Nitroxide-Mediated Radical Polymerization in Microemulsion (Microemulsion NMP) of n-Butyl Acrylate

作者：Tomoeda Seita; Kitayama Yukiya; Wakamatsu Junpei; Minami Hideto; Zetterlund Per B; Okubo Masayoshi^*

来源：Macromolecules, 2011, 44(14): 5599-5604.

DOI：10.1021/ma200859s

Nitroxide-mediated radical polymerization (NMP) in microemulsion (microemulsion NMP) of n-butyl acrylate (BA) has been carried out at 100 degrees C using N-tert-butyl-N-(1-diethylphosphono-2,2-dimethylpropyl) nitroxide (SG1), 2,2'-azoisobutyronitrile (AIBN), and the cationic emulsifier tetradecyltrimethylammonium bromide (TTAB). At [SG1](0)/[AIBN](0) of 1.68 (molar ratio), the polymerization exhibited classical trend marks of a controlled/living system with the molecular weight distribution (MWD) shifting to higher molecular weights with increasing conversion and a linear increase in number-average molecular weight (M-n) vs conversion. Bulk NMP carried out under the same conditions (without water and TTAB) proceeded at an extremely high rate without control/livingness. From these results, it is concluded that the confined space effect (compartmentalization) operates in the microemulsion NMP; in other words, it is a useful tool to prepare nanosized monomer-solubilized micelles for regulation and improvement of NMP.

• 出版日期2011-7-26