竹浆板纤维／高密度聚乙烯复合材料的热性能

Thermal Properties of Bamboo Pulp Fiber-reinforced Polyethylene Composites

采用锥形双螺杆挤出法制备了竹浆板纤维增强高密度聚乙烯复合材料,并通过热重分析仪(TGA)、差热扫描量热议(DSC)、热机械分析仪(DMA)等对其热稳定性、熔融温度、结晶度及热机械性能进行测试分析,研究了竹浆板纤维质量分数对其复合材料热性能的影响。结果表明,竹浆板纤维降低了复合材料起始分解温度,提高了复合材料的残炭率及高温热稳定性;但对复合材料的结晶和熔融峰值温度没有影响,竹浆纤维增强复合材料结晶度随着纤维质量分数的增加而略有提高,但均低于纯高密度聚乙烯的结晶度;纤维质量分数为30%时,复合材料储存模量最高,损耗因子最小。

By the twin-screw extrusion method , bamboo pulp fiber reinforcing high-density polyethylene composites were pre-pared and the thermogravimetric analysis （ TGA） , differential scanning calorimetry （ DSC） and dynamic mechanical analy-sis （DMA） were employed to study the resultant composites ’ thermal stability, melting temperature, crystalline degree and thermo-mechanical properties , respectively , in different bamboo fiber contents .As the bamboo fiber content increases , the initial decomposition temperature of composites decreases , while the amount of char yield and resultant composites ’ thermal stability in high temperature increased .There is no significant effect in the crystallization and melting temperature of composites.The degree of crystallinity of composites can be slightly improved with the increasing amount of bamboo pulp fibers, but still lower than that of neat PP .The bamboo fibers /HDPE composites with the bamboo pulp fiber content of 30%are with higher storage modulus and lower loss factor .