Chemical and physical properties of self-crosslinked poly(vinyl chloride)/nitrile rubber nanocomposites prepared by melt-mixing process
Chemical and physical properties of self-crosslinked poly(vinyl chloride)/nitrile rubber nanocomposites prepared by melt-mixing process
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DOI：
10.1515/polyeng.2011.024
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发表时间：
2011-07
期刊：
影响因子：
19.6
通讯作者：
E. Esmizadeh;G. Naderi;M. Ghoreishy;G. Bakhshandeh
中科院分区：
文献类型：
--
作者：
E. Esmizadeh;G. Naderi;M. Ghoreishy;G. Bakhshandeh
摘要本文采用计算机化的Brabender塑分仪对聚氯乙烯（PVC）/丁腈橡胶（NBR）/粘土纳米复合材料进行了熔融共混。在纳米复合材料的制备过程中，发生自交联（不借助任何交联剂的交联）并影响样品的所有性质。交联反应的程度取决于加工温度、转子转速和混炼温度，且随各混炼参数的增大而增大。通过傅立叶变换红外光谱测试研究了自交联反应的机理。利用X射线衍射仪和扫描电子显微镜对材料的形貌进行了表征。通过溶胀试验和拉伸试验研究了自交联现象对NBR/PVC纳米复合材料物理性能的影响。动态力学热分析测试的纳米复合材料也进行了研究的物理性能，如玻璃化转变温度（Tg）。结果表明，交联反应使材料强度提高，模量和拉伸强度提高。因此，可以推断，交联将NBR/PVC纳米复合材料转化为较难被溶剂渗透的较硬材料。从纳米复合材料样品的损耗角正切（tan δ）曲线得出的结果可以用作上述结论的进一步证据。
Abstract In this article, poly(vinyl chloride) (PVC)/acrylonitrile butadiene rubber (NBR)/clay nanocomposites were melt-mixed using the computerized Brabender plasticorder. During preparation of the nanocomposites self-crosslinking (crosslinking without aid of any crosslinking agent) occurs and affects all properties of a sample. The extent of crosslinking reaction depends on the processing temperature, rotor speed and mixing temperature and it increased with increasing each of mixing parameters. The mechanism of the self-crosslinking reaction was examined by the Fourier transform infrared spectroscopy test. The morphology of the materials was characterized using X-ray diffraction and scanning electron microscope. The swelling test and tensile test were applied to distinguish the effects of self-crosslinking phenomena on physical properties of NBR/PVC nanocomposites. Dynamic mechanical thermal analysis tests of nanocomposites were also performed to study the physical properties, such as glass transition temperature (T g). The results showed that the crosslinking reaction made a material more strong with high modulus and tensile strength. Thus, it can be deduced that crosslinks convert the NBR/PVC nanocomposites to stiffer materials that are less penetrable by the solvent. The results drawn from the loss tangent (tan δ) curves of nanocomposite samples can be used as further evidence for the above conclusions.