
2007-03
期刊：
影响因子：
--
通讯作者：
D. Fesko;N. Tschoegl
中科院分区：
文献类型：
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作者：
D. Fesko;N. Tschoegl
两相聚合物材料，如聚合物共混物、嵌段共聚物和接枝共聚物，在热流变学上是复杂的。这种材料在不同温度下得到的力学响应曲线，原则上不能通过沿着对数时间轴或频率轴的简单位移来叠加。除温度外，移位因子还成为时间或频率的函数。本文提出了热流变学复杂材料中时间-温度叠加的一般处理方法，并提出了一个模型，从该模型中，对于两相材料，可以计算位移量，这是在给定温度和时间或频率下获得的机械响应曲线上的一个点在另一个温度下叠加所必需的。必须知道组成均聚物的力学响应及其温度函数。
Two-phase polymeric materials such as polymer blends, block copolymers, and graft copolymers, are thermorheologically complex. Mechanical response curves obtained on such materials at different temperatures cannot, in principle, be brought into superposition by a simple shift along the logarithmic time or frequency axis. The shift factors become functions of time or frequency in addition to temperature. A general treatment of time-temperature superposition in thermorheologically complex materials is developed and a model is proposed from which, for a two-phase material, the amount of shift can be calculated which is necessary to bring a point on a mechanical response curve obtained at a given temperature and time or frequency into superposition at another temperature. The mechanical responses of the constituent homopolymers and their temperature functions must be known.