木粉填充HDPE/PVC复合材料的热稳定性及流变行为

Study on Thermal Stability and Rheological Property of Wood Flour-filled HDPE/PVC Composites

以聚磷酸铵(APP)和Al(OH)3为阻燃剂,通过熔融挤出制备了具有阻燃性能的高密度聚乙烯/聚氯乙烯(HDPE/PVC)基木塑复合材料,研究了PVC对木塑复合材料热稳定性及流变行为的影响。热失重分析结果表明:APP和PVC均可促进木粉成炭,同时提高了HDPE的热稳定性;流变测试结果表明:PVC与木粉的相容性较HDPE要好,并能促进木粉在体系中均匀分散,改善木塑复合材料体系的加工流动性;锥形量热测试结果表明:PVC脱氯、Al(OH)3热分解均吸收大量热量,可降低复合材料的热释放速率与热释放总量。

Wood flour/PE/PVC （WPS） composites were prepared by melt extrusion, with APP and Al（OH）3 used as flame retardants. The effects of PVC additive on thermal stabilities and rheological properties of the WPC were also studied extensively. The thermogravimetry analysis （TGA） of the WPC shows that PVC and APP can promote wood flour （WF） char forming. Due to the fair compatibility between PVC and WF, the processing rheology of WPC significantly improves. In addition, CONE calorimeter tests show that both dechlorination of PVC and thermal decomposition of Al（OH）3 absorb a large amount of heat, which further reduces the heat release rate as well as the total heat release of the composite materials.