Abstract
Abstract Conductive elastomer materials based on carbon black (CB) filled bromo-isobutylene-isoprene rubber (BIIR)/polypropylene (PP) thermoplastic vulcanizate (TPV) were prepared by two step method and one step method. The microstructure, mechanical properties, electrical resistivity, thermal stability, electromagnetic interference shielding performance, and fracture surface morphology of composite materials were studied. The result shows the serious aggregation of CB in one-step TPV, but the uniform dispersion of CB in two-step TPV. In addition, the two-step TPV shows a higher electromagnetic interference (EMI) shielding performance and lower conductivity penetration threshold. The penetration threshold of the two-step TPV is 9.1%, and the maximum reflection loss of the two-step TPV16 is −29.5 dB. Therefore, this research offers an uncomplicated and scalable melt mixing approach method to manufacture conductive thermoplastic vulcanizates with excellent EMI shielding.
Highlights
Polymer blends and polymer composites are widely used in various applications due to their excellent mechanical properties [1, 2]
3 Results and discussion crosslinking of bromo-isobutylene-isoprene rubber (BIIR) nanodroplets occur simultaneously in the two-step method, this facilitates the dispersion of carbon black (CB) in the composite material, while the larger BIIR particles in the one-step method hinder the dispersion of CB
This is because the cured BIIR has a higher viscosity ratio than PP, these phenomena are consistent with Wu et al.’s report on the preferential position of CB in the PP matrix in thermoplastic vulcanizate (TPV) composites [38]
Summary
Polymer blends and polymer composites are widely used in various applications due to their excellent mechanical properties [1, 2]. Thermoplastic vulcanizate (TPV) is a kind of thermoplastic elastomer prepared by a dynamic vulcanization method, which consists of a high content cross-linked rubber phase as a diffused phase dispersed in a low content continuous thermoplastic phase to form a “sea-island structure” [22] This structural feature gives TPV good processing properties of thermoplastics and excellent resilience of conventional vulcanized rubber [23, 24]. Conductive elastomer materials based on CB filled bromo-isobutylene-isoprene rubber (BIIR)/polypropylene (PP) thermoplastic vulcanizate were prepared by two step method and one step method, to obtain composite materials with lower percolation threshold, good mechanical properties and EMI shielding effectiveness, to adapt to the actual low-cost industrial production process. Both the two-step method and the one-step method TPV exhibit good electrical properties when the CB content is 20%, but the two-step method TPV has a lower conductivity percolation threshold and better electromagnetic shielding performance
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