PBT/E-MA-GMA/碳酸钙复合材料的结构与性能研究

Structure and mechanical properties of poly(butylenes terephthalate)/ethylene-methacrylic acid-glycidyl methacrylate terpolymer (E-MA-GMA)/CaCO_3 composites

采用2种粒径CaCO3分别与乙烯-丙烯酸甲酯-甲基丙烯酸缩水甘油酯三元共聚物(E-MA-GMA)弹性体并用,制备了PBT/E-MA-GMA/CaCO3复合材料。扫描电镜分析发现纳米CaCO3自身易形成团聚粒子,且有许多E-MA-GMA包覆在纳米CaCO3团聚粒子表面,分散不好。而微米CaCO3与E-MA-GMA倾向于单独分散,分散相尺寸较小。力学性能测试表明,E-MA-GMA与适量微米CaCO3并用具有协同增韧作用。当E-MA-GMA质量分数为10%时,复合材料的缺口冲击强度在微米CaCO3质量分数达到10%左右,出现最大值为46.5kJ/m2,其冲击韧性值接近PBT/E-MA-GMA(质量比85∶15)共混物的冲击韧性值53.9kJ/m2,而大大高于PBT/E-MA-GMA(质量比90∶10)共混物的缺口冲击韧性值18.8kJ/m2。

Poly （butylenes terephthalate）（ PBT）/ethylene-methacrylic acid-glycidyl methacrylate terpolymer （E-MA- GMA）/CaCO3 composites were prepared by addition of two kinds of CaCO3 fillers with different particle sizes and E-MA-GMA into PBT respectively. SEM micrographs revealed that nano-CaCO3 tended to aggregate and capsulated by E-MA-GMA to form large particles dispersing worse in matrix, whereas micron-CaCO3 and E-MA-GMA had a tendency to form a dispersion phase alone with smaller domain size. The mechanical properties testing indicated that E-MA-GMA and micron-CaCO3 had synergistic toughening effect on PBT. When the mass ratio of micron-CaCO3 was 10%, the notched impact strength of the composite containing 10% mass ratio of E-MA-GMA had a maximum of 46.5 kJ/m^2 close to PBT/E-MA-GMA（85 ： 15 of mass ratio） blend＇s notched impact strength of 53.9 kJ/m^2,which was much higher than PBT/E-MA-GMA（90：10 of mass ratio） blend＇s notched impact strength of 18.8 kJ/m^2.