高密度聚乙烯复合导热材料性能

doi:10.19894/j.issn.1000-0518.210019

摘要/Abstract

摘要： 将氮化硼(BN)与高密度聚乙烯(HDPE)熔融共混制备具较高导热性的HDPE/BN复合材料。通过断面形态观察、热学性能、流变性能、力学性能和导热性能研究,讨论了BN质量分数对复合材料性能的影响。结果表明,随着BN质量分数增加,BN颗粒逐渐聚集形成导热通道。当BN质量分数为30%时,复合材料的导热系数达到1.00 W/(m·K),与纯HDPE相比提高156%。同时复合材料的弹性模量提高75%,冷结晶温度提高1.5 ℃,熔体黏度和模量提高2倍。证明BN不仅改善了复合材料的流变性和冷结晶,还提高了复合材料的导热性和弹性模量。

关键词: 高密度聚乙烯, 氮化硼, 复合材料, 导热性

Abstract: High-density polyethylene (HDPE)/boron nitride (BN) composites with higher thermal conductivity were prepared by melt blending. Through the study of phase morphology, thermal, rheological and mechanical properties and thermal conductivity, the influence of the BN content on the properties of HDPE/BN composites was discussed. The results show that the BN particles gradually aggregate to form heat conduction channels with the increase of the mass content of BN. When the mass content of BN is increased to 30%, the thermal conductivity of the HDPE/BN composite reaches 1.00 W/(m·K) and is increased by 156% compared with pure HDPE. At the same time, the elastic modulus of the composites is increased by 75%, the cold crystallization temperature increases 1.5 ℃, and the melt viscosity and modulus are increased twice compared to pure HDPE. It is proved that BN not only improves the rheological properties and cold crystallization of HDPE, but also increases the thermal conductivity and elastic modulus.

Key words: High-density polyethylene, Boron nitride, Composites, Thermal conductivity

中图分类号:

O632

李祎, 程宏达, 于彦存, 韩常玉, 陈广建, 祝英男. 高密度聚乙烯复合导热材料性能[J]. 应用化学, 2021, 38(8): 954-960.

LI Yi, CHENG Hong-Da, YU Yan-Cun, HAN Chang-Yu, CHEN Guang-Jian, ZHU Ying-Nan. Performance of Thermal Conductive High Density Polyethylene Composite[J]. Chinese Journal of Applied Chemistry, 2021, 38(8): 954-960.

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