Synthesis And Application Of High-elastic Acrylic Polymer

In this thesis, the preparation and application of acrylate/isoprene copolymers wereresearched. By different comonomer ratio and different preparation methods, copolymersuitable for plastic impact modified was prepared, and copolymer used as processing aidsuitable for not only processing modified, but also impact modified was synthesized. Thesetwo copolymers were used to modify PVC respectively, and the modified effect wasresearched. At the same time, a high elastic acrylate/isoprene copolymer emulsion used asfilm-forming material was developed, elastic coating was made, and the coating compositionratio and performance were worked over. Three parts were described as following.In this study, butyl acrylate (BA), methylmethacrylate (MMA), styrene (ST), isoprene(IP) were used as substrate, acrylic acid (AA) as functional monomer, sodium dodecyl sulfate(SDS) as emulsifier, potassium persulfate (KPS) as initiator, by the core-shell emulsionpolymerization method, isoprene/acrylate copolymers elastomer with elastomer soft-core andhard shell which was used as impact modifier were prepared. Among them, IP and AA werereached respectively by the block copolymer and the graft copolymer. We used the gelfraction and the monomer conversion rate as indicators, examined the impact to elastomer ofthe amount of emulsifier and initiator, the polymerization temperature and time, the amount ofacrylic acid, determined the best polymerization conditions. By infrared spectroscopy thestructure of the copolymer was characterized. We used mechanical properties of blends asindicator, studied the affect of the blending temperature, blending time, the amount ofcopolymer elastomer and the number of filler to the impact strength, the tensile strength andthe elongation at break of PVC blends, determined that the best blend temperature was170℃,the optimal blending time was10min, the best number of copolymer elastomer was10copies.Using the above-mentioned of reactive monomer, isoprene/acrylate copolymers asprocessing aids for plastics were prepared with different monomer ratios and differentpreparation methods. We used intrinsic viscosity, gel fraction, the monomer conversion rate asindicators, examined the affect to polymer molecular weight of the amount of emulsifier, the amount of initiator, polymerization temperature, the number of acrylic acid, determined thebest polymerization conditions and characterized the structure of the copolymer. PVC blendswere prepared, the rheological properties and process ability of the blends were investigated,the flow curve was analyzed, and the mechanical properties of materials were also tested. Theresults showed that processing performance of PVC was improved significantly; the impactresistance was also improved.Using acrylic and isoprene monomer, isoprene/acrylic copolymer emulsion was preparedby emulsion polymerization. Polymer cement coating was prepared with copolymer emulsion,cement and other additives. We used coating elongation, water absorption and solid content asthe main indicators, studied the affect to coating performance of the amount of emulsifier, thenumber of initiator and acrylic acid, the ratio of hard and soft monomers, the amount ofisoprene polymer. We used coating mechanical properties as indicator, studied the affect ofthe amount of cement to the tensile strength and elongation of film, and determined theoptimum reaction conditions: the amount of emulsifier is4.5%, initiator dosage is0.5%, thepolymerization temperature of65℃, the number of acrylic acid was1.5%, the hard and softmonomer ratio of60:40. The results showed that when poly cement ratio was1, the tensilestrength of polymer cement coating is52.20MPa; when the amount of cement was10%, theelongation of polymer cement coating achieved433%.