Enhancing electrical characteristics and electromagnetic interference shielding effectiveness in thermoplastic elastomeric polymer blends by utilizing the selective distribution of conductive black

Functional Composite Materials Pub Date : 2024-04-01 DOI:10.1186/s42252-024-00053-7

Sreeja Nath Choudhury, Jasomati Nayak, Palash Das, Aparajita Pal, Ankur Katheria, Pallab Banerji, Narayan Ch. Das

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Abstract

The selective distribution of filler within polymer blends presents a compelling advantage, notably manifesting as a reduced percolation threshold when compared to an individual polymer matrix with a random filler dispersion. In this context, a thermoplastic elastomeric (TPE) blend comprising ethylene propylene diene rubber (EPDM) and linear low-density polyethylene (LLDPE), denoted as EL, has been meticulously formulated. The incorporation of varying amounts of conductive carbon black (Vulcan XC 72; VCB) into this TPE matrix has been achieved through conventional melt blending, yielding a composite material with exceptional electromagnetic interference (EMI) shielding effectiveness of -27.80 dB at 50 phr (parts per hundred rubber). This success is credited to the creation of a linked structure resulting from a dual-step percolation process. The selective distribution of carbon black (CB) throughout the TPE mixture results in a decreased critical concentration for connectivity and enhanced electromagnetic interference (EMI) shielding performance. This advancement underscores the potential of EPDM-LLDPE-VCB (ELV) composites to safeguard against electromagnetic radiation. It paves the way for their utilization in various techno-commercial applications, where a balance of mechanical strength, thermal stability, and flexibility is crucial.

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利用导电黑的选择性分布增强热塑性弹性体聚合物混合物的电气特性和电磁干扰屏蔽效果

聚合物共混物中填料的选择性分布具有令人信服的优势，与具有随机填料分散的单个聚合物基体相比，这种优势主要表现为降低了渗流阈值。为此，我们精心配制了一种由乙丙橡胶（EPDM）和线性低密度聚乙烯（LLDPE）组成的热塑性弹性体（TPE）混合物，简称 EL。通过传统的熔融混合工艺，在这种热塑性弹性体基体中加入了不同数量的导电碳黑（Vulcan XC 72; VCB），从而产生了一种复合材料，在 50 phr（百分之一橡胶）的条件下，其电磁干扰（EMI）屏蔽效果达到-27.80 dB。这一成功归功于双步渗滤工艺所产生的连接结构。炭黑（CB）在整个热塑性弹性体混合物中的选择性分布降低了连接的临界浓度，增强了电磁干扰（EMI）屏蔽性能。这一进展凸显了 EPDM-LLDPE-VCB (ELV) 复合材料抵御电磁辐射的潜力。这为它们在各种商业技术应用中的应用铺平了道路，在这些应用中，机械强度、热稳定性和柔韧性之间的平衡至关重要。

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Functional Composite Materials

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