Controlled/living radical polymerization of isoprene and butadiene in emulsion
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- 作者：Gabriela Bar-Nes ; Radford Hall ; Vikashni Sharma ; Marianne Gaborieau ; David Lucas ; Patrice Castignolles ; Robert G. Gilbert
- 关键词：Emulsion polymerization ; Barrier products ; RAFT ; Isoprene ; Butadiene ; Nanophase separation
- 刊名：European Polymer Journal
- 出版年：2009
- 出版时间：November 2009
- 年：2009
- 卷：45
- 期：11
- 页码：3149-3163
- 全文大小：803 K
文摘
A process for RAFT-controlled radical polymerization in emulsion [36] has been applied to the polymerizations of isoprene and of butadiene in emulsion systems, with the goal of producing latex particles containing block copolymers of acrylic acid (stabilizer and starting polymer), styrene (second polymer) and isoprene or butadiene (third polymer). The microstructure of the polymer chains was examined using dual-detection size-exclusion chromatography, and the nanostructure of the materials was investigated by differential scanning calorimetry and solid-state nuclear magnetic resonance. Reactions were always slow (although faster than the corresponding processes in solution), and exhibited limited reinitiation by isoprene when in emulsion. The materials containing isoprene exhibit a nanostructure with a phase separation into high-Tg polystyrene-rich domains and low-Tg polyisoprene-rich domains, revealed by DSC and NMR. This has the potential to lead to barrier materials with novel physical properties.