增粘改性PET流变性能研究

Study on rheological properties of tackified modified PET

以环氧树脂为扩链剂对聚对苯二酸乙二醇酯(PET)进行了增粘改性,并对其流变性能进行了研究,探讨了扩链剂类型以及含量在不同工艺条件下对复合材料流变性能的影响。研究结果表明:PET熔体为假塑性流体,增粘改性后仍为假塑性流体,在E20、E22、E23 3种环氧树脂中,E20能较大程度地提高熔体的表观粘度。在实验研究的范围内,PET熔体的表观粘度和粘流活化能随着环氧树脂含量的增大而增大,熔体的表观粘度随着温度的升高而降低。在低剪切应力下,熔体的粘流活化能较大,表观粘度对温度的变化较敏感,而在高剪切应力下,熔体的粘流活化能减小,表观粘度对温度的变化不敏感。

The tackifying modification of polyethylene terephthalate（ PET） was with epoxy resin as chain extender, and the rheological property were studied, the effects of the types and content of chain extender on the rheological properties of composite materials under different technology conditions were investigated. The results show that PET is pseudoplastic fluid before and after tackifying modification, E20 can greatly increase the apparent viscosity of the melt among E20, E22, E23 3 kinds of epoxy resin.In the experimental study, the apparent viscosity of PET melt and flow activation energy increase with the increase of the content of epoxy resin, the apparent viscosity of the melt decreases as the temperature rises. Under low shear stress, the viscosity flow activation energy of the melt is higher, the change of the apparent viscosity to temperature is more sensitive, and at high shear stress, the viscosity flow activation energy of melt decreases, the change of the apparent viscosity to temperature isn＇t sensitive.