Polyethylene-g-polystyrene (PE-g-PS) was synthesized as a compatibilizer for polypropylene/polystyrene (PP/PS) blends by the living radical polymerization of styrene with polyethylene-co-glycidylmethacrylate (PEco-GMA). The compatibilizer effect of PE-g-PS on the morphology and thermal properties of PP/PS blends was investigated. The crystalline temperature of PP in PP/PS blends decreased with increasing PE-g-PS contents. Morphologies of PP/PE-g-PS/PS blends showed much better dispersion of each domain for higher PE-g-PS contents. The molecular weight of PS segment in PP/PEg-PS/PS blend was increased by addition of styrene monomer during the post melt blending process where post living radical polymerization reaction proceeded.PE-g-PS as a Compatibilizer for PP/PS Blends / 61 FIGURE 4. Microphotographs of PP/PS (70/30 wt/wt %) blends (a) without compatibilizer, (b) with 5 phr compatibilizer, and (c) with 10 phr compatibilizer, respectively.
PMMA nanoparticles with highly mono-dispersed size distribution were prepared using the RAFT living radical emulsion polymerization technique. A novel suriniferter for the RAFT reaction, DTBA, was synthesized and its chemical structure was identified using several spectroscopic techniques. The relationship between the particle size and the molecular weight of the polymer was investigated measuring the rate of growth of each during formation of particles, and was well explained by the simple random flight molecular conformation model. The particle size increased up to a certain value with decreasing sur-iniferter concentration and then leveled off, because the surface charge density of the growing particles was not high enough to stabilize the particles in aqueous medium above that value. The core-shell type di-block copolymer nanoparticles were also successfully prepared via RAFT reaction.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.