Preparation and Characterization of Polystyrene Particles Having Phosphonium Groups

SHIMIZU Hidenobu, KAWASHIMA Yuka, WADA Risei, OKABE Masaru

doi:10.1295/koron.64.35

Soap-free emulsion polymerization of styrene (St) was investigated in the presence of phophonium-containing monomer, i.e., tributyl-4-vinylbenzyl phosphonium chloride (VBPC). The kinetics of polymerization and the particle size of the resulting latexes were studied by varying VBPC concentration in the feed. The monomer conversions were followed by a gravimetric method, which revealed that the rate of polymerization increased 5.7 times by adding VBPC at a concentration as low as 0.1 wt% with respect to St monomer. The higher concentration of VBPC, however, hardly affected the polymerization rate. According to the particle size measurement by transmission electron microscopy, increasing the VBPC concentration from 0 to 6.0 wt% caused the particle size to decrease from 316 to 45 nm. The number of particles remained almost constant during the polymerization, indicating that the particles are formed at the early stage of polymerization and the formation of secondary particles is unlikely to take place in the later stage. The amount of phosphonium groups introduced into the particles increased linearly with an increase in the VBPC concentration.<br>

Preparation and Characterization of Polystyrene Particles Having Phosphonium Groups

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