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        Multi Functionalization of Polypropylene with Controlled Degradation and Its Structure Characterization

        Shuangshuang Wang,Jiruo Zhao,Na Wang,Li Meng,Ying Feng 한국고분자학회 2011 Macromolecular Research Vol.19 No.9

        The multi functionalization of isotactic polypropylenes (iPP) with glycidyl methacrylate (GMA) was carried out by in situ chlorinating graft copolymerization (ISCGC), in which chlorine (Cl2) is used as a radical initiator as well as a radical scavenger. The molecular weight measurement indicates that functionalized iPP with controlled degradation could be obtained because the unstable radicals that induce iPP degradation could be terminated quickly by chlorine. Owing to the unique allyl-containing structure of GMA, multi functionalized iPP could be synthesized under the effect of chlorine, which contained both epoxy groups and C=C double bonds as well as trace amount of chlorine atoms in the functionalized polymer structure. The structure of both the functionalization polymer and homopolymer formed in this system were analyzed by FTIR and ^1H NMR. The mechanism of grafting reaction, iPP chain degradation, and GMA homopolymer formation scheme in ISCGC were proposed. The thermal properties of the functionalized polymer are also discussed.

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        The solvent-free modification of butyl rubber in the medium of NaH

        Ying Feng,Yan Xia Wang,Hong Qi Shao,En Hua Zhang,Zhen Wang,Jiruo Zhao 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.1

        A novel improved butyl rubber (PMIIR) was prepared in a solvent free process, using sodium hydride(NaH) as activating agent and maleic anhydride (MAH) as modifier by processing modificationtechnology in a conventional polymer processing equipment of an internal mixer. The structure ofproducts was characterized by 1H NMR and FT-IR. In this process, polar sodium carboxylate functionalgroup and unsaturated carbon–carbon double bonds were successfully introduced onto the chains of IIRon one step. The reaction mechanism was investigated in detail. It was found that the functionalizationexperienced two modified mechanisms: addition and substitution modified mechanisms. The reactionefficiency and content of MAH were evaluated. Polymer isolation and purification operations werereduced out due to the result of solvent free. Curing and mechanical properties of products wereinvestigated. It was found that PMIIR has greatly increased curing rate due to the incorporation of polargroup and carbon–carbon double bond.

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