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将不同体积分数的定向碳纳米管(A-MWNT)通过溶液共混的方法填充到天然橡胶中,经过室温交联硫化,得到A-MWNT填充的天然橡胶复合材料。对比普通非定向碳纳米管(MWNT),观察了A-MWNT在天然橡胶基体中的分散情况,研究了A-MWNT对橡胶复合材料玻璃化转变温度(Tg)、高温交联放热和导热性能的影响,并进行了机理分析。研究表明:A-MWNT在与天然橡胶溶液共混过程中经超声波振荡和搅拌后会被部分打乱。但是在微区单元内是定向的,在整体上呈非定向。随着A-MWNT填充量的增加,Tg逐渐下降后又有回升之势,高温交联固化放热逐渐增大,复合材料的导热率较之同条件下MWNT填充的复合材料的导热率大,且增长速度较快,在填充分数为10%时,导热率跃增到0.735 W/(m·K),增加了222.4%。
A-MWNT filled natural rubber composites were obtained by filling different kinds of oriented carbon nanotubes (A-MWNTs) into natural rubber by solution blending and cross-linking curing at room temperature. Compared with ordinary non-oriented carbon nanotubes (MWNTs), the dispersion of A-MWNTs in natural rubber matrix was observed. The effects of A-MWNTs on the glass transition temperature (Tg), crosslinking exotherm and thermal conductivity The impact, and conducted a mechanistic analysis. The results show that A-MWNT will be partially disrupted by ultrasonic vibration and stirring during the blending with natural rubber solution. But is directional within the microdomains unit and non-directional as a whole. With the increase of the filling amount of A-MWNT, the Tg decreases gradually and then rises again, and the exothermic cross-linking curing increases gradually. The thermal conductivity of composites is higher than that of MWNT filled composites under the same conditions, And the growth rate is faster. At a filling fraction of 10%, the thermal conductivity jumped to 0.735 W / (m · K), an increase of 222.4%.