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离子聚合物改性木粉/HDPE复合材料流变特性

, PP. 937-943

Keywords: 木塑复合材料,离子聚合物,毛细管流变,剪切应力,表观黏度

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Abstract:

为了提高木塑复合材料(WPC)的加工流动性能,利用离子聚合物改性WPC,通过HAAKEMinilab微量混合流变仪研究了离子聚合物改性木粉/高密度聚乙烯(HDPE)的毛细管流变特征。结果表明:添加与未添加离子聚合物的木粉/HDPE均为非牛顿流体中的假塑性流体,均呈现出“剪切变稀”的效应;随着钠离子聚合物含量的增加,改性木粉/HDPE的剪切应力和表观黏度均随着剪切速率的增大呈现降低的趋势,表明钠离子聚合物的加入可以显著改善聚合物熔体的流动特性;添加4wt%的钠离子聚合物和4wt%的锌离子聚合物的木粉/HDPE剪切应力和表观黏度均要低于添加4wt%的偶联剂马来酸酐接枝聚乙烯(MAH-g-PE)的WPC的值,表明与MAH-g-PE相比,离子聚合物更能够改善WPC的流动性能,减小熔体流动时HDPE与木粉之间的摩擦阻力;SEM分析表明,添加离子聚合物后HDPE塑料对木粉有很好的包覆效果,没有明显的界面缝隙,且在WPC断面上存在大量的毛刺纤维。

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