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提出用两个热流变简单粘弹体的并联体系作为两相聚合物的粘弹模型,将先前的动态力学温度谱分析方法推广到两相聚合物中去.运用这种新方法从动态力学数据求出了PET/70PHB共聚物的双活化能,其中150℃左右的转变活化能为71.9kcal/mol,70℃左右的转变活化能为117.5koal/mol,这一数值与文献上PET/60PHB这个转变的活化能120kcal/mol相接近.文中还计算了共聚物在不同温度下的10s应力松弛模量,所得结果与实测值相吻合.
A parallel viscoelastic model of two-phase polymer with two parallel systems of thermo-rheological simple viscoelasticity is proposed to extend the previous dynamic-mechanical temperature spectrum analysis into two-phase polymers.Using this new method, dynamic mechanical data The activation energy of PET / 70PHB copolymer was obtained. The activation energy of transformation at about 150 ℃ was 71.9kcal / mol and the activation energy of transformation at about 70 ℃ was 117.5koal / mol. This value is in agreement with the literature on PET / 60PHB The activation energy of the transition is close to 120kcal / mol.The stress relaxation modulus of the copolymer at different temperatures is also calculated in this paper, and the obtained results are consistent with the measured values.