
氧化铝/聚烯烃复合材料的制备与性能研究
马书鑫, 王艳芝, 南钰, 岳献阳, 张一飞, 范惠玲
氧化铝/聚烯烃复合材料的制备与性能研究
Study on Preparation and Properties of Al2O3/Polyolefin Composites
为了探究Al2O3/聚烯烃复合材料的结构与性能,先使用硅烷偶联剂对球形Al2O3进行预处理,以预处理后的Al2O3为填料,以高密度聚乙烯(HDPE)/聚丙烯(PP)混合物(质量比5∶95)为基体,通过初混和熔融共混方法制备Al2O3/HDPE/PP复合材料,研究了Al2O3质量分数对复合材料结构与性能的影响。结果表明:填充Al2O3可以显著提高复合材料的导热系数,导热系数随Al2O3质量分数的增加而提高,当Al2O3质量分数为25%时,复合材料的导热系数为0.331 W/(m∙K),比纯聚烯烃基体材料提高了231%。高填充量的复合材料内部Al2O3颗粒间隙明显变小,这将有利于构建导热通路。较低含量Al2O3刚性粒子的存在可以提高聚合物结晶能力。同时,添加球形Al2O3能够显著提高复合材料的熔体流动速率,改善其加工性能。
In order to investigate the structure and properties of Al2O3/polyolefin composites, spherical Al2O3 was pretreated with a silane coupling agent, and high density polyethylene (HDPE)/polypropylene (PP) composites were prepared by primary mixing and melt blending with pretreated Al2O3 as filler and high density polyethylene (HDPE)/polypropylene (PP) mixture (mass ratio 5∶95) as matrix. The investigation of the influence of the mass fraction of Al2O3 on the structure and properties of the composites was studied. The results showed that the addition of Al2O3 significantly enhanced the thermal conductivity of the composites. Specifically, the thermal conductivity increased proportionally with the mass fraction of Al2O3. When the Al2O3 mass fraction reached 25%, the thermal conductivity of the composite measured 0.331 W/(m∙K), which was 231% higher than that of the pure polyolefin matrix material. Moreover, the presence of Al2O3 particles with high filler content led to a noticeable reduction in gaps within the composite, thereby facilitating the construction of thermal conductivity pathways. Additionally, the incorporation of a lower content of rigid Al2O3 particles improved crystallization ability of the polymer. Notably, the addition of the spherical Al2O3 also significantly enhanced the melt flow rate of the composites, and improved its processing performance.
Polypropylene / High density polyethylene / Alumina / Thermal conductivity
TB332
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