PA6基绝缘导热工程塑料老化性能研究
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摘要
将聚酰胺6(PA6)按比例与导热填料(氧化铝、氮化硼)、玻璃纤维及抗氧剂经挤出共混法制得绝缘导热复合材料。研究了不同热老化条件下PA6基导热复合材料的老化行为,重点研究了老化温度和老化时间对材料老化性能的影响,并与纯PA6材料进行了对比。结果表明:材料的老化由表及里发生,样品表层及次外层的老化破坏强于内层;随着老化温度的升高,材料的老化进程加快,且PA6基导热材料比纯PA6材料更耐老化。材料的力学性能受老化温度和老化时间的影响最大,在老化初期,材料的力学性能因结晶重排和应力松弛而上升,之后随老化时间的延长而下降;材料的导热系数受老化时间的影响较小,但随测试温度的升高而略有减小;老化温度及时间对于材料密度及结晶温度、熔融温度及结晶度的影响不大。
Insulating and thermal conductive composites were prepared by extrusion blending method from polyamide 6(PA6), thermal conductive fillers including alumina and boron nitride, and glass fiber in proportion. The ageing behaviors of the PA6 based thermal conductive composites under different ageing conditions were studied, and the effects of ageing temperature and ageing time on the ageing properties of the PA6 based composites were mainly studied, and then the results were compared with that of neat PA6 resin under the same conditions. The results show that the material is aged from the surface to the center, and the deterioration of surface layer and outer layer of the sample are more serious than that of the inner layer. With the increase of ageing temperature, the ageing process is accelerated, and the ageing resistance of PA6 based thermal conductive composites is better than that of neat PA6. The mechanical properties of the materials are most affected by the ageing temperature and ageing time. At the initial stage of ageing, the mechanical properties of materials increase due to the rearrangement of crystals and stress relaxation, and then decrease with the ageing time. The thermal conductivities of the materials are less affected by ageing time, but slightly decrease with the increase of test temperature. The ageing temperature and ageing time have little effect on the density, crystallization temperature, melting temperature, and, crystallinity of materials.
Insulating and thermal conductive composites were prepared by extrusion blending method from polyamide 6(PA6), thermal conductive fillers including alumina and boron nitride, and glass fiber in proportion. The ageing behaviors of the PA6 based thermal conductive composites under different ageing conditions were studied, and the effects of ageing temperature and ageing time on the ageing properties of the PA6 based composites were mainly studied, and then the results were compared with that of neat PA6 resin under the same conditions. The results show that the material is aged from the surface to the center, and the deterioration of surface layer and outer layer of the sample are more serious than that of the inner layer. With the increase of ageing temperature, the ageing process is accelerated, and the ageing resistance of PA6 based thermal conductive composites is better than that of neat PA6. The mechanical properties of the materials are most affected by the ageing temperature and ageing time. At the initial stage of ageing, the mechanical properties of materials increase due to the rearrangement of crystals and stress relaxation, and then decrease with the ageing time. The thermal conductivities of the materials are less affected by ageing time, but slightly decrease with the increase of test temperature. The ageing temperature and ageing time have little effect on the density, crystallization temperature, melting temperature, and, crystallinity of materials.
引文
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[2]陈兵.导热塑料在LED灯具上的应用[J].通信电源技术,2015,32(4):101-105.
[3]杨海民,张翼翔,郑润金.导热塑料研究进展[J].合成材料老化与应用,2015(6):105-110.
[4]王晓群,陈家锋,黄珂伟,等.低温高抗冲高导热PA6的制备及改性[J].工程塑料应用,2017,45(1):29-34.
[5]MENG Fanbin,HUANG Fei,GUO Yifan,et al.In situ,intercalation polymerization approach to polyamide-6/graphite nanoflakes for enhanced thermal conductivity[J].Composites Part B Engineering,2017,117:165-173.
[6]JIA Y C,He H,YU P,et al.Synergistically improved thermal conductivity of polyamide-6 with low melting temperature metal and graphite[J].Express Polymer Letters,2016,10(8):679-692.
[7]DOS SANTOS WN,DE SOUSA J A,JREGORIO R.Thermal conductivity behavior of polymers around glass transition and crystalline melting temperatures[J].Polymer Testing,2013,32(5):987-994.
[8]ZUO Xiaoling,ZHANG Kaizhou,LEI Yang,et al.Influence of thermooxidative aging on the static and dynamic mechanical properties of long-glass-fiber-reinforced polyamide-6 composites[J].Journal of Applied Polymer Science,2014,131(3):1023-1031.
[9]梁惠霞,张东红,张云霄,等.汽车用增韧尼龙6的热氧老化研究[J].工程塑料应用,2009,37(9):71-74.
[10]李维义,王飞,王浩江,等.尼龙6的盐雾和湿热稳定性研究[J].合成材料老化与应用,2016,45(4):43-45.
[11]SHU Ying,YE Ling,YANG Tao.Study on the long-term thermal-oxidative aging behavior of polyamide-6[J].Journal of Applied Polymer Science,2010,110(2):945-957.