Noncovalent modification of self‐assembled functionalized COF by PNIPAM and its properties of Pickering emulsion,Journal of the Chinese Chemical Society

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Noncovalent modification of self‐assembled functionalized COF by PNIPAM and its properties of Pickering emulsion
Journal of the Chinese Chemical Society ( IF 1.6 ) Pub Date : 2020-05-07 , DOI: 10.1002/jccs.202000089
Na Zhang ₁ , Fei Wang ₁ , Chang‐chen Cai ₁ , Qian Sun ₁ , Kai Zhang ₁ , Ai‐xiang Li ₁ , Jun‐ying Weng ₁ , Qiu‐hong Li ₁

Affiliation

Based on a facile and universal method using noncovalent bonding, here, polymer‐modified covalent organic framework materials (COFs) were rapidly prepared. PNIPAM‐modified COF (COF‐PNIPAM) was synthesized by electrostatic self‐assembly between COF prepared by low‐cost melamine and terephthalaldehyde and carboxyl‐terminated poly(N‐isopropylacrylamide) (PNIPAM) prepared via reversible addition‐fragmentation chain transfer polymerization. The carboxyl‐terminated PNIPAM was characterized by Gel Permeation Chromatography and Ultraviolet and Visible Spectroscopy (UV–vis). COF and COF‐PNIPAM were characterized by Fourier Transform Infrared Spectroscopes, Scanning Electron Microscope, Transmission Electron Microscope, X‐Ray Diffractomer (XRD), and Brunner‐Emmet‐Teller (BET) measurements. The results showed that the COF‐PNIPAM was successfully prepared. The Pickering emulsion properties of the COF‐PNIPAM in a water‐to‐toluene mixed system were studied, and when the water‐to‐oil ratio is 2:1, a stable emulsion can be obtained. However, the results show that the PNIPAM chains of COF‐PNIPAM nearly lose their temperature responsiveness.

中文翻译：

PNIPAM对自组装官能化COF的非共价修饰及其Pickering乳液的性能

基于使用非共价键的简便通用方法，此处可以快速制备聚合物改性的共价有机骨架材料（COF）。PNIPAM改性的COF（COF-PNIPAM）是通过低成本三聚氰胺和对苯二甲醛制得的COF与羧基封端的聚（N通过可逆加成-断裂链转移聚合反应制备的（-异丙基丙烯酰胺）（PNIPAM）。羧基封端的PNIPAM的特征在于凝胶渗透色谱，紫外可见光谱（UV-vis）。COF和COF-PNIPAM的特征在于傅立叶变换红外光谱仪，扫描电子显微镜，透射电子显微镜，X射线衍射仪（XRD）和Brunner-Emmet-Teller（BET）测量。结果表明，COF-PNIPAM已成功制备。研究了水-甲苯混合体系中COF-PNIPAM的Pickering乳液性能，当水油比为2：1时，可以获得稳定的乳液。但是，结果表明，COF-PNIPAM的PNIPAM链几乎失去了其温度响应能力。

更新日期：2020-05-07

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