功能化纤维素纳米晶，含有阳离子和温敏聚合物刷。
Functional cellulose nanocrystals containing cationic and thermo-responsive polymer brushes.
机构信息
Department of Chemistry, College of Science, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam, 31441, Saudi Arabia; Department of Chemical Engineering, Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue, Waterloo, ON, N2L 3G1, Canada.
Department of Chemical Engineering, Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue, Waterloo, ON, N2L 3G1, Canada.
出版信息
Carbohydr Polym. 2020 Oct 15;246:116651. doi: 10.1016/j.carbpol.2020.116651. Epub 2020 Jun 17.
Cationic and thermo-responsive polymer brushes were grafted from the surface of cellulose nanocrystals. Di(ethylene glycol) methyl ether methacrylate (MEOMA) and poly(oligoethylene glycol) methyl ether acrylate (OEGMA) and (2-methacryloyloxyethyl) trimethylammonium chloride (DMC) were grafted from cellulose nanocrystals (CNCs) via free radical polymerization. The CNC-g-POEGMA (CP) possessed a tunable lower critical solution temperature (LCST) of about 50 °C, and cloud point measurements confirmed that the LCST of the nanoparticles could be manipulated within the range of 40-47 °C by adjusting the DMC content. The salt effect was also investigated, and the results revealed a typical salting-out effect for the CNC-g-POEGMA after the introduction of KCl. On the other hand, the CNC-g-POEGMA-g-DMC (CPD) copolymers displayed two salt-responsive characteristics; polyelectrolyte effect at lower salt concentrations, followed by the salting-out effect at higher salt concentrations, which is dependent on the DMC content.
阳离子和温敏聚合物刷从纤维素纳米晶体表面接枝。二（乙二醇）甲基醚甲基丙烯酸酯（MEOMA）和聚（聚乙二醇）甲基醚丙烯酸酯（OEGMA）和（2-甲基丙烯酰氧乙基）三甲基氯化铵（DMC）通过自由基聚合从纤维素纳米晶体（CNC）接枝。CNC-g-POEGMA（CP）具有可调节的下临界溶液温度（LCST）约 50°C，浊点测量证实通过调整 DMC 含量可以在 40-47°C 的范围内控制纳米颗粒的 LCST。还研究了盐效应，结果表明在引入 KCl 后，CNC-g-POEGMA 表现出典型的盐析效应。另一方面，CNC-g-POEGMA-g-DMC（CPD）共聚物显示出两种盐响应特性；在较低盐浓度下表现出聚电解质效应，然后在较高盐浓度下表现出盐析效应，这取决于 DMC 的含量。
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