RSC Advances
·
2024
·Vol. 14
·期 8
·5417-5424
·
IF 3.9
Jie Yi,Yajing Yang,Xi-ming Song,Yuxuan Zhang
Azobenzene-containing poly(aryl ether)s are a potential type of photoinduced deformable high-performance polymer. However, research on photoinduced deformation of azobenzene-containing poly(aryl ether)s focuses mainly on poly(aryl ether)s containing azobenzene groups in the main chain. In this paper, the photoinduced deformation of poly(aryl ether)s containing azobenzene groups in the side chain was studied for the first time. Two novel poly(aryl ether)s containing azobenzene groups in the side chain were synthesized, and their photoinduced isomerization behavior and photoinduced deformation behavior were studied. It could be seen that the match of the excitation luminescence to the maximum absorption peak of the azobenzene groups was more compatible, and the photoinduced motion of the polymers was faster. In addition, poly(aryl ether)s containing azobenzene groups in the side chain showed highly stable photoinduced deformation. The results of this work will be helpful for designing polymers which could be controlled by lasers of different wavelengths.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
PubMed
高影响因子
MACROMOLECULAR RESEARCH
·
2019
·Vol. 28
·期 5
·450-454
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IF 1.758
Gu Yiyang,Zhao Zhen,Chao Danming,Liu Xincai
Stimuli-response materials have attracted considerable attention due to their potential applications in sensoring, smart coatings, and intelligent devices. Herein a novel thermo-photo staged response shape memory poly(aryl ether ketone) bearing flexible alkyl segments and azobenzene groups was successfully designed and synthesized. Its chemical structure, thermostability and mechanical properties were characterized through Fourier Transform infrared spectroscopy, nuclear magnetic resonance spectroscopy, thermal gravimetric analysis and dynamic mechanical analysis. The resultant polymer disclosed thermo-/photo-dual stimuli-response behaviors, ascribed to its unique chemical structure. Firstly, the polymer film exhibited good thermal response shape memory effect with satisfied shape fixity ratio ( R f ) and shape recovery ratio ( R r ) (>99%). Moreover, an interesting photo-thermo two-staged responsive shape memory behavior with bending deformation over 100° upon the exposure of ultraviolet light and recovering to its original state through thermal treatment was revealed, attributed to the transcis isomerization of azobenzene groups.
研究领域:
材料科学
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ORGANOMETALLIC CHEMISTRY
·
2018
·
IF 1.946
Amin Khan,Li Wang,Haojie Yu,Muhammad Haroon,Raja Summe Ullah,Ahsan Nazir,Tarig Elshaarani,Muhammad Usman,Shah Fahad,Kaleem-ur-Rehman Naveed
Three novel polymers (P(FHEMA- co -MAAT)s) having redox and photoresponsive moieties were prepared by free radical polymerization . The structures and molecular weights of the synthesized copolymers were characterized by nuclear magnetic resonance ( 1 H NMR) and gel permeation chromatography (GPC) respectively. Thermal properties, optical features and electroactive properties were studied with the help of thermogravimetric (TG), differential thermogravimetric (DTG) analysis, ultraviolet-visible spectroscopy (UV-vis) and cyclic voltammetry (CV). It was seen that synthesized copolymers had excellent redox and photoresponsive properties. These results exhibited that these polymers can be applied further for redox/photo responsive information storage devices.
研究领域:
材料科学
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Zhao Chen,Danhua Xie,Binglei Song,Chaowang Li,Xiaomei Pei,Rong Li
A tetrameric monomer containing an azobenzene group (abbreviated as tetra-N(AZO)-Br) was synthesized in this paper, and a “pseudo” oligomeric surfactant was constructed using tetra-N(AZO)-Br and a traditional surfactant, sodium oleate (SO), by non-covalent bonded interaction. The synthesized tetra-N(AZO)-Br was characterized by 1 H NMR and UV–Vis spectra. The viscoelasticity and the difference in nuclear magnetic resonance (NMR) and ultraviolet (UV) absorption of the SO/tetra-N(AZO)-Br “quasi” tetrameric surfactant solution at different concentrations were investigated. The SO/tetra-N(AZO)-Br “pseudo” tetrameric surfactant could form highly viscoelastic worm-like micelles in solution, and the zero-shear viscosity of the system increased with increasing concentration. The viscoelastic properties of SO/tetra-N(AZO)-Br “pseudo” tetrameric surfactant had no obvious change after UV light irradiation . Since the combination of SO and tetra-N(AZO)-Br molecules was in dynamic equilibrium through the attraction of positive and negative charges, as much as 30% of the trans- tetra-N(AZO)-Br molecules in worm-like aggregates were transformed to their cis- structure. The un-transformed trans- tetra-N(AZO)-Br molecule could move in the aggregate and help maintain the structure of the aggregates, so that the viscosity had no obvious change.
研究领域:
化学
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材料科学
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2019
·Vol. 37
·期 12
·1267-1272
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IF 2.804
Liu Yi-Jun,Liu Dong,Li Si-Han,Liang Hua-Qing,Zhu Fang-Ming
In this study, a novel waterborne polyurethane (WPU) with azobenzene-containing (azo-containing) pendant groups was synthesized by isophorone diisocyanate, long-chain diol of polycaprolactone, 2-ethyl-2-methyl-butanoic acid (2,2-dimethylolpropionic acid), 10-(4-(phenyldiazenyl)phenoxy)decyl-3-hydroxy-2-(hydroxymethyl)-2-methylpropanoate, and N,N -diethyl-ethanamine (triethylamine). Moreover, the influence of ultraviolet and visible (UV-Vis) light irradiation on the viscoelasticity of azo-containing WPU film in terms of the reversible trans-cis photoisomerization of azo-containing pendant groups was investigated by UV-Vis light spectroscopy, atomic force microscopy, and dynamic thermomechanical analysis. The results revealed that the adhesion of azo-containing WPU with single crystal silicon atomic force microscope probe was about 13 nN when irradiated by 450 nm Vis light for 60 s at 25 °C. Subsequently, the adhesion increased to 82 nN after irradiation with 365 nm UV light for 60 s at 25 °C. In addition, the azo-containing WPU presented a photo-induced reversible transition of tensile modulus and tan δ in the range from about 2 MPa to 22 MPa and 6000 to 0.35 with UV-Vis light cyclic irradiation for 120 s at 25 °C, respectively.
研究领域:
材料科学
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高分子化学
✓ 已验证
DOI
高影响因子
POLYMER INTERNATIONAL
·
2020
·Vol. 69
·期 12
·1267-1274
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IF 2.574
Xin Liu,Yanwei Gao,Xuanbo Zhu,Yingshuang Shang,Zengduo Cui,Qixing Yan,Haibo Zhang
Two novel poly(arylene ether sulfone)s with high biphenylene content (BDS-PES and BDS-PDBES) are prepared by nucleophilic substitution polymerization of synthesized 4,4′-bis(4-hydroxyphenyl)diphenyl sulfone (BDS) with 4,4′-sulfonylbis(fluorobenzene) and 4,4-bis[(4-chlorophenyl)sulfonyl], respectively. The prepared polymers show high glass transition temperature and excellent high-temperature mechanical properties. The glass transition temperature of BDS-PDBES with higher biphenylene content is as high as 300 °C, and BDS-PDBES can still maintain its 30% storage modulus at 295 °C. In addition, the two novel polymers also show excellent thermal stability ( T d5 = 526 °C), high elongation at break ( ε ≈ 20%), good tensile strength (73 MPa) and modulus (1.73 GPa) and good thermal conductivity ( λ 300°C = 0.28 W ·m −1 ·K −1 ).
研究领域:
高分子化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE PHENOMENA
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2011
·
IF 0
Xin De Tang,Tie Shi Wang,Ye Chen,Fa Qi Yu,Mei Shan Pei
Novel conjugated polythiophene derivatives with azobenzene moieties to attaching to the polymer backbone via a flexible alkyl spacer were synthesized by electrochemically direct anodic oxidation in boron trifluoride diethyletherate (BFEE). The physical, optical and fluorescent properties of the resulting polymers were characterized. As conducting and optical materials, the polymers can be promising in the field of photoelecrtonics area.
研究领域:
材料科学
·
光电材料
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有机化学
✓ 已验证
DOI
LIQUID CRYSTALS
·
2016
·
IF 2.244
Weikai Zhang,Xiaomei Wang,Dong Wang,Zhou Yang,Hong Gao,Yan Xing,Wanli He,Hui Cao,Huai Yang
Liquid-crystalline blue phases (BPs) are stable only for very narrow temperature range between the isotropic and the chiral nematic phase that severely hinders their applicability. Herein, the aminoazobenzol group was chemically grafted onto epoxy group of graphene oxide (GO) via addition reaction. Successful grafting of aminoazobenzol group was confirmed using X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), UV–vis absorption spectra and thermogravimetric analysis (TGA). The resultant aminoazobenzol group–modified GO sheets, which is reduced (RGO-Az), were easily redispersable in common organic solvents or liquid crystals (LCs). By doping different contents of RGO-Az, nanosheets could stabilise BP and increase the BP range. When doped with 0.5 wt% RGO-Az, the mixtures show the wider range with 5.9°C than the range with 3.6°C of BPLCs without RGO-Az. Meanwhile, the phase sequence and the range of the aforementioned phases are reproducible upon heating and cooling, which shows that the BPs doped with RGO-Az nanosheets are thermodynamically stable.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 134
·期 8
·
IF 1.866
Xiaobing Hu
In this thesis, two novel porous hyperbranched poly(1,3,5-tris(4-carboxyphenyl) benzene p -phenylenediamine) amides with different terminal functional groups are synthesized through an A 2 + B 3 approach using 1,3,5-tri(4-carboxyl phenyl) benzene (H 3 BTB) and p -phenylenediamine as raw material, N -methyl-pyrrolidone as solvent, triphenyl phosphite and pyridine as dehydrating agent, by means of regulating the mole ratio of the monomers. The chemical structures of the prepared hyperbranched polymers are characterized by Fourier transform infrared spectroscopy and nuclear magnetic resonance ( 1 H-NMR and 13 C-NMR) analysis. These two polymers can be soluble in dimethyl sulfoxide (DMSO) and N , N -dimethyl formamide (DMF). Their DMSO solutions exhibit strong blue fluorescence, especially for the amino terminated polymer HP-NH 2 . While in DMF solution, the two polymers emit strong green fluorescence. These two polymers are porous polymers with the Brunauer−Emmett−Teller surface areas of 4.53 and 24.52 m 2 /g for HP-COOH and HP-NH 2 , respectively. They are potential useful in the areas of storage, separation, catalysis, and light emitting. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44505.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
·
2016
·
IF 0.532
Zongcheng Miao,Dong Wang,Hong Gao,Xiaomei Wang,Jianming Gu,Huiying Hu
Liquid-crystalline blue phases are stable only for very narrow temperature range between the isotropic and the chiral nematic phase that severely hinders their applicability. Herein, aminoazobenzol group was chemically grafted onto graphene oxide (GO) via amidization reaction. Successful grafting of aminoazobenzol group was confirmed using X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), UV-vis absorption spectra and Thermogravimetric analysis (TGA). The resultant aminoazobenzol group modified GO sheets which is reduced (GO-Az) were easily redispersed in common organic solvents. By doping different contents of GO-Az nanosheets could stabilize blue phase and increase the blue phase range. When doped with 0.5 wt% GO-Az, the mixtures show the wider range with 5.4°C than the range with 3.6°C of blue phase liquid crystals without GO-Az. Meanwhile, the phase sequence and the range of the aforementioned phases are reproducible upon heating and cooling, which shows that the blue phases doped with GO-Az nanosheets are thermodynamically stable.
研究领域:
材料科学
·
液晶技术
·
化学工程
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2014
·Vol. 25
·期 9
·920-926
·
IF 1.964
Cuihong Zhang,Dongrui Wang,Jin He,Tao Liang,Guo-Hua Hu,Zhi-Min Dang
In this work, self-assembly method was used to improve the dielectric constant of triblock copolymers. A series of ABA triblock copolymers with a defined length of poly(n-butyl acrylate) (PBA, B block) segment and different lengths of liquid crystalline (LC) poly[11-(4-cyano-4′-biphenoxy)undecyl methacrylate] (P11CBMA, A block) segments were synthesized by using the atom transfer radical polymerization method. The well-defined triblock copolymers P11CBMA m - b -PBA n - b -P11CBMA m possess three different B/A ratios ( n = 50, m = 17, 43, 53). Due to the supramolecular cooperative motion effect, the copolymers can form worm-like microstructure ( W LC = 52.8%), cylinder-like nanostructure with P11CBMA phase embedded in PBA matrix ( W LC = 73.9%), and wide stripe structure with LC domains distributed unevenly in a continuous PBA matrix ( W LC = 77.7%) after annealed at 160°C (above T i ) under N 2 for 24 h, respectively. In order to study the influence of microphase separated morphology of triblock copolymer on the dielectric properties, solvent annealing was also used to develop various nanostructures. After thermal or solvent annealing, the dielectric constants of block copolymers increased dramatically while their loss factors remained the same. For different block copolymers, the dielectric constants increased with the increase of the LC block length. For diverse treatments, dielectric permittivities of samples varied widely with different nanostructures. The results show that the dielectric constants of block copolymers could be tuned by the block ratios and the self-assembled microstructures. These findings will inspire researchers using self-assembly method to design and develop novel flexible materials with high dielectric permittivity. Copyright © 2014 John Wiley & Sons, Ltd.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2018
·Vol. 6
·期 16
·2444-2449
·
IF 4.776
Yanan Zhao,Bingqian Lei,Mengfan Wang,Shengtang Wu,Wei Qi,Rongxin Su,Zhimin He
In this study, a peptide-based artificial hydrolase with photo-switchable activity was fabricated by the introduction of a catalytic histidine residue and a photo-responsive azobenzene group into the peptide chain. The peptide exhibits a structural transition from an antiparallel β-sheet to a random coil upon photo-irradiation, leading to the assembly/disassembly of the peptide fibril. An enhanced catalytic activity on p-nitrophenyl acetate was observed due to the proximity effect of the histidine residues and the hydrophobic microenvironment in the supramolecular assemblies. Under UV irradiation, this supramolecular system was destroyed together with a decline in the catalytic activity. Based on these photo-responsive properties, the activity of the hydrolase mimic can be reversibly controlled using UV and visible light. This study provides a new approach for constructing a switchable artificial enzyme based on a peptide material platform.
研究领域:
生物化学
·
分子生物学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）