Synthesis and characterisation of polyethylene graft copolymers

2017-10-23T11:03:29Z (GMT) by Mohammad Azam
Graft copolymers based on a non-polar polyethylene backbone and polar poly(methyl methacrylate) (PMMA), poly(phenyl ethyl methacrylate) (PPHETMA) and poly(butyl acrylate) (PBA) side chains were synthesised by non-ionic grafting onto method. Carboxyl terminated prepolymers and hydroxyl group containing backbones were synthesised and characterised separately and then condensed in a common solvent to form a graft copolymer. Carboxyl terminated prepolymers PMMA, PPHETMA and PBA of molar masses in the range of 1400 to 4400 g mol-1 were prepared by free-radical polymerisation using 4, 4-azobis (4-cyanovaleric acid) (ACVA) as initiator and thioglycollic acid (TGA) as chain transfer agent. Backbones containing hydroxyl groups were synthesised by hydrolysing ethylene-vinyl acetate (EVA) copolymers to ethylene-vinyl alcohol (EVOH) copolymer with a VOH content of 9.8 mole %, with a VOH content of 21 mole % and a partially hydrolysed terpolymer ethylene-vinyl alcohol-vinyl acetate with a VOH content of 8.0 mole %. [Continues.]