Synthesis of Sterically-Stabilized Polystyrene Latexes Using Well-Defined Thermoresponsive Poly(N-isopropylacrylamide) Macromonomers
Synthesis of Sterically-Stabilized Polystyrene Latexes Using Well-Defined Thermoresponsive Poly(N-isopropylacrylamide) Macromonomers
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DOI：
10.1021/ma2016584
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发表时间：
2011-09
期刊：
影响因子：
5.5
通讯作者：
J. R. McKee;V. Ladmiral;J. Niskanen;H. Tenhu;S. Armes
中科院分区：
文献类型：
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作者：
J. R. McKee;V. Ladmiral;J. Niskanen;H. Tenhu;S. Armes
通过可逆加成-断裂链转移（RAFT）聚合、氨解和亲核Michael加成反应合成了一系列具有温敏性的聚N-异丙基丙烯酰胺（PNIPAM）大分子单体。使用2-（十二烷基硫代羰基硫代）-2-甲基丙酸-2-苯氧基乙酯（CTA）作为RAFT链转移剂以制备目标聚合度为20、30、40、50、60和75的六种PNIPAM-CTA前体。这些NIPAM聚合在1，4-二氧六环中进行，并以良好的控制和低多分散性（Mw/Mn < 1.10）进行，直至超过90%的转化率。然后通过在一锅反应中使用双官能试剂甲基丙烯酸3-（丙烯酰氧基）-2-羟丙酯（AHPMA）组合（i）氨解和（ii）亲核迈克尔加成将PNIPAM三硫代碳酸酯端基转化为甲基丙烯酸酯端基。评价所得PNIPAM大分子单体作为胶乳合成的反应性空间稳定剂。近单分散亚微米粉体
A series of well-defined thermo-responsive poly(N-isopropylacrylamide) (PNIPAM) macromonomers was prepared by reversible addition–fragmentation chain transfer (RAFT) polymerization followed by aminolysis and nucleophilic Michael addition. 2-(Dodecylthiocarbonothioylthio)-2-methylpropanoic-2-phenoxyethyl ester (CTA) was used as the RAFT chain transfer agent to prepare six PNIPAM-CTA precursors with target degrees of polymerization of 20, 30, 40, 50, 60, and 75. These NIPAM polymerizations were conducted in 1,4-dioxane and proceeded with good control and low polydispersities (Mw/Mn < 1.10) up to more than 90% conversion. The PNIPAM trithiocarbonate end-groups were then converted to methacrylate end-groups by combining (i) aminolysis and (ii) nucleophilic Michael addition using the bifunctional reagent, 3-(acryloyloxy)-2-hydroxypropyl methacrylate (AHPMA), in a one-pot reaction. The resulting PNIPAM macromonomers were evaluated as reactive steric stabilizers for latex syntheses. Near-monodisperse submicromet...