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首页> 外文期刊>Journal of Materials Chemistry: An Interdisciplinary Journal dealing with Synthesis, Structures, Properties and Applications of Materials, Particulary Those Associated with Advanced Technology >Novel triblock copolymers comprising a polyrotaxane middle block flanked by PNIPAAm blocks showing both thermo- and solvent-response
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Novel triblock copolymers comprising a polyrotaxane middle block flanked by PNIPAAm blocks showing both thermo- and solvent-response

机译：新型的三嵌段共聚物，其包含聚轮烷中间嵌段，两侧为PNIPAAm嵌段，显示出热响应和溶剂响应

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摘要

Two kinds of polyrotaxane (PR)-based triblock copolymers were synthesized via the in situ ATRP of NIPAAm initiated by self-assemblies of β- and γ-cyclodextrins (CDs) with a distal 2-bromopropionyl end-capped poly(propylene glycol) bis(2-aminoproyl ether) in water at 25 °C. The structure was characterized in detail by ~1H NMR, FTIR, WXRD and GPC techniques. The number of entrapped CDs was found to be tunable by varying the molar feed ratios. Their thermo-responsive and self-aggregation behavior in aqueous solution were demonstrated by turbidity measurements and TEM observations, respectively. Furthermore, solvent treatments were carried out on these copolymers. As evidenced by WXRD analyses, they also exhibit a solvent-response by aggregating or dispersing the CDs along the central PPG chain, in which both β- and γ-CDs entrapping copolymers give a typical channel-type crystal structure after water treatment, while the β-CD based ones produce a dispersed state structure and the γ-CD derived ones yield a novel mosaic crystal structure after DMF treatment with anhydrous ether. Here the key to the solvent-response is the coverage ratio rather than the type of CD. Given their thermo-responsive behavior in aqueous solution and their unique solvent-response, these PR-based triblock copolymers show great potential to be used as smart materials for controlled drug delivery systems, molecular detectors, and the like.
机译：通过以β-和γ-环糊精（CD）与末端2-溴丙酰基末端封端的聚（丙二醇）bis的自组装引发的NIPAAm的原位ATRP，合成了两种基于聚轮烷（PR）的三嵌段共聚物（2-氨基丙醚）在25°C的水中。通过〜1H NMR，FTIR，WXRD和GPC技术对结构进行了详细表征。通过改变摩尔进料比，发现截留的CD的数量是可调节的。分别通过浊度测量和TEM观察证明了它们在水溶液中的热响应性和自聚集行为。此外，对这些共聚物进行了溶剂处理。正如WXRD分析所证明的，它们还通过沿中心PPG链聚集或分散CD来表现出溶剂响应，其中截留共聚物的β-和γ-CD均在水处理后产生典型的通道型晶体结构，而基于β-CD的β-CD产生分散状态的结构，而由γ-CD衍生的β-CD产生的结构在无水乙醚DMF处理后产生新颖的镶嵌晶体结构。这里，溶剂响应的关键是覆盖率而不是CD的类型。鉴于它们在水溶液中的热响应行为以及独特的溶剂响应，这些基于PR的三嵌段共聚物显示出巨大的潜力，可用作受控药物输送系统，分子检测器等的智能材料。

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