A series of aggregation-induced emission (AIE) active core crosslinked miktoarm star copolymers, having multi polyethylene (PE) and poly(methacrylic acid) (PMAA) arms, were synthesized and their thermal/pH responsive properties were studied. The procedure involves (a) the synthesis of PE-Br by polyhomologation of dimethylsulfoxonium methylide with triethylborane as initiator, followed by oxidation-hydrolysis/esterification reactions and of poly(tert-butyl methacrylate) (PtBMA-Br) by atom transfer radical polymerization (ATRP) of tert-butyl methacrylate, (b) the synthesis of (PE)_n-(PtBMA)_m-P(TPE-2St) by ATRP of a double styrene-functionalized tetraphenylethene (TPE-2St) with PE-Br and PtBMA-Br macroinitiators, and (c) the hydrolysis of (PE)_n-(PtBMA)_m-P(TPE-2St) to afford the amphiphilic miktoarm star copolymers (PE)_n-(PMMA)_m-P(TPE-2St). Due to their spherical core–shell structure (temperature-responsive) and the presence of hydrophilic PMAA (pH-responsive) and TPE-2St (AIE), these miktoarm star copolymers are AIE materials with temperature/pH-dual responsivity. In addition, thanks to the coexistence of hydrophilic and hydrophobic arms, these materials promote stable water-in-oil emulsions.

中文翻译：

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温度和 pH 值双响应 AIE 活性核心交联聚乙烯-聚（甲基丙烯酸）Multimiktoarm Star 共聚物

合成了一系列具有多聚乙烯（PE）和聚（甲基丙烯酸）（PMAA）臂的聚合诱导发射（AIE）活性核心交联的miktoarm星形共聚物，并研究了它们的热/pH响应特性。该过程包括 (a) 通过以三乙基硼烷为引发剂的二甲基亚砜鎓甲基化物的多同系化合成 PE-Br，然后通过原子转移自由基进行氧化-水解/酯化反应和聚（甲基丙烯酸叔丁酯）（P t BMA-Br）甲基丙烯酸叔丁酯的聚合 (ATRP) ，(b) (PE) _n -(P t BMA) _m的合成-P(TPE-2St) 由双苯乙烯官能化四苯基乙烯 (TPE-2St) 与 PE-Br 和 P t BMA-Br 大分子引发剂的 ATRP，和 (c) (PE) _n的水解-(P t BMA) _m -P(TPE-2St) 得到两亲性 miktoarm 星形共聚物 (PE) _n -(PMMA) _m -P(TPE-2St)。由于它们的球形核壳结构（温度响应）和亲水性 PMAA（pH 响应）和 TPE-2St (AIE) 的存在，这些 miktoarm 星形共聚物是具有温度/pH 双响应性的 AIE 材料。此外，由于亲水臂和疏水臂的共存，这些材料促进了稳定的油包水乳液。