Abstract
A novel system by using spherical high-density polyethylene (HDPE) and meso-carbon microbeads (MCMB) to regulate the positive temperature coefficient (PTC) effect is studied, and the elastic styrene-butadiene rubber (SBR) is used as the matrix. This HDPE-MCMB/SBR composite (HMSC) is constructed by a simple solution mixing method. The PTC intensity (PTCI) of HMSC with 1 wt% MCMB (HMSC-1) achieves three orders of magnitude (its value is 3.39) in the low-temperature range (20 °C to 90 °C), and HMSC-1 also shows fantastic PTCI reproducibility during the repeated temperature cycles from −20 °C to 90 °C. The high PTC effect is mainly caused by the collaborative combination of the expansion effect of HDPE spheres and the elasticity of SBR. The excellent stability during the temperature cycle mainly stems from the elastic effect of composite, rather than being destroyed during the temperature cycle. Meanwhile, HMSC-1 has good mechanical properties.
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