导热聚乙烯复合材料的制备及性能研究
发布时间：2018-10-13 20:30
【摘要】：碳纳米管具有优异的力学性能,并同时具有极高的导热性能和导电性能;氮化硼的化学性质比较稳定,是导热性能最好的陶瓷材料之一。本课题通过在聚合物基体中添加碳纳米管和氮化硼混杂粒子,制备出力学性能和热导率同时提高的高密度聚乙烯改性复合材料。本课题首先以高密度聚乙烯为基体材料,以碳纳米管和氮化硼颗粒为导热填料,通过熔融共混法制备了导热聚乙烯复合材料;研究了碳纳米管和氮化硼颗粒的配比和添加量对复合材料力学性能、热导率、熔体质量流动速率、耐热性、熔融结晶性能和热稳定性的影响。结果表明,当碳纳米管和氮化硼质量比为1:1时,复合材料热导率最高;当碳纳米管和氮化硼含量均为10%时,复合材料的热导率提高了62.6%(测试温度100℃);混杂导热填料不仅提高了复合材料的热导率,而且提高了复合材料的拉伸强度、弯曲强度和热稳定性。采用高密度聚乙烯和聚丙烯为基体材料,以碳纳米管和氮化硼颗粒为导热填料,通过熔融共混法制备了导热聚乙烯/聚丙烯复合材料;研究了聚乙烯和聚丙烯不同配比对复合材料力学性能和热导率的影响,单一填料氮化硼对复合材料力学性能、热导率、熔体质量流动速率、耐热性、热稳定性和熔融结晶性能的影响,同时探究了碳纳米管和氮化硼颗粒的配比对聚乙烯/聚丙烯复合材料力学性能、热导率、熔体质量流动速率、耐热性的影响。结果表明:复合材料的热导率随聚丙烯含量的增加而降低;氮化硼可以明显提高复合材料的拉伸强度、弯曲强度、热导率和热稳定性;当碳纳米管和氮化硼质量比为7:3时,复合材料热导率最高,与不加导热填料的复合材料相比提高了30.5%(测试温度100℃)。以高密度聚乙烯为基体、碳纳米管为导热填料,通过熔融共混法和溶液共混法制备了高密度聚乙烯/碳纳米管导热复合材料;研究了碳纳米管添加量和尺寸对复合材料力学性能、热导率、耐热性和熔体质量流动速率的影响,并对比了两种制备方法对复合材料力学性能和热导率的影响。结果表明:随着导热填料碳纳米管用量的增加,复合材料的拉伸强度、弯曲强度和热导率均有明显改善;直径大的碳纳米管更有利于复合材料传热性能和综合力学性能的提升;加入10%的碳纳米管后,复合材料的拉伸强度、弯曲强度和热导率分别提高了33.4%、36.3%和52.6%(测试温度60℃);采用熔融共混法制备的复合材料的性能提高更明显。
[Abstract]:Carbon nanotubes have excellent mechanical properties as well as extremely high thermal conductivity and conductivity. Boron nitride is one of the best thermal conductivity ceramic materials because of its stable chemical properties. By adding carbon nanotubes (CNTs) and boron nitride (BN) hybrid particles into the polymer matrix, a high density polyethylene (HDPE) modified composite with both mechanical properties and thermal conductivity was prepared. In this paper, high density polyethylene (HDPE) was used as matrix material and carbon nanotubes (CNTs) and boron nitride (BN) particles as thermal conductive fillers. The effects of the ratio of carbon nanotubes and boron nitride particles on the mechanical properties, thermal conductivity, melt mass flow rate, heat resistance, melt crystallization properties and thermal stability of the composites were studied. The results show that when the mass ratio of carbon nanotubes to boron nitride is 1:1, the thermal conductivity of the composites is the highest, and when the content of carbon nanotubes and boron nitride is 10, The thermal conductivity of the composite is increased by 62.6% (test temperature 100 鈩，
本文编号：2269800
[Abstract]:Carbon nanotubes have excellent mechanical properties as well as extremely high thermal conductivity and conductivity. Boron nitride is one of the best thermal conductivity ceramic materials because of its stable chemical properties. By adding carbon nanotubes (CNTs) and boron nitride (BN) hybrid particles into the polymer matrix, a high density polyethylene (HDPE) modified composite with both mechanical properties and thermal conductivity was prepared. In this paper, high density polyethylene (HDPE) was used as matrix material and carbon nanotubes (CNTs) and boron nitride (BN) particles as thermal conductive fillers. The effects of the ratio of carbon nanotubes and boron nitride particles on the mechanical properties, thermal conductivity, melt mass flow rate, heat resistance, melt crystallization properties and thermal stability of the composites were studied. The results show that when the mass ratio of carbon nanotubes to boron nitride is 1:1, the thermal conductivity of the composites is the highest, and when the content of carbon nanotubes and boron nitride is 10, The thermal conductivity of the composite is increased by 62.6% (test temperature 100 鈩，
本文编号：2269800
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