Synthesis Of Multi Functionalization Polyethlene By Chlorination In Situ Chlorination Graft Process And Research Of Toughened San Resin

There are the multi-functionalization Polyethylene that is composited by chlorination in situ chlorination graft process and the modified research of toughened (SAN) resin in this paper. The graft copolymer (denoted as CPE-cg-AS) that is chlorinated polyethylene (CPE) as a skeleton, styrene-acrylonitrile copolymer(AS) is a branched chain,the graft copolymer (denoted as CPE-cg-St) that is chlorinated polyethylene (CPE) as a skeleton, styrene (St) is a branched chain by in-situ chlorinating graft technology by High density polyethylene (HDPE). The modified products have many advantages, such as having a polar or rigid group, strength or toughness has improved; compatibility has been improved with SAN resin.The high-performanced CPE graft copolymers are synthesized by chlorination in situ chlorination graft process, and the new polymer materials are obtained by toughened SAN resin. The thesis is divided into two parts; firstly, the copolymers’ characterization is tested by FT-IR, NMR, GPC test methods. According to the characterization of the copolymers’structure, the reaction mechanism of multi-functionalized CPE about in-situ chlorinating graft copolymerization was speculated. The results show that:the functional group is grafted on PE macromer skeleton side chain, and the branched chain Cl substituent destroy the PE molecule chain’s original ordered crystallization, so that the macromolecular chain’s regularity is reduced, and the copolymers have a lower glass transition temperature and the better toughness. There are some factors about the preparation graft copolymers, including the matrix polymer swelling method, segmented temperature grafting method, the reaction temperature, the concentration of the chlorine gas and other factors. The performance of CPE graft copolymers is tested by DSC, DMA and static mechanical properties. The results show that:the CPE graft copolymers have a strong tensile strength and elongation at break and a wider use of temperature than CPEFurthermore, the toughening mechanism about CPE graft copolymer and SAN resin is researched. The results including DSC, DMA, and SEM showed that:the CPE graft copolymers with AS resin blends have better compatibility than the CPE; and we make a reasonable explanation for this result with toughening mechanism. Then, the static mechanical properties results show that the CPE graft copolymers with SAN resin blends have better mechanical properties than the CPE...