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首页> 外文期刊>Journal of Applied Polymer Science >Attaining low percolation threshold in conductive polypropylene/nitrile rubber thermoplastic vulcanizates using carbon nanotube
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Attaining low percolation threshold in conductive polypropylene/nitrile rubber thermoplastic vulcanizates using carbon nanotube

机译：使用碳纳米管达到导电聚丙烯/丁腈橡胶热塑性硫化酸盐的低渗透阈值

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摘要

Electrically conductive thermoplastic vulcanizates (TPV) based on polypropylene (PP)/nitrile rubber (NBR) blends loaded with multiwalled carbon nanotube (CNT) were prepared by dynamic vulcanization. CNT was incorporated into the system using two different mixing sequences: (i) one-step method, by adding CNT after the PP and NBR and (ii) two-steps method involving a previous PP/CNT master batch. Scanning electron microscopy and transmission electron microscopy were used to analyze the morphology of the nanocomposites. Dynamic-mechanical analysis and rheological properties were also used for characterizing the TPV and TPE samples. Both mixing strategies favored the location of the CNT inside the PP phase. The one-step approach resulted in a percolation threshold as low as 0.19 vol% with conductivity value of 0.04 S m(-1)for the system loaded with only 0.50 vol% of CNT. The electromagnetic interference shielding effectiveness and microwave absorbing properties were evaluated in the X-band frequency range. The TPV samples prepared by both methods displayed an overall electromagnetic attenuation of around 70%.
机译：采用动态硫化法制备了以聚丙烯（PP）/丁腈橡胶（NBR）共混物为基体的多壁碳纳米管（CNT）导电热塑性硫化胶（TPV）。使用两种不同的混合顺序将CNT纳入系统：（i）一步法，通过在PP和NBR后添加CNT；（ii）涉及先前PP/CNT母料的两步法。扫描电子显微镜和透射电子显微镜用于分析纳米复合材料的形态。动态力学分析和流变性能也用于表征TPV和TPE样品。两种混合策略都有利于CNT在PP相内的位置。对于仅装载0.50 vol%CNT的系统，一步方法导致渗流阈值低至0.19 vol%，电导率值为0.04 S m（-1）。在X波段频率范围内，评估了电磁干扰屏蔽效能和微波吸收性能。两种方法制备的TPV样品显示出约70%的总体电磁衰减。

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