高导热绝缘尼龙复合材料的制备和性能

Preparation and Properties of High Thermally Conductive and Insulating PA Composites

以尼龙6(PA6)为基体,采用两种不同粒径的氧化铝(Al2O3)按1∶1混合后,再与高导热填料氮化铝(Al N)复配成导热填料,采用熔融挤出法制备PA6/Al2O3/Al N导热绝缘复合材料。研究了复配填料含量为60%时,复配填料中Al N含量对复合材料力学性能、导热性能和结晶性能的影响。采用扫描电子显微镜(SEM)对复合材料的微观形貌进行了表征。结果表明,复合材料的热导率随着复配填料中Al N含量的增加而增大。复合材料的拉伸强度和弯曲强度随复配填料中Al N含量的增加先增大再减小,Al N含量占复配填料的50%时,复合材料拉伸强度和弯曲强度分别达到最大值83.09 MPa和137.14 MPa。复合材料的结晶度和熔融温度没有显著变化。扫描电镜显示填料与基体的相容性较好。

Nylon 6 （ PA6 ） was used as the matrix, two different sizes of alumina （ Al2O3 ） was first mixed with the mass ratio Was 1：1, then mixed with high thermal conductivity filler aluminum nitride （AlN） to prepare thermally conductive filler, then high thermally conductive and insulating PA6/Al20JAlN composites were prepared using melt extrusion method. When the total filler content was 60%, the influence of AlN filler content of composites on the mechanical properties, thermal properties and crystallization properties were studied. Scanning electron microscopy （SEM） was used to characterize the microstructure of composites. The results showed that the thermal conductivity of composites increased with the content of AlN increasing. With AlN content of the composite filler increased, the tensile strength and bending strength of composites first increased and then decreased. When AlN content of filler was 50%, tensile strength and flexural strength of composites reached the maximum, 83.09 MPa and 137.14 MPa separately. Degree of crystallinity and melting temperature of the composites were not significantly changed. SEM showed that the compatibility between filler and matrix was better.