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Noncovalent modification of self‐assembled functionalized COF by PNIPAM and its properties of Pickering emulsion
Author(s) -
Zhang Na,
Wang Fei,
Cai Changchen,
Sun Qian,
Zhang Kai,
Li Aixiang,
Weng Junying,
Li Qiuhong
Publication year - 2020
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.202000089
Subject(s) - pickering emulsion , chemistry , chemical engineering , polymer chemistry , emulsion , melamine , emulsion polymerization , covalent bond , fourier transform infrared spectroscopy , polymer , polymerization , scanning electron microscope , copolymer , covalent organic framework , materials science , organic chemistry , composite material , engineering
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.