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Liu Z.,University of Jinan | Liu Z.,Shandong Key Laboratory of Fluorine Chemistry and Chemical Engineering Materials | Yu Z.,University of Jinan | Zhang J.,University of Jinan | And 2 more authors.
Molecular Crystals and Liquid Crystals | Year: 2016

Two series of new Schiff base compounds were synthesized. For Schiff base compounds with a pyridine nitrogen atom in 4-position (7a-e), their supramolecular hydrogen bonding complexes show good liquid crystal properties. However, no liquid crystal property is observed for 8a-e. Results of theoretical calculations demonstrate that it is the intermolecular hydrogen bond of Schiff base compounds (8a-e) that prevents the formation of supramolecular hydrogen bonding. The Schiff base compounds, with terminal alkoxy chains, can recognize Cu2+ selectively with a color change. Nevertheless, others cannot recognize Cu2+. © 2016 Taylor and Francis Group, LLC.


Liu Z.,University of Jinan | Liu Z.,Shandong Key Laboratory of Fluorine Chemistry and Chemical Engineering Materials | Zhang J.,University of Jinan | Li T.,University of Jinan | And 3 more authors.
Journal of Fluorine Chemistry | Year: 2013

Two new Schiff base compounds, tailed by the fluoroalkoxy, were synthesized in a three-step process. Those supramolecular structures constructed by hydrogen bonding show good liquid crystal properties with higher clear points and wider mesomorphic phase ranges than other analogs containing a terminal alkoxy chain. Investigation of the optical textures by polarizing microscopy reveals that terminal fiuorinated substituents convert the nematic phase of supramolecular hydrogen-bonding complexes with terminal alkoxy chains into the smectic A phase of those with terminal fluoroalkoxy chains. © 2013 Elsevier B.V.


Liu Z.L.,University of Jinan | Liu Z.L.,Shandong Key Laboratory of Fluorine Chemistry and Chemical Engineering Materials | Li X.H.,University of Jinan | Li X.H.,Shandong Key Laboratory of Fluorine Chemistry and Chemical Engineering Materials | And 2 more authors.
Advanced Materials Research | Year: 2014

A new series of supramolecular hydrogen-bonded liquid cryatals complexes were synthesized based on pyridine derivative and 4-n-alkoxybenzoic acids. The formation of hydrogen bonds was verified by infrared spectra. The thermal behavior of supramolecular liquid crystals was studied using differential scanning calorimeter (DSC). The liquid crystal texture was revealed with polarizing optical microscope (POM). It demonstrats that all supramolecular complexes have good liquid crystal properties. © (2014) Trans Tech Publications, Switzerland.


Liu Z.,University of Jinan | Liu Z.,Shandong Key Laboratory of Fluorine Chemistry and Chemical Engineering Materials | Han J.,Dalian Construction School | Zhang J.,University of Jinan | And 7 more authors.
Monatshefte fur Chemie | Year: 2014

A series of fluorinated benzoic acid-pyridine supramolecular liquid crystals and their non-fluorinated analogues were synthesized and studied by use of polarizing optical microscopy (POM), differential scanning calorimetry, and X-ray diffraction. A smectic phase was identified for the fluorine-bearing products, with high clear points, and two peaks (2θ ≈ 6.5, 24) in X-ray diffraction. However, non-fluorinated analogues have a nematic phase with low clear points and one peak (2θ ≈ 23) in X-ray diffraction. This indicates that one trifluoromethyl is able to increase stability and the degree of order of hydrogen-bonded supramolecular liquid crystals. Graphical Abstract: [Figure not available: see fulltext.]. © 2013 Springer-Verlag Wien.


Li G.,University of Jinan | Li G.,Shandong Key Laboratory of Fluorine Chemistry and Chemical Engineering Materials | Li G.,Shandong Engineering Research Center for Fluorinated Material | Xu A.,University of Jinan | And 14 more authors.
Journal of Fluorine Chemistry | Year: 2014

A fluorinated diblock copolymer of methyl methacrylate (MMA) and 2,2,2-trifluoroethyl methacrylate (TFEMA) was prepared by reversible addition-fragmentation chain transfer (RAFT) polymerization in the presence of cumyl dithiobenzoate (CDB) as the chain transfer agent (CTA). 1H NMR spectroscopy, Fourier transform infrared spectroscopy, gel permeation chromatography and different scanning calorimetry were used to characterize the block copolymers obtained. Contact angle measurement indicated that the diblock copolymer has considerable hydrophobicity (θwater = 104.3°) and lipophobicity (θoil = 80.0°). The results are almost the same as those for PTFEMA and superior to those for a random copolymer of MMA and TFEMA. It was also found that P(MMA-b-TFEMA) has high thermostability. The self-assembly behaviour of the copolymer in selective solvents was evaluated by SEM, and stable micelles with a diameter of 400-600 nm were observed when the copolymer content was approximately 0.2 wt.%. Comparison studies with P(MMA-b-TFEMA), PTFEMA and PMMA revealed that the copolymer with a controllable distribution of fluorine atoms possesses a good performance. © 2014 Elsevier B.V.

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