原位反应加工制备BN/PMMA/PP导热复合材料的性能研究

Properties of BN/PMMA/PP Thermal Conductive Composite Prepared by In-situ Reaction Processing

采用原位反应加工法和熔融共混法制备氮化硼(BN)/聚甲基丙烯酸甲酯(PMMA)/聚丙烯(PP)复合材料,利用导热测试仪、动态热机械分析仪、维卡软化点测试仪以及扫描电子显微镜(SEM)对复合材料结构和性能进行了表征。实验结果表明,原位反应加工法制备的BN/PMMA/PP材料的导热性能明显高于普通熔融共混法所制备的材料,随着BN填充量的增加,BN/PMMA/PP材料的导热系数逐渐升高,当BN质量分数为15%时,原位反应加工法制备的BN/PMMA/PP复合材料的导热系数达到0.56 W/(m·K),比普通熔融共混的热导率提高了44%。当BN含量为5%时,原位反应加工法制备的BN/PMMA/PP复合材料的维卡软化温度达到最高104.2℃,并且复合材料的储能模量显著提高。导热填料BN的选择性分散有助于提高BN/PMMA/PP材料的导热性能、耐热性能和动态力学性能。

Boron nitride(BN)/polymethyl methacrylate(PMMA)/polypropylene(PP)composites were prepared by in-situ reactive extrusion and melt blending.The structure and properties of the composites were characterized using thermal conductivity tester, dynamic thermomechanical analyzer, Vicat softening point tester, and scanning electron microscope(SEM).The experimental results show that the thermal conductivity of BN/PMMA/PP materials prepared by in-situ reactive processing is significantly higher than that of the materials prepared by ordinary melt blending method, and the thermal conductivity of BN/PMMA/PP materials is gradually increasing with the increase of BN filling.When the addition of BN is 15%,the BN/PMMA/PP thermal conductivity of the composites prepared by in-situ processing could reach 0.56 W/(m·K),which is 44%higher than the thermal conductivity of ordinary melt blending.When the BN content is 5%,the Vicat softening point of BN/PMMA/PP composites prepared by in-situ reactive processing reaches a maximum of 104.2 ℃ and the energy storage modulus of the composites is significantly increased.The selective dispersion of BN is helpful to improve the thermal conductivity, heat resistance and dynamic mechanical properties of BN/PMMA/PP materials.