| The Vinylidene chloride copolymer resin(PVDC resin) is a kind of copolymer using VDC as the main part, which is prepared through the suspension polymerization usually. Due to the high degree of crystallinity and the dense structure of the Vinylidene chloride copolymer resin itself, PVDC resin was widely used in the packaging industry. In this paper,the author introduced vinylidene chloride(VDC), acrylate(MA) and glycidyl methacrylate(GMA) as comonomer to synthesize VDC-MA-GMA terpolymer resin by suspension polymerization. The suspension polymerization process was investigated Systematically. And the melting and processing properties of the resin were discussed. This study is divided into three parts as follows.Part one: The VDC-MA-GMA terpolymer resin was prepared in a suspension polymerization method with radical polymerization mechanism by using VDC, MA, GMA as comonomer, polyvinyl alcohol and hydroxypropyl methyl cellulose as the dispersant compound, deionized water as a solvent. An orthogonal designing L25(56) was adopted to optimize the polymerization recipe and parameter. The composition and structure of the VDC-MA-GMA terpolymer resinwas were characterized by FTIR, 1H NMR, DSC.Part two: According to the optimum synthesis operation condition based on the L25(56)orthogonal experiment, the Single-factor experiments was conducted by changing only one operation parameter each time to investigate the effects of main operation variables such as monomer ratio, polymerization temperature, polymerization time on the monomer conversion and polymer molecular weight and distribution, particle properties of the resin. Also, the effects of dispersant type and ratio, reaction stirring speed on the particles and morphology of the resin were studied.Part three: The melting and processing properties of the VDC-MA-GMA terpolymer resin were discussed. The effects of copolymerization composition and polymerization temperature on the degree of crystallinity, melting and processing properties were investigated. the glass transition temperature of the resin before and after the copolymerization were characterized by DMA. The theoretical basis and data support for the magnifying production pf the VDC-MA-GMA terpolymer resin were provided. |
PDF Full Text Request