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Abstract
In this work the effect of cyclic butylene terephthalate (CBT) was studied on the curing, rheological, morphological and mechanical properties of styrene butadiene rubber (SBR), oil extended styrene butadiene rubber (oSBR), acrylonitrile butadiene rubbers (NBR) with various acrylonitrile (AN) content and a carboxylated acrylonitrile butadiene rubber (XNBR). The effect of CBT on the oil resistance of the NBR and XNBR based compounds was also investigated. Viscosities of the uncured compounds were significantly decreased by CBT and it also acted as a semi-active filler, effectively reinforcing the tested rubbers, therefore it is suggested to be a bifunctional additive for tested rubbers. CBT also showed to have a positive effect on the oil resistance of NBR compounds.
Highlights
Properties of rubbers can be tailored upon requirements for a wide range of application fields
Results show that in NBR based compounds this effect tends to be more pronounced if the AN content of the base rubber increases, so the interaction between the rubber matrix and cyclic butylene terephthalate (CBT) phase strengthens with increasing CBT content
Maximum values of the loss factor decreased in all compounds, and the peaks were shifted to higher temperatures, it can be stated, that molecular segment mobility was hindered by CBT
Summary
Properties of rubbers can be tailored upon requirements for a wide range of application fields. This work is devoted to study the effect of unpolymerizable CBT variant (i.e. without a catalyst) on the rheological, mechanical and morphological properties of SBR, oil-extended SBR (oSBR) and NBR compounds (former works [14,15,16] were focused on the polymerizable variant of CBT in HNBR rubber). Among NBR based compounds NBR 39 showed the most promising result, which led to the broadening of the CBT contents of the tested NBR 39 based rubbers.
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