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Simultaneously improved electromagnetic interference shielding and mechanical performance of segregated carbon nanotube/polypropylene composite via solid phase molding
Composites Science and Technology ( IF 9.1 ) Pub Date : 2017-12-27
Hong-Yuan Wu, Li-Chuan Jia, Ding-Xiang Yan, Jie-feng Gao, Xiao-Peng Zhang, Peng-Gang Ren, Zhong-Ming Li

Conductive polymer composite with segregated structure has been well demonstrated to achieve high electromagnetic interference shielding effectiveness (EMI SE) due to the selectively distributed electrical nanofillers to establish desirable conductive networks. Nevertheless, the formation of segregated structure in low-melt-viscosity semi-crystalline polymer is still challenged and the segregated composite always suffers poor mechanical performance. Herein, elevated pressure and temperature were utilized to make a typical semi-crystalline polymer, polypropylene (PP), hold solid phase to restrict the diffusion of carbon nanotube (CNT) into its interior. Segregated CNT networks were facilely constructed in the resultant CNT/PP composite and imparted it with a superior EMI SE of 48.3 dB at 2.2 mm thickness and 5.0 wt% CNT loading, the highest EMI shielding level among the reported CNT/polymer composites at equivalent material thickness and CNT loading. Moreover, the elevated pressure and temperature effect dramatically increase the compressive, tensile, and flexural strength (modulus) of the CNT/PP composite by 133% (65%), 74% (130%) and 53% (50%), respectively, in comparison to those for conventional segregated CNT/PP composite, really overcoming the major mechanical shortcoming in the development of segregated composites for EMI shielding. Our work provides a facile strategy to fabricate the efficient EMI shielding and robust material with the construction of typical segregated structure in low-melt-viscosity semi-crystalline polymers.



中文翻译:

通过固相成型同时改善了分离的碳纳米管/聚丙烯复合材料的电磁干扰屏蔽和机械性能

具有隔离结构的导电聚合物复合材料已得到充分证明,由于选择性分布的电纳米填料可建立理想的导电网络,因此可实现高电磁干扰屏蔽效果(EMI SE)。然而,在低熔点粘度的半结晶聚合物中偏析结构的形成仍然受到挑战,并且偏析的复合材料总是遭受较差的机械性能。在此,利用升高的压力和温度来制造典型的半结晶聚合物聚丙烯(PP),其保持固相以限制碳纳米管(CNT)向其内部的扩散。易于在最终的CNT / PP复合材料中构建隔离的CNT网络,并在2.2 mm的厚度和5.0 wt%的CNT负载下赋予其48.3 dB的卓越EMI SE,在相同的材料厚度和CNT负载下,所报道的CNT /聚合物复合材料中的EMI屏蔽级别最高。此外,升高的压力和温度效应分别显着提高了CNT / PP复合材料的抗压强度,抗张强度和挠曲强度(模量),分别提高了133%(65%),74%(130%)和53%(50%)。与传统的隔离式CNT / PP复合材料相比,确实克服了用于EMI屏蔽的隔离式复合材料开发中的主要机械缺陷。我们的工作提供了一种简便的策略,可通过在低熔点粘度的半结晶聚合物中构建典型的隔离结构来制造有效的EMI屏蔽和坚固的材料。升高的压力和温度效应显着提高了CNT / PP复合材料的压缩,拉伸和弯曲强度(模量),分别为133%(65%),74%(130%)和53%(50%)。与传统的隔离式CNT / PP复合材料相比,确实克服了用于EMI屏蔽的隔离式复合材料开发中的主要机械缺陷。我们的工作提供了一种简便的策略,可通过在低熔点粘度的半结晶聚合物中构建典型的隔离结构来制造有效的EMI屏蔽和坚固的材料。升高的压力和温度效应显着提高了CNT / PP复合材料的压缩,拉伸和弯曲强度(模量),分别为133%(65%),74%(130%)和53%(50%)。与传统的隔离式CNT / PP复合材料相比,确实克服了用于EMI屏蔽的隔离式复合材料开发中的主要机械缺陷。我们的工作提供了一种简便的策略,可通过在低熔点粘度的半结晶聚合物中构建典型的隔离结构来制造有效的EMI屏蔽和坚固的材料。确实克服了用于EMI屏蔽的隔离复合材料开发中的主要机械缺陷。我们的工作提供了一种简便的策略,可通过在低熔点粘度的半结晶聚合物中构建典型的隔离结构来制造有效的EMI屏蔽和坚固的材料。确实克服了用于EMI屏蔽的隔离复合材料开发中的主要机械缺陷。我们的工作提供了一种简便的策略,可通过在低熔点粘度的半结晶聚合物中构建典型的隔离结构来制造有效的EMI屏蔽和坚固的材料。

更新日期:2017-12-27
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