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

In-situ chlorinating graft copolymerization (ISCGC) was employed to modifypoly (vinyl chlorinate) (PVC) in this paper. The product synthesized by PVC wasnamed as CPVC-cg-HEA which was composed of PVC as backbone and 2-hydroxyethyl acrylate (HEA) as branched chains. Chlorine radicals derived from thedecomposed chlorine were used as to initiate grafting and chlorinating reaction in thisproceeding. It can be got for PVC graft copolymer which was functionalized byhydroxyl group without using other initiators.Convincing evidence for grafting and the structure and properties of graftcopolymers was obtained using FT-IR, ¹H-NMR, GPC, DSC, TG in the article.CPVC-cg-HEA after separated and purified was confirmed by the absorption peak at1749cm^-1 in FT-IR spectrum which was attributed to the carbonyl group(C=O) of HEAand the peaks atδ=0.8～1.4ppm in ¹H-NMR spectrum which was attributed to theprotons of -CH₂-CH₂-COO-segment of HEA. A possible mechanism of the reactionbetween PVC and HEA by in-situ chlorinating graft method was proposed. The GPCresult showed that the molecular weight (?)_n and (?)_m were increased and the distributingindex was reduced. The properties of CPVC-cg-HEA, such as relationship between stressand strain, rheological property, hydrophilicity and thermal stability, were studied.Furthermore, the effects of reaction condition, including monomer content, reactiontemperature, chlorine flow, swelling time etc., on mechanical properties ofCPVC-cg-HEA were investigated.In addition, two types of functional polymers with reactive groups,CPVC-cg-HEA and the graft copolymer of chlorinated polyethylene and maleicanhydride (CPE-cg-MAH), were blended replacing CPVC and CPE respectively. It indicates that CPVC-cg-HEA can react to CPE-cg-MAH when they were blended athigh temperature. Compared with CPVC/CPE system, the physical and mechanicalproperties of CPVC-cg-HEA/CPE-cg-MAH changed obviously. When the blendingratio was 10:1 (CPVC-cg-HEA: CPE-cg-MAH), the tensile strength, elongation atbreak, and impact strength increased respectively by 4.9MPa, 27.4%, and 10.6 kJ.m^-2over CPVC/CPE system, and the heat stability of the system enhanced too. But Vicatsoften temperature of CPVC-cg-HEA/CPE-cg-MAH was lower 2.2℃than that ofCPVC/CPE. SEM photographs showed that tensile break surface of CPVC-cg-HEA/CPE-cg-MAH blend had marked toughness characteristic.