Synthesis and characterization of styrene/butyl acrylate gradient polymers obtained by emulsion polymerization

摘要

The combination of properties at particle level has been accomplished by emulsion polymerization preparing core-shell polymers, to produce stable materials of technological importance. In this work, a change in properties in a more continuous way is sought varying copolymer composition during the second stage of the emulsion polymerization process. Gradient copolymer composition of the system (styrene/butyl acrylate) was followed by IR. Stress-strain, impact and mechanodynamic properties were evaluated. The results were compared with materials of equivalent global composition, obtained in two-stage seeded emulsion polymerization. Performance difference was notorious for certain compositions, showing the gradient materials higher deformation capacity.