利用力化学剪切脱硫废旧胶粉(DGTR)与聚丙烯(PP)进行熔融共混,制备了PP/DGTR复合材料,并研究了DGTR含量对复合材料冲击强度、冲击断面形貌、动态力学性能及PP结晶行为的影响,探讨了PP与DGTR可能存在的化学反应.结果表明,DGTR含量为15％(质量分数,下同)时,复合材料两相间的相容性最好,且冲击强度达到最大(8.5 kJ/m2),比纯PP提高了49.1％;复合材料中存在β六方晶型的PP,且当DGTR含量为30％时,β晶型的含量达到最大(11.2％),脱硫导致胶粉形态的结构变化促进了β晶的产生.%Blends of polypropylene (PP) with devulcanization ground tire rubber (DGTR) were prepared by melt blending,and their impact performance,rheological properties and crystallization behaviors was investigated.Furthermore,reaction mechanisms between PP and DGTR were analyzed.The blend containing 15 wt ％ DGTR achieved maximum Izod impact strength of 8.5 kJ/m2,which was increased by 49.1％ compared with that of pure PP.Based on the analysis of X-ray powder diffraction patterns,there are some β-type crystals of PP in the blends,and the amount of β-type crystals reached 11.2 ％ for the blend containing 30 wt ％ of DGTR.The change in morphology of the powder caused by desulphurization,which promotes the formation of β-type crystals.
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