环氧呋喃树脂反应性增容PLA/PBS共混体系的动态流变学表征

Dynamic Rheological Characterization of PLA/PBS Blends Compatibilized by Epoxy Furan Resin

用熔融共混法制备不同环氧呋喃树脂(FER)含量的聚乳酸/环氧呋喃树脂/聚丁二酸丁二醇酯(PLA/FER/PBS)共混物,使用旋转流变仪、扫描电镜(SEM)和万能试验机等手段研究了FER含量对PLA/PBS共混体系的动态流变行为和相容性的影响。结果表明:当应变(γ)小于30%时动态模量不随γ的变化而变化,共混体系表现出线性黏弹行为;当γ大于30%后动态模量明显降低,出现了"Payne"效应。FER能改善PLA/PBS共混体系的加工性能;PLA/PBS共混体系有两个不同的驰豫过程,使曲线出现两个明显的半圆弧,加入FER后PLA和PBS两相的形态发生了改变;当FER含量为0.3 phr时共混体系的Han曲线与v GP曲线重叠,表明PLA和PBS的相容性较好;当FER含量为0.3 phr时PLA与PBS的界面黏附性最佳,表明PLA与PBS具有最为理想的界面相容性;FER添加量为0.3 phr时共混物的拉伸强度和冲击强度分别达到最大值56.9 MPa和4.33 k J/m2,比PLA/PBS共混物提高了11.2%和37.0%。

Poly（lactic acid）/epoxy furan resin/poly（butylene succinate）（PLA/FER/PBS） blends with different epoxy furan resin（FER） content were prepared by melt blending, while the effect of FER content on the dynamic rheological behavior and compatibility of the PLA/PBS blends was investigated by means of rotary rheometer, scanning electron microscopy（SEM） and universal testing machine. Results show that when the strain（γ） is less than 10%, the dynamic modulus does not change with the change of γ and the blends show linear viscoelastic behavior; when γ is more than 10%, the dynamic modulus decrease obviously, showing the ＂Payne＂ effect; FER can improve the processing properties of PLA/PBS blends;PLA/PBS blends have two different relaxation processes, the relevant curves have two distinct half arc,PLA and PBS phase morphology changed with the addition of FER; the time-and temperature-superposition-curves show that for PLA/PBS blends with FER content of 0.3 phr, of which, the Han-curves and v GP-curves of the blends present good overlap, implying the compatibility between PLA and PBS is good; the interface adhesion between PLA and PBS is the best, and the PLA and PBS has the most ideal interfacial compatibility; the tensile strength and impact strength of the blends reached the maximum value of 56.9 MPa and 4.33 k J/m2, which is 11.2% and 37% higher than that of the simple PLA/PBS blends,respectively.