Photomediated atom transfer radical polymerization (photoATRP) of (meth)acrylic monomers was conducted in miniemulsion media. The polymerization procedures took advantage of an ion-pair catalyst formed by interaction of Cu/TPMA² (TPMA = tris(2-pyridylmethyl)amine) and an anionic surfactant, sodium dodecyl sulfate (SDS). The ion-pair catalyst was efficient in controlling ATRP reactions with catalyst loadings as low as 100 ppm. The effect of different polymerization parameters, such as the size of the reaction vial, amount of surfactant, and solids content influencing the photoATRP in miniemulsion, was studied. The polymerization was conducted with solids content ranging from 5 to 50 vol % under a moderate surfactant loading (<5 wt % relative to monomer). Excellent temporal control was achieved upon switching the UV light on and off multiple times, and the polymer was successfully chain extended, indicating high retention of chain-end fidelity.

中文翻译：

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光致微乳液原子转移自由基聚合

(甲基)丙烯酸单体的光介导原子转移自由基聚合 (photoATRP) 在细乳液介质中进行。聚合过程利用了由 Cu/TPMA ^{2相互作用形成的离子对催化剂}（TPMA = 三（2-吡啶基甲基）胺）和阴离子表面活性剂十二烷基硫酸钠 (SDS)。离子对催化剂可有效控制催化剂负载量低至 100 ppm 的 ATRP 反应。研究了不同聚合参数的影响，例如反应瓶的大小、表面活性剂的量和固体含量对细乳液中 photoATRP 的影响。在中等表面活性剂负载（相对于单体<5 wt%）下以5-50 vol%的固体含量进行聚合。多次打开和关闭紫外灯后实现了出色的时间控制，并且聚合物成功扩链，表明链端保真度保持高。