Morphology, rheology and electrical resistivity of PLLA/HDPE/CNT nanocomposites: Effect of maleic anhydride
Morphology, rheology and electrical resistivity of PLLA/HDPE/CNT nanocomposites: Effect of maleic anhydride
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DOI：
10.1016/j.matchemphys.2014.12.020
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发表时间：
2015-02
影响因子：
4.6
通讯作者：
Linbo Shao;Jie Chen;Jian S. Dai;Hai-ming Chen;Jing‐hui Yang;Yong Wang;Chao-liang Zhang
中科院分区：
文献类型：
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作者：
Linbo Shao;Jie Chen;Jian S. Dai;Hai-ming Chen;Jing‐hui Yang;Yong Wang;Chao-liang Zhang
作为调节碳纳米管（CNTs）在非混相聚合物共混物中选择性位置的系列工作的一部分，本工作报道了组分极性和组分之间的粘度比对CNTs的选择性位置和由此产生的纳米复合材料的电阻率的影响。为了达到研究目的，将马来酸酐（MA）通过反应络合工艺接枝到聚l-丙交酯（PLLA）主链上。之后，将不同含量的CNTs掺入高密度聚乙烯（HDPE）和PLLA（或PLLA-g- ma）共混物中。利用扫描电镜（SEM）和透射电镜（TEM）对三元复合材料的形貌和CNTs在纳米复合材料中的选择性位置进行了表征。通过流变学测试进一步验证了纳米复合材料的微观结构和CNTs的分散性。最后，测量了不同碳纳米管含量的纳米复合材料的电阻率。结果表明，通过提高PLLA的极性和降低熔体粘度，CNTs在共混界面区被动力学捕获；因此，pla -g- ma /HDPE/CNT纳米复合材料的渗透阈值大大降低。并对其形态变化和流变性能进行了比较分析。
As a part of serial work about tuning the selective location of carbon nanotubes (CNTs) in immiscible polymer blends, this work reports the effects of component polarity and viscosity ratio between components on the selective location of CNTs and the resultant electrical resistivity of the nanocomposites. To achieve the research aim, maleic anhydride (MA) was grafted onto poly(l-lactide) (PLLA) main chain through a reactive compounding processing. After that, different contents of CNTs were incorporated into blends of high density polyethylene (HDPE) and PLLA (or PLLA-g-MA). The morphologies of the ternary nanocomposites and the selective location of CNTs in the nanocomposites were characterized using scanning electron microscope (SEM) and transmission electron microscope (TEM). The microstructure of nanocomposites and the dispersion of CNTs were further proved by rheological measurement. Finally, the electrical resistivity of nanocomposites containing different CNT contents was measured. The results showed that through increasing the polarity of PLLA and decreasing the melt viscosity, CNTs were kinetically trapped at the blend interface region. Consequently, largely decreased percolation threshold was achieved for the PLLA-g-MA/HDPE/CNT nanocomposites. The morphological changes as well as the rheological properties were also comparatively analyzed.