偶联剂对HDPE基竹塑复合材料性能的影响

以高密度聚乙烯(HDPE)、竹粉(BF)为原料,马来酸酐接枝聚丙烯(MAH-g-PP)作为偶联剂,通过混炼、平板热压成型制备竹粉/HDPE复合材料,研究了马来酸酐接枝聚丙烯添加量(0、2%、5%、8%)对竹粉/HDPE复合材料吸湿性、吸水性、弯曲强度、拉伸强度以及抗冲击强度等性能的影响。结果表明:MAH-g-PP能显著改善竹粉/HDPE复合材料的吸湿、吸水性能,明显提高复合材料的力学性能; 当MAH-g-PP添加量为5%时,复合材料的吸湿、吸水率最低,静曲强度与弹性模量分别提高68%和30.4%,拉伸强度与抗冲击强度分别增长53.7%和75%; 而当MAH-g-PP添加量为8%时,复合材料的力学性能在一定程度上有所降低。红外光谱(FTIR)分析显示,添加MAH-g-PP后竹粉的游离羟基与马来酸酐之间发生了酯化反应。

Effect of MAH-g-PP on properties of bamboo flour(BF)/high density polyethylene(HDPE) composites

In this work, maleic anhydride grafted polypropylenee(MAH-g-PP)as coupling agent was added to high density polyethylene(HDPE)and bamboo flour(BF)composites which were processed by internal mixer and hot-pressing technology. The results showed that the properties of composites were significantly improved after adding MAH-g-PP. The optimum additive amount is 5%, at this level, the values of hygroscopicity and water absorption of composites were the smallest, and the values of modulus of rupture(MOR)and modulus of elasticity(MOE)were increased by 68% and 30.4%, respectively. The tensile strength and impact strength were increased by 53.7% and 75%, respectively. However, when the additive amount of MAH-g-PP reached 8%, the values of MOR, tensile strength and impact strength decreased. Fourier transform infrared spectroscopy(FTIR)confirmed that the grafting reaction happened between free hydroxyls of bamboo flour and acid anhydride of MAH-g-PP.