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[摘要]：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. |
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