Abstract A novel multi stimuli-responsive silica nanocomposite with a core-shell structure is synthesized using reversible addition-fragmentation chain transfer (RAFT) polymerization. The SiO2 nanoparticles are chemically modified via 3-(trimethoxylsilyl) propyl methacrylate (MPS) which they are used in the core of nanocomposite. The macro-RAFT agent is prepared by RAFT polymerization of N-isopropylacrylamide (NIPAM), spirooxazine acryloyl monomer (SOM), and 2-(dodecylthiocarbonothioylthio)-2-methylpropionic acid (DDMAT as a RAFT agent). Finally, the smart nanocomposite is prepared by reaction between the macro-RAFT agent and 2-(Dimethylamino) ethyl methacrylate (DMAEMA) as a monomer. SOM as a photochromic monomer, DMAEMA and NIPAM as temperature and pH sensitive were used in the synthesized nanocomposite. The finally smart nanocomposite was characterized by using FT-IR, 1H NMR, UV–Vis, GPC, DLS, and TEM techniques. The responsiveness of synthesized smart nanocomposite in different conditions (UV–Vis light, pH, temperature and the combination of pH and temperature) was investigated. The results show that the fabricated smart nanocomposite are good candidate nanomaterials for sensors application.

中文翻译：

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RAFT聚合法合成及表征核壳结构多刺激响应嵌段共聚物-二氧化硅杂化纳米复合材料

摘要 采用可逆加成-断裂链转移（RAFT）聚合反应合成了一种具有核壳结构的新型多刺激响应二氧化硅纳米复合材料。SiO2 纳米粒子通过 3-(三甲氧基甲硅烷基) 甲基丙烯酸丙酯 (MPS) 进行化学改性，它们用于纳米复合材料的核心。大分子 RAFT 试剂是通过 N-异丙基丙烯酰胺 (NIPAM)、螺恶嗪丙烯酰基单体 (SOM) 和 2-(十二烷基硫代碳硫酰硫基)-2-甲基丙酸 (DDMAT 作为 RAFT 试剂) 的 RAFT 聚合制备的。最后，通过macro-RAFT剂与作为单体的2-(二甲氨基)甲基丙烯酸乙酯(DMAEMA)反应制备智能纳米复合材料。SOM 作为光致变色单体，DMAEMA 和 NIPAM 作为温度和 pH 敏感材料用于合成的纳米复合材料。最终的智能纳米复合材料通过使用 FT-IR、1H NMR、UV-Vis、GPC、DLS 和 TEM 技术进行表征。研究了合成的智能纳米复合材料在不同条件（UV-Vis 光、pH、温度以及 pH 和温度的组合）下的响应性。结果表明，所制备的智能纳米复合材料是用于传感器应用的良好候选纳米材料。