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Mechanical spectrum study of glass transition by a composite method

机译：复合法研究玻璃化转变的力学光谱

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摘要

Normalized mechanical spectra of glycerol, 1,2-propanediol carbonate and poly(vinyl chloride)/di(2-ethyl-hexyl) phthalate (PVC/DOP) blends were studied in the temperature range from 100 to 300 K by a composite method. The dynamic glass transition was observed, which exhibits a peak of temperature-dependent loss modulus. The peak moves toward higher temperature with higher measuring frequency, which accords with the relaxation feature of the dynamic glass transition. Another characteristic temperature can be marked in the mechanical spectrum by the onset of storage modulus change, which is labeled as T-gm. T-gm is found to be nearly equal to the calorimetric glass transition temperature in glycerol, 1,2-propanediol carbonate and di(2-ethyl-hexyl) phthalate. As we expected, this onset temperature in the mechanical spectrum has an intimate relation with the calorimetric glass transition of materials, and it can be regarded as a representative when the calorimetric glass transition temperature is not available. Finally, normalized mechanical spectra of PVC/DOP blends with different PVC content were obtained and mechanical glass transition temperatures T-gm were determined.
机译：通过复合方法研究了甘油，1,2-丙二醇碳酸酯和聚（氯乙烯）/邻苯二甲酸二（2-乙基己基）邻苯二甲酸酯（PVC / DOP）共混物的归一化机械光谱。观察到动态玻璃化转变，其表现出与温度有关的损耗模量的峰值。峰以更高的测量频率移向更高的温度，这与动态玻璃化转变的弛豫特征一致。另一个特征温度可以通过存储模量变化的开始在机械谱中标记出来，该温度被标记为T-gm。发现T-gm几乎等于甘油，1,2-丙二醇碳酸酯和邻苯二甲酸二（2-乙基己基）酯的量热玻璃化转变温度。如我们所料，机械光谱中的起始温度与材料的量热玻璃化转变有密切的关系，当无法获得量热玻璃化转变温度时，它可以视为代表。最后，获得了不同PVC含量的PVC / DOP共混物的归一化机械光谱，并确定了机械玻璃化转变温度T-gm。

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