期刊
POLYMER
卷 260, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2022.125373
关键词
Fluorinated; Hydrogen bond; Mesogen-jacketed liquid crystalline polymer; Block copolymer; Self -assembly
资金
- National Key R & D Program of China
- National Natural Science Foundation of China
- [2018YFB0703702]
- [51725301]
- [51921002]
By connecting through hydrogen bonding, we synthesized a new series of fluorinated supramolecular liquid crystalline polymers with good thermal stability. We constructed a series of supramolecular hierarchically ordered self-assembled structures by introducing fluorinated molecules into commercially available copolymer chains. This approach provides a new method for constructing small-sized structures via hydrogen-bonded supramolecular systems.
By connecting a fluorinated molecule 2,5-bis((4-(perfluorohexyl)benzoyl)oxy)benzoic acid (6DFP) to the poly(4-vinylpyridine) (P4VP) backbone through hydrogen bonding, we synthesized a new series of fluorinated supra -molecular mesogen-jacketed liquid crystalline polymer (MJLCP) P4VP(6DFP)x, where x is the molar ratio of donor to acceptor. Polarized light microscopy and wide-angle X-ray scattering were used to investigate the liquid crystallinity of the resulting complexes. The results show that this kind of supramolecular MJLCP has good thermal stability, with the isotropization temperature of about 170 degrees C. Subsequently, by connecting the fluori-nated molecule 6DFP to the commercially available coil-coil block copolymer (BCP) polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) chain also via hydrogen bond, we constructed a series of supramolecular rod-coil BCP PSmVn(6DFP)x, where m and n are the degrees of polymerization of PS and P4VP, respectively. PSmVn(6DFP)x exhibits a hierarchically ordered self-assembled structure. Owing to the introduction of fluorine atoms, the Flory-Huggins interaction parameter (chi) of such a supramolecular BCP is high. BCP sample with a low total degree of polymerization can still be ordered, and the periodic size can be as low as 11.5 nm. This work provides a new approach for the construction of small-sized structures by supramolecular BCPs via hydrogen bonding, which can be used as nanotemplates and nanoporous materials after selective removal of the small molecules.
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