Preparation of cyciopentyi trisiianoi siisesquioxanes - modified natural rubber (CpSSQ(OH)3 - ENR-50) composite hybrid in the presence of HCI acid

Abstract

A composite comprising cyclopentyl trisilanol siisesquioxanes (CpSSQ(OH)3) and 50% epoxidized natural rubber (ENR-50) was prepared at reflux temperature employed hydrochloric acid (HCl) as catalyst. HCl was found to be an effective catalyst to promote ring opening reaction of ENR-50 and tailored CpSSQ(OH)3 to the ENR-50 polymer chains via chemical reaction. FTIR spectroscopy reveals a hydroxyl stretching indicating the occurrence of epoxide ring opening reaction. !H NMR analysis further proved the incorporation of CpSSQ(OH)3 into ENR-50 polymer chains via shiftment of proton chemical shift and addition in the proton integrals. Si 29NMR analysis evidence the Si-O-C bond through a chemical shift of silanol group from CpSSQ(OH)3.