Effects of poly(vinyl pivalate)-based stabiliser architecture on CO2-solubility and stabilising ability in dispersion polymerisation of N-vinyl pyrrolidone
Effects of poly(vinyl pivalate)-based stabiliser architecture on CO2-solubility and stabilising ability in dispersion polymerisation of N-vinyl pyrrolidone
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DOI：
10.1039/c3py00275f
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发表时间：
2013-01-01
影响因子：
4.6
通讯作者：
Howdle, Steven M.
中科院分区：
文献类型：
--
作者：
Birkin, Natasha A.;Wildig, Oliver J.;Howdle, Steven M.
我们报告的聚（新戊酸乙烯酯）（PVPi），通过RAFT聚合合成的嵌段和统计共聚物的比较，作为用于在CO2中的分散聚合的烃类稳定剂。合成嵌段共聚物稳定剂，并将其在溶解度和稳定能力方面的相对有效性与统计共聚物当量进行比较。还探讨了稳定剂分子量对聚（N-乙烯基吡咯烷酮）PNVP在scCO（2）中的分散聚合的影响。最后，使用自由基诱导的还原完全除去结合到稳定剂中的RAFT端基，以产生氢封端的稳定剂，以研究黄原酸酯在最终稳定剂结构中的重要性，以及该组分是否在scCO中锚定到生长的聚合物颗粒中起关键作用（2）。
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 scCO(2) 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 scCO(2).