PP-R复合材料力学性能及结晶行为的研究

Study of Mechanical Properties and Crystallization Behaviors of PP-R Composites

采用注塑成型法制备PP-R复合材料,并结合扫描电子显微镜(SEM)、示差扫描量热仪(DSC)、偏光显微(POM)及X射线衍射分析仪(XRD)等技术,研究了PP-R复合材料的力学性能及结晶行为。结果表明,成核剂(WBGⅡ)对PP-R复合材料综合性能的影响较为明显。加成核剂(WBGⅡ)后,PP-R(RP2400)的冲击强度(29.76 kJ/m^2)与PP-R(T4401)的冲击强度(28.68 kJ/m^2)分别增为56.63、46.82 kJ/m^2,各自提高了90.29%、63.25%;而对拉伸强度和弯曲强度的影响较小。同时,成核剂(WBGⅡ)的加入,能促进PP-R复合材料晶粒细化,诱导α晶型向β晶型转变,从而改善其冲击韧性。

Polypropylene random copolymer （PP-R） composites were prepared by injection molding. The mechanical properties and crystallization behaviors of PP-R composites were investigated by scanning electron microscope, differential scanning calorimetry, and polarized light microscopy and X-ray diffraction analysis. The results show that the effect of nucleating agent （WBG Ⅱ ） on the comprehensive properties of PP-R composites is obvious. After the addition of the nucleating agent （ WBG Ⅱ ）, the impact strength （29.76 kJ/m^2） of PP-R （RP2400） and the impact strength （28.68 kJ/m^2 ） of PP-R （ T4401 ） increase to 56. 63 and 46.82 kJ/m^2, respectively increased by 90. 29% and 63.25% ; however, the nucleating agem （ WBG Ⅱ ） has little effect on the tensile strength and bending strength of the PP-R composites. At the same time, the addition of nucleating agent （WBG Ⅱ ） can promote the grain refinement of PP-R composites and induce the transformation of alpha crystalline form to Beta crystalline form, so as to improve the impact toughness.