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RISS 인기검색어
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- 저자 : Danming Chao (검색결과 5 건)
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Synthesis and Characteristics of Thermo-Photo Staged-Response Shape Memory Poly(aryl ether ketone)s
Yiyang Gu,Zhen Zhao,Danming Chao,Xincai Liu 한국고분자학회 2020 Macromolecular Research Vol.28 No.5
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 twostaged 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.
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Xiaoteng Jia,Ce Wang,Danming Chao,Libing He,Hongtao Liu,Tian Zheng,Chengcheng Zhang 한국고분자학회 2011 Macromolecular Research Vol.19 No.11
A novel hyperbranched electroactive azo polyamide containing oligoaniline was synthesized by oxidative coupling polymerization. The detailed characteristics of the obtained polyamide were systematically studied by Fourier transform infrared (FTIR) spectra, nuclear magnetic resonance (^1H NMR) spectroscopy, and gel permeation chromatography (GPC). The thermogravimetric analysis (TGA) revealed a good thermal resistance of the polymer. The photoisomerization process and doping process of the polymer were monitored with ultraviolet-visible spectroscopy. Further, the electrochemical behavior of the polymer was explored by cyclic voltammogram (CV), and the mechanism of electrochemical oxidation process was studied in detail. The polymer in the HCl-doped form possessed much higher dielectric constants compared with that of the similar linear polymer reported before, mainly due to the highly branched three-dimensional molecular architecture and the high content of oligoaniline segments.
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Fabrication and Electrochromic Performance of Silica/Tetraaniline/Carbon Nanotubes Composite Film
Xincai Liu,Yan Zhou,Danming Chao 한국고분자학회 2020 Macromolecular Research Vol.28 No.8
In this work, we report a new silica/tetraaniline/carbon nanotubes composite film prepared through an electrochemistry-assisted hydrolytic crosslinking reaction. The resultant samples were characterized through scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FT-IR), cyclic voltammetry (CV) and electrochemical impedance spectrum (EIS). Compared to the silica/tetraaniline binary film, this silica/tetraaniline/carbon nanotubes ternary composite film displays enhanced electrochromic performance with large optical contrast values (Δ=67% at 700 nm), high coloration efficiency (85.6 cm2/C), and fast switching speed (tc=1.5 s and tb=5.2 s). This improvement of the electrochromic performance could be attributed to its interpenetrating network architecture, resulting porous structure and good conductivity of the carbon nanotubes. Furthermore, the electrochromic electrode exhibits outstanding cycling stability, due to its robust crosslinking molecular structure and good adhesion to the conductive substrate.
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Min Xie,Jun Wang,Xu Wang,Mingying Yin,Ce Wang,Danming Chao,Xincai Liu 한국고분자학회 2016 Macromolecular Research Vol.24 No.11
In this work, electrospun poly(ether sulfone) (PES) nanofibrous membranes coated with hydrophilic polydopamine (PES-PDA) were successfully prepared. As a separator of lithium-ion batteries, the prepared PESPDA nanofibrous membrane shows ultrahigh porosity, due to the extra-large surface area of the nanofibers. Moreover, good thermostability of PES and polydopamine also results in the low shrinkage of the membrane under high temperature. As a result of the large number of amine groups and phenolic hydroxyl groups from the polydopamine, superior electrolyte wettability and high liquid electrolyte uptake capacity of the PES-PDA nanofibrous membrane have also been disclosed through comprehensive study, which would decrease the electrolyte absorption time and improve the performance of the battery. In the cell evaluation, an expected enhancement of cell performance with reduced polarization phenomenon and improved cycling stability is observed after coating with polydopamine, which certifies the validity of the polydopamine coating.
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NYanyan,Mingying Yin,Ying Yan,Ce Wang,Xincai Liu,Danming Chao 한국고분자학회 2017 Macromolecular Research Vol.25 No.12
Electrochromic materials have attracted much attention due to their potential in intelligent applications. We report here the preparation of a crosslinked electrochromic polyurea containing oligoanilines and silicon groups (PUOSi), which shows good thermostability and interesting spectral properties. The crosslinked network structure (c-PUOSi) could be accomplished easily by virtue of hydrolysis reaction. The reversible electrochemical activity and improved electrochromic behavior have been disclosed through multiple electrochemical techniques coupled with UV-Vis spectroscopy. The stability of c-PUOSi film in the electrochemical switching measurements has been effectively enhanced through the crosslinking reaction of triethoxysilane end groups, whilst the resulting densified electroactive film shows low response speed during the electrochemical process. Our demonstrated system presents a deep understanding of structure-function relationship, which is a vital implication for the fabrication and application of the electrochromic devices.
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