Synthesis, Properties And Application Of PVC Grafted MAH Via In-Situ Chlorinating Grafting Copolymerization

A novel method, in-situ chlorinating graft copolymerization (ISCGC), was employed to synthesize grafting copolymers of chlorinated polymers. Chlorine radicals which derived from the decomposed chlorine were used as initiators, and the grafting reaction of polymers with the monomers in system occurred along with the proceeding of chlorinating of the polymers. Chlorinated polymers with grafting different monomers will display different properties, such as hydrophilicity, hydrophobicity, plasticization, reactivity, compatibility with other polymers, processability and so on.In this article, PVC was modified via ISCGC method. It is simultaneous that PVC were chlorinated and the PVC radicals initiated the grafting copolymerization of maleic anhydride (MAH) onto PVC backbone. Then the Chlorinated PVC were functionalized by MAH, and the resulting product was the copolymer of chlorinated poly(vinyl chloride) and MAH (CPVC-g-MAH). The graft product was characterized by FT-IR and ¹H-NMR after separated and purified. CPVC-g-MAH were confirmed by the absorption peak at 1728.65cm^-1 in FT-IR spectrum which was attributed to the carbonyl group(C=O) of MAH and the peaks at δ=5⁵.5ppm in ¹H-NMR spectrum which was attributed to the protons of MAH. Furthermore, the effects of reaction temperature, monomer content, reaction time, swelling time, DOP content, chlorine flow on grafting degree and mechanical properties of CPVC-g-MAH were investigated. It shows that the optimal grafting conditions were reaction temperature 120°C; reaction...