增容剂对聚对苯二甲酸丁二酯/聚丙烯共混体系相形态、热稳定性与流变性能影响研究

Influence of compatibilizer on phase morphology and thermal stability and rheological property of PBT/PP blend

为了丰富聚对苯二甲酸丁二酯(PBT)纤维品种,以乙烯-醋酸乙烯共聚物接枝马来酸酐(EVA-gMAH)、乙烯-辛烯共聚物接枝甲基丙烯酸缩水甘油酯(POE-g-GMA)和乙烯-丙烯酸酯-甲基丙烯酸缩水甘油酯(EMG)为增容剂,采用熔融共混法制备了不同组成比例的PBT/PP共混物,通过扫描电镜、差示扫描量热法、热失重分析法和毛细管流变仪等手段测试了共混物,考察增容剂种类和用量对共混物结构性能的影响。结果表明:共混物PBT/PP为不相容体系,选择共混物PBT/PP为70/30(质量比)时加入3种增容剂,发现增容剂对PBT/PP共混的增容效果为:EMG>POE-g-GMA>EVA-g-MAH。共混物的熔点无明显变化,分解温度增加,耐热性增强。对比不同种类增容剂含量为1份的共混物,其表观黏度均随着剪切速率的增大而减小,说明改性共混物是假塑性流体。

In order to enrich PBT fiber varieties that PBT/PP blends were prepared by melt blending with ethylene/vinyl acetate copolymer grafted malefic anhydride(EVA-g-MAH)and glycidylmethacrylate grafted polyethylene-octene elastomer(POE-g-GMA)and ethylene copolymer/maleic anhydride/glycidyl methacrylate(EMG)as compatibilizers.The structure and properties of the blends were characterized by SEM,DSC,TG and capillary rheometer.The influence of the type and amount of compatibilizer on the structure and properties of the blends was investigated in detail.Results showed that the blends PBT/PP were incompatible.When the PBT/PP was 70/30,three kinds of compatibilizers were added and the compatibility effect of compatibilizer on PBT/PP blending compatibility was found.EMG was better than POE-g-GMA,EVA-g-MAH.The melting point of the blends had no obvious change,the decomposition temperature increased,and the heat resistance increased.The apparent viscosity of blends with different types and content of 1%compatibilizer decreased with the increase of shear rate,indicating that the modified blends were pseudoplastic fluid.