乙烯-辛烯共聚物增韧改性再生聚丙烯的结构与性能研究
Structure and property of ethylene-octene copolymer toughening modified recycled polypropylene
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摘要: 以再生聚丙烯（RPP）和乙烯-辛烯共聚物（POE）为主要原料，采用熔融共混的加工方法制备了RPP/POE复合体系，并研究了其力学性能、热性能及界面相容剂对其力学性能的影响.结果表明：随着POE添加量的增大，复合体系的拉伸强度和冲击强度均呈先增大后减小的趋势，而断裂伸长率呈先增大后平稳的趋势，弯曲强度则逐渐减小；当POE添加量为5%时，复合体系的拉伸强度达到最大值，为16.7 MPa，当POE添加量为20%时，复合体系的断裂伸长率达到400%，冲击强度是RPP的5倍多，弯曲强度则下降至RPP的50%.复合体系的维卡软化点温度低于RPP，且整体随POE添加量的增大呈降低的趋势，POE对RPP的结晶结构影响较小，同时会对RPP的结晶过程产生阻碍作用.与PP-g-MAH相比，POE-g-MAH更适合用于改善RPP/POE复合体系的强度和韧性.Abstract: The recycled polypropylene (RPP) and ethylene-octene copolymer (POE) were used as the main raw materials.The RPP/POE blends were prepared by melt blending method.The mechanical properties and thermal properties of RPP/POE blends as well as the effect of compatibilizers on the mechanical properties were studied.The results showed that with the increase of POE addition,the tensile strength and impact strength of RPP/POE blends increased at first and then decreased,elongation at break tended to increase first and then stabilize,but the flexural strength decreased gradually.When the addition of POE was 5%,the tensile strength of the blend reached its maximum 16.7 MPa.When the addition of POE exceeded 20%,the elongation at break reached 400%,the impact strength increased to 5 times of that of RPP,and the flexural decreased to 50 % that of RPP.Furthermore,the Vicat softening temperature of the blends decreased with an increase of the POE addition,and the introduction of POE had a little influence on the crystal structure of RPP,but had a baffling effect on the crystallization of RPP.Moreover,compared with PP-g-MAH,compatibilizer POE-g-MAH was more suitable for improving the strength and toughness of RPP/POE blends.
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