Synthesis of Branched Copolymers of Poly(1-hexene-co-maleic anhydride)

Abstract

Poly(1-hexene-co-maleic anhydride) was synthesized by addition polymerization of 1:1 of 1-hexene and maleic anhydride using 1% benzoyl peroxide as initiator. The copolymer has been branched by different lengths of linear alkyl groups (C11-C22) via melt process esterification reaction with aliphatic alcohols using 1% para toluene sulfonic acid as catalyst. The prepared copolymers were purified and characterized by FTIR and NMR spectroscopy. All analyses indicate ring-opening reaction of anhydride group constituted backbone chains with aliphatic alcohols, which confirm the validity of the proposed chemical structures of copolymers. Molecular weight determination was confirmed by GPC and end group analysis (ASTM D1386-98) and found that 1-hexene monomer constitutes the largest portion in poly(1-hexene-co-maleic anhydride) backbone.

Synthesis and Characterization of Novel Terpolymers as Viscosity Index Improvers Using Industrial Waste for Iraqi Lubricating Oil

“…Meanwhile, two peaks at 1149 and 1250 cm −1 represent C-O bond stretching of ester groups [10,39]. The absence of the C=C peak at 1680−1600 cm −1 , which is characteristic of monomers, confirms the terpolymer formation, and polymerization was accomplished [11,[40][41][42].…”