摘要
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.
The analysis method previously proposed has been developed to determine two activation energies and stress relaxation modulus for two-phase polymers by using a parallel model of two thermorheologically simple materials as the viscoelastic model of two-phase polymers. By this method the activation energies of relaxation processes around 150℃ and 70℃ were found to be 71.9 and 117.5 kcal/mol respectively for PET/70 PHB copolymer. The latter value agrees with that reported in literature for PET/60 PHB copolymer for the same relaxation process. Additionally, the ten-second relaxation m duli at various temperatures for PET/70PHB have been calculated, the result is consistent with that measured by experiment.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
1993年第1期47-52,共6页
Acta Polymerica Sinica
基金
霍英东教育基金会的资助
关键词
动态力学性质
两相聚合物
温度
Dynamic mechanical pro erty, Stress relaxation, Two-phase polymer, Activation energy, Viscoelasticity
