Study On Preparation And Properities Of Polyacrylate Grafting Vinyl Chloride By Suspension And Elementary Enlarging Experiment

two kinds of cross-linked polyacrylate (ACR) latices with relatively narrow distribution of particle diameters, which are abbreviated to P(BA-EHA) (ACR I) and P(BA-EHA)/P(MMA-St) (ACR II), were synthesized by seeded emulsion co-polymerization, respectively. Butyl acrylate and 2-ethylhexy! acrylate were used as comonomers of ACR core, styrene and methyl methacrylate were employed as comonomers of ACR shell, and 1,4-butanediol diacrylate was used as cross-linking agent. In the presence of ACR I or ACR II latex, two kinds of copolymerization resin , including ACR I /PVC and ACR II /PVC, were prepared by grafting co-polymerization with vinyl chloride in an autoclave, respectively. The size and distribution of ACR latex was determined by dynamic laser scattering and TEM. The results indicated that when styrene content of shell in ACR II is bigger than 70 percent of shell by weight, the latex particles have irregular core-shell morphological structure as sandwich.The grafting situation in the copolymerization resin was characterized through FTIR and solvent extraction for the copolymerization resin. The grafting efficiency (GE) of ACR I or ACR II grafting VC in the copolymerization resin was investigated, and GE increases with increasing ratio of ACR I or ACR II and VC. Average molecular weight of PVC in the copolymerization resin was determined by viscometer.The influence of the effecting factors of the synthesized ACR on the mechanical properties of copolymerization resin were investigated in detail,and also they were compared with PVC and ACR blend. The various properties of copolymerization resin and materials made out of it, such as dynamic mechanical property; thermal property, Vicat softening temperature, rheological behavior morphological structure and the broken profile of the materials, were determined and characterized withthe aid of DMA TA-2000 type thermal analyzer XWB-300F type detector of Vicat softening temperature, capillary rheometer TEM SEM, respectively. The effects of amount of ACR on the mechanical properties of the materials were investigated. The notched impact strength increases dramatically with increasing ACR content, meantime the tensile strength of the materials somewhat decreases. DMA results reveal that the compatibility between ACR and PVC has been well improved. The mechanical loss peak of copolymerization resin in low temperature region is stronger than that of pure PVC. Further, the maximum value of the loss peak gradually shifts to higher temperature with increasing P(BA-EHA) content. TEM shows that rubbery phase is much uniformly dispersed in PVC matrix. The interface between two phases was indistinct. SEM shows that the fractured surface of the notched sample has a very good toughness. The notched impact strength of the P(BA-EHA)-g-VC material with 6.3% P(BA-EHA) was eleven times that of PVC.Vicat softening temperature of copolymerization resin decreases slightly with increasing ACR content. The rate of weight losses of copolymerization resin decreases with increasing ACR content. The thermal stability of the composite resin increases. Because of addition of ACR, mobility of copolymerization resin becomes better than that of pure PVC.The synthesis of ACR latices were enlarged, and they were grafted with vinyl chloride, results indicate the copolymerization resin has better modified effect and steady properties .In addition, the main design parameters of a 1m3 autoclave were designed, it made an preparation for enlarging experiment of suspension copolymerization.