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首页> 外文期刊>Polymer: The International Journal for the Science and Technology of Polymers >Melt mixed PCL/MWCNT composites prepared at different rotation speeds: Characterization of rheological, thermal, and electrical properties, molecular weight, MWCNT macrodispersion, and MWCNT length distribution
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Melt mixed PCL/MWCNT composites prepared at different rotation speeds: Characterization of rheological, thermal, and electrical properties, molecular weight, MWCNT macrodispersion, and MWCNT length distribution

机译：在不同转速下制备的熔融PCL / MWCNT混合复合材料：流变，热和电性能，分子量，MWCNT宏观分散和MWCNT长度分布的表征

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摘要

Composites of poly(caprolactone) (PCL) and 0.5 wt.% multiwalled carbon nanotubes (MWCNT) were prepared by melt-mixing in a conical twin-screw micro-compounder by varying the rotation speed between 25 and 400 rpm at constant mixing time and temperature. The state of dispersion analyzed by light microscopy was improved with increasing rotation speed but levels off starting at about 100 rpm. PCL molecular weight as well as crystallization and melting behavior did show only insignificant difference when varying the rotation speed. Concerning melt rheological properties, storage modulus G′ and complex viscosity η* at 0.1 rad/s increased up to a rotation speed of about 75 rpm illustrating improved dispersion. When further increasing the speed G′ and η* decreased which was attributed to more pronounced nanotube shortening as quantified by TEM measurements. Both effects - improved dispersion and nanotube shortening - are also reflected in the electrical resistivity values of compression molded samples which show a minimum of resistivity at the rotation speed of 75 rpm corresponding to a specific mechanical energy input of 0.47 kWh/kg.
机译：聚己内酯（PCL）和0.5 wt。％的多壁碳纳米管（MWCNT）的复合材料是通过在恒定的混合时间和25 rpm至400 rpm之间改变转速在锥形双螺杆微复合物中熔融混合而制得的温度。通过光学显微镜分析的分散状态随着旋转速度的提高而改善，但从约100 rpm开始趋于平稳。当改变转速时，PCL分子量以及结晶和熔融行为的确显示出很小的差异。关于熔体的流变性质，在0.1rad / s下的储能模量G'和复数粘度η*增大至约75rpm的旋转速度，这表明分散性得到改善。当进一步增加速度时，G'和η*降低，这归因于通过TEM测量定量的更显着的纳米管缩短。这两种效果-改善的分散性和纳米管的缩短-也反映在压模样品的电阻率值上，该值在75 rpm的转速下对应于0.47 kWh / kg的比机械能输入时显示出最小的电阻率。

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