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Synthesis, Properties and Application of HDPE Grafted MAH VIA In-Situ Chlorinating Grafting Copolymerization

Author: MaYanQing
Tutor: ZhaoJiRuo
School: Qingdao University of Science and Technology
Course: Materials Science
Keywords: Chlorinated graft Anhydride - modified Structure Performance Plywood adhesive
CLC: O631.3
Type: Master's thesis
Year: 2009
Downloads: 26
Quote: 0
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Abstract


In this thesis chloride in situ graft copolymer (ISCGC) anhydride groups modified , synthesis of high-density polyethylene (HDPE) HDPE as the backbone polymer , maleic anhydride (MAH) for graft branched graft copolymer, whose name is the polyvinyl chloride graft maleic anhydride ( PE - cg- MAH ) . The reaction process is not necessary to add any of the initiators, the decomposition of chlorine to the chlorine radical initiator HDPE grafting reaction to give the anhydride -functionalized polyethylene graft polymer . The structural characterization by means of FT-IR and 1H-NMR on purified anhydride group product of PE-cg-MAH proved MAH grafted onto the HDPE in the molecular main chain , and chlorinated graft method the anhydride groups modified the feasibility of HDPE . And speculated that the the HDPE in situ graft MAH chloride reaction course . The measurement results show that the gel content and molecular weight of a graft polymer of PE-cg-MAH Chloride situ grafting process , there is no cross-linking reaction occurs and the molecular weight degradation . The crystallization behavior of the graft polymer by DSC and X-ray analysis, the results showed that the introduction of the of MAH monomer in HDPE main chain on , so that the decline in the degree of crystallinity of the HDPE , but not the extent of decline . Also investigated the impact of factors on reaction time, temperature , chlorine gas flow , MAH monomer amount of graft polymer grafting rate , as an indication of the the MAH graft HDPE chloride process . In addition, the morphology of the fracture surface with a scanning electron microscope (SEM) of the polymer tensile observed , characterized relative of HDPE , PE - cg- MAH of improved compatibility . Also study and compare the mechanical properties of the grafted polymer PE-cg-MAH , hydrophilic-lipophilic properties , thermal stability , and dynamic mechanical properties . And the effects of changes in the factors that affect the mechanical properties of the graft polymers . The final graft polymer PE-cg-MAH application . Preparing a formaldehyde-free plywood adhesives , and to explore the structure of the binder , and examines the impact of change plywood bonding strength factors . The results show that with the use of the graft polymer of PE-cg-MAH as plywood adhesive , and its bonding strength can be achieved class I plywood standard .

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Polymer physics and physical chemistry of polymers > The chemical nature of polymers
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