The Carbon Black-Loaded Styrene-Butadiene Rubber in The Addition of Palmitamide: The Cure Characterization

Abstract

Abstract This study investigated the influences of palmitamide on the cure characterization of carbon black (CB)-loaded styrene-butadiene rubber (SBR). The SBR was loaded with CB at a fixed loading (thirty phr) and the palmitamide was loaded into the CB-loaded SBR compounds with varied doses from two to eight phr. The palmitamide was prepared from the chemical reaction between urea and palmitic acid at an appropriate condition of reaction. The influences of palmitamide additions on the scorch time, cure time and cure rate index/CRI of CB-loaded SBR were investigated. It was examined that the palmitamide caused an enhancement in the rate of the cure process on the SBR compounds. The palmitamide decreased both the times to scorch and cure times but increased the CRI. The bigger the palmitamide doses caused in the lower were the scorch and cure times but caused in the higher was the CRI. The enhancement in CRI was attributed to the role of palmitamide as the supplementary accelerator for the CB-loaded SBR compounds. The amine content of palmitamide enhanced the CRI.