Effects of poly(vinyl pivalate)-based stabiliser architecture on CO2-solubility and stabilising ability in dispersion polymerisation of N-vinyl pyrrolidone

Literature Information

Publication Date 2013-05-16
DOI 10.1039/C3PY00275F
Impact Factor 5.582
Authors

Natasha A. Birkin, Oliver J. Wildig, Steven M. Howdle


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Abstract

We report the comparison of block and statistical copolymers of poly(vinyl pivalate) (PVPi), synthesised via RAFT polymerisation, as hydrocarbon stabilisers for use in dispersion polymerisations in CO2. Block copolymer stabilisers are synthesised, and their relative effectiveness in terms of solubility and stabilising ability is compared to statistical copolymer equivalents. The effect of stabiliser molecular weight on dispersion polymerisation of poly(N-vinyl pyrrolidone) PNVP in scCO2 is also explored. Finally, the RAFT end-group incorporated into the stabiliser is completely removed using radical-induced reduction to produce a hydrogen-capped stabiliser in order to investigate the significance of the xanthate in the final stabiliser structure, and whether this component plays a key role in anchoring to the growing polymer particles in scCO2.

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