耐热聚丙烯专用料的结构与性能

采用凝胶色谱仪、升温淋洗分析仪、差示扫描量热仪以及X射线衍射仪对国产耐热聚丙烯H8020和2种进口耐热聚丙烯的结构进行表征，进一步采用熔体流动速率仪、万能材料试验机、摆锤冲击仪以及维卡热变形测定仪对性能进行测定。结果表明，H8020的弯曲强度为39.4 MPa、弯曲模量为1 820 MPa、拉伸强度为37.5 MPa、冲击强度为3.2 kJ/m²，具有良好的刚韧平衡性，热变形温度为115 ℃，维卡软化温度为158 ℃，综合性能达到甚至超过国外同类材料。

Structure and Performance of Heat?Resistant Polypropylene Special Material

The structure of heat?resistant polypropylene special material (H8020) was characterized by gel permeation chromatography, temperature rising elution fractionation, differential scanning calorimetry and X?ray diffractometer, and its mechanical and heat?resistant properties were investigated by melting flow rate instrument, universal material testing machine, pendulum machine and thermal deformation & Vicat softening temperature tester. The results indicated that the heat?resistant polypropylene exhibited the flexural strength of 39.4 MPa, the flexural modulus of 1 820 MPa, the tensile strength of 37.5 MPa and the izod impact strength of 3.2 kJ/m², presenting a good balance between rigidity and toughness. Moreover, this special material also showed a thermal deformation temperature of 115 °C and a Vicat softening temperature of 158 °C. It is concluded that the comprehensive performance of the domestic product H8020 is superior to that of foreign products.