【摘要】：碳納米管具有優(yōu)異的力學(xué)性能,并同時(shí)具有極高的導(dǎo)熱性能和導(dǎo)電性能;氮化硼的化學(xué)性質(zhì)比較穩(wěn)定,是導(dǎo)熱性能最好的陶瓷材料之一。本課題通過(guò)在聚合物基體中添加碳納米管和氮化硼混雜粒子,制備出力學(xué)性能和熱導(dǎo)率同時(shí)提高的高密度聚乙烯改性復(fù)合材料。本課題首先以高密度聚乙烯為基體材料,以碳納米管和氮化硼顆粒為導(dǎo)熱填料,通過(guò)熔融共混法制備了導(dǎo)熱聚乙烯復(fù)合材料;研究了碳納米管和氮化硼顆粒的配比和添加量對(duì)復(fù)合材料力學(xué)性能、熱導(dǎo)率、熔體質(zhì)量流動(dòng)速率、耐熱性、熔融結(jié)晶性能和熱穩(wěn)定性的影響。結(jié)果表明,當(dāng)碳納米管和氮化硼質(zhì)量比為1:1時(shí),復(fù)合材料熱導(dǎo)率最高;當(dāng)碳納米管和氮化硼含量均為10%時(shí),復(fù)合材料的熱導(dǎo)率提高了62.6%(測(cè)試溫度100℃);混雜導(dǎo)熱填料不僅提高了復(fù)合材料的熱導(dǎo)率,而且提高了復(fù)合材料的拉伸強(qiáng)度、彎曲強(qiáng)度和熱穩(wěn)定性。采用高密度聚乙烯和聚丙烯為基體材料,以碳納米管和氮化硼顆粒為導(dǎo)熱填料,通過(guò)熔融共混法制備了導(dǎo)熱聚乙烯/聚丙烯復(fù)合材料;研究了聚乙烯和聚丙烯不同配比對(duì)復(fù)合材料力學(xué)性能和熱導(dǎo)率的影響,單一填料氮化硼對(duì)復(fù)合材料力學(xué)性能、熱導(dǎo)率、熔體質(zhì)量流動(dòng)速率、耐熱性、熱穩(wěn)定性和熔融結(jié)晶性能的影響,同時(shí)探究了碳納米管和氮化硼顆粒的配比對(duì)聚乙烯/聚丙烯復(fù)合材料力學(xué)性能、熱導(dǎo)率、熔體質(zhì)量流動(dòng)速率、耐熱性的影響。結(jié)果表明:復(fù)合材料的熱導(dǎo)率隨聚丙烯含量的增加而降低;氮化硼可以明顯提高復(fù)合材料的拉伸強(qiáng)度、彎曲強(qiáng)度、熱導(dǎo)率和熱穩(wěn)定性;當(dāng)碳納米管和氮化硼質(zhì)量比為7:3時(shí),復(fù)合材料熱導(dǎo)率最高,與不加導(dǎo)熱填料的復(fù)合材料相比提高了30.5%(測(cè)試溫度100℃)。以高密度聚乙烯為基體、碳納米管為導(dǎo)熱填料,通過(guò)熔融共混法和溶液共混法制備了高密度聚乙烯/碳納米管導(dǎo)熱復(fù)合材料;研究了碳納米管添加量和尺寸對(duì)復(fù)合材料力學(xué)性能、熱導(dǎo)率、耐熱性和熔體質(zhì)量流動(dòng)速率的影響,并對(duì)比了兩種制備方法對(duì)復(fù)合材料力學(xué)性能和熱導(dǎo)率的影響。結(jié)果表明:隨著導(dǎo)熱填料碳納米管用量的增加,復(fù)合材料的拉伸強(qiáng)度、彎曲強(qiáng)度和熱導(dǎo)率均有明顯改善;直徑大的碳納米管更有利于復(fù)合材料傳熱性能和綜合力學(xué)性能的提升;加入10%的碳納米管后,復(fù)合材料的拉伸強(qiáng)度、彎曲強(qiáng)度和熱導(dǎo)率分別提高了33.4%、36.3%和52.6%(測(cè)試溫度60℃);采用熔融共混法制備的復(fù)合材料的性能提高更明顯。
[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，

本文編號(hào)：2269800