Grafting copolymer cylic natural rubber with oleic acid using dicumyl peroxide as initiator

Abstract

The primary focus of this study was to determine the grafting of oleic acid (OA) onto cyclic natural rubber (CNR) using dicumyl peroxide (DCP) as an initiator. The grafting was carried out in a Haake rheometer internal mixer. Influence of OA monomer and DCP initiator concentrations were studied. Determination of the degree of grafting is done by the acid-base titration method. Base on FT-IR data spectra, the peaks at 1712.8 cm-1 show the carbonyl group (C=O), which proves the grafting of OA onto CNR was successfully achieved. The quantities of the grafted OA on CNR molecules was increased with increasing monomer and initiator concentrations. The glass transition (Tg) temperature also increased with increasing the monomer concentration used in the graft copolymerization. The glass transition values CNR increase from 100.4 °C to 115.86 °C, which proves, grafted OA onto CNR was successfully obtained.