INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
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2014
·Vol. 15
·期 4
·6161-6168
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IF 2.339
Runqiang Liu,Yijun Zhang,Lianyang Bai,Mingxian Huang,Jun Chen,Yuping Zhang
A chiral selector of cellulose-2,3-bis(3,5-dimethylphenylcarbamate) (CBDMPC) was synthesized by reacting 3,5-dimethylphenyl isocyanate with microcrystalline cellulose dissolved in an ionic liquid of 1-allyl-3-methyl-imidazolium chloride (AMIMCl). The obtained chiral selector was effectively characterized by infrared spectroscopy, elemental analysis and1H NMR. The selector was reacted with 3-aminopropylsilanized silica gel and the CBDMPC bonded chiral stationary phase (CSP) was obtained. Chromatographic evaluation of the prepared CSPs was conducted by high performance liquid chromatographic (HPLC) and baseline separation of three typical fungicides including hexaconazole, metalaxyl and myclobutanil was achieved using n-hexane/isopropanol as the mobile phase with a flow rate 1.0 mL/min. Experimental results also showed that AMIMCl could be recycled easily and reused in the preparation of CSPs as an effective reaction media.Keywords:1-allyl-3-methyl-imidazolium chloride;synthesis;Cellulose-2,3-bis(3,5-dimethylphenylcarbamate);high performance liquid chromatography;chiral stationary phase;enantioseparation
研究领域:
化学
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分析化学
·
色谱学
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产品关联
DOI
PubMed
高影响因子
COLLOID AND POLYMER SCIENCE
·
2021
·Vol. 299
·期 9
·1489-1498
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IF 1.931
Yu Caili,Yan Chengfei,Shao Jintao,Zhang Faai
Green renewable resource has become a global hot spot. In this study, naturally occurring resource rosin derivative (RAG) was used to prepared a cationic waterborne polyurethane (WPU) dispersion using n-methyl di-ethanolamine (MDEA) as an ion center and 1,3-bis(3-aminopropyl) tetramethydisiloxane (APTMDS) as a chain extender, and hexamethylene diisocyanate (HDI) as a hard segment. The effects of MDEA and APTMDS contents on the particle size and storage stability of the WPU dispersion was determined, in addition, thermo-mechanical and mechanical properties, and antibacterial property as well as water uptake of the resulting polyurethane films were thoroughly investigated. The results show that an increase in the APTMDS content considerably improved the mechanical properties, surface hydrophobicity and water resistance of the WPU films. Moreover, all WPU films exhibit enhanced antibacterial activity against Escherichia coli and Staphylococcus aureus with the increase in the MDEA and APTMDS contents. Graphical abstract
研究领域:
材料科学
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高分子化学
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可持续材料
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DOI
高影响因子
POLYMER
·
2023
·
IF 4.6
Chunhui Qu,Liang Shan,Guoping Zhang,Rong Sun
Electronic crosstalk, signal propagation delay and loss on the redistribution layers (RDLs) have been increasingly serious along with the rapid development of wafer-level packing (WLP). Polyimide films with low dielectric permittivity (D k ) and low dielectric loss (D f ) at high frequency are in demand imminently as interlayer materials. In this work, a novel kind of intrinsic silane-containing polyimide was designed and prepared by the reactions of 1,3-Bis(3-aminopropyl)tetramethyldisiloxane (APDS) and 4,4′-Oxydianiline (ODA) with 2,2-Bis(3,4-anhydrodicarboxyphenyl) hexafluoropropane (6FDA). The chemical structure of polyimide was studied by FT-IR spectrum and NMR and their dielectric properties and other performances were systematically analyzed. Results showed that the lowest D k and D f of polyimide (6FDA/APDS) was 2.66 and 6 × 10 −4 at 10 GHz. Furthermore, the dielectric permittivity and loss of silane-containing polyimide decreased with increasing the content of silane . The excellent dielectric properties were attributed to decreasing polarization and increasing the free volume of molecular chains when the silane was introduced into the molecular structure of polyimide. This work provided guidance for the intrinsic silane-containing polyimide with low dielectric properties.
研究领域:
材料科学
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电气工程
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高分子化学
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DOI
高影响因子
MATERIALS SCIENCE-POLAND
·
2021
·Vol. 39
·期 3
·371-382
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IF 1.022
Cheng Chen,Bi-Wu Huang,Zheng-Ting Lu,Yang Wu
Precursor 3-ethyl-3-hydroxymethyloxetane was synthesized with trihydroxypropane and diethyl carbonate as the main raw materials. Intermediate 3-ethyl-3-allylmethoxyoxetane was synthesized with 3-ethyl-3-hydroxymethyloxetane and allyl bromide. Prepolymer 1,3-bis[(3-ethyl-3-methoxyoxetane)propyl]tetramethyldisiloxane was synthesized with 3-ethyl-3-allylmethoxyoxetane and 1,1,3,3-tetramethyldisiloxane. Cationic photoinitiator triarylsulfonium hexafluoroantimonate of 3 wt% was added to the prepolymer, and a novel kind of photosensitive resin was prepared. Structures of the compounds obtained at individual stages of the synthesis were analyzed and characterized by FTIR and 1H-NMR. Photo-DSC analysis showed that the prepolymer had excellent photosensitivity. Thermogravimetric analysis (TG) revealed that the ultraviolet (UV)-cured samples owned excellent thermal stabilities of up to 405°C. And the mechanical properties of the UV-cured samples were tested by the universal material testing machine, giving 25.95 MPa of tensile strength, 2,935.15 MPa of elastic modulus, and 4.09% of elongation at break.
研究领域:
高分子科学
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材料科学
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化学工程
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2016
·Vol. 40
·期 6
·5231-5237
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IF 3.277
Zhangping Xu,Wenjing Wang,Jingchuan Wu,Sai Mi,Jianming Zheng,Chunye Xu
A pair of solution-processable electrochromic polymers poly(2,3-bis(3,4-bis(dodecyloxy)phenyl)-5,8-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)quinoxaline) (P1) and poly(3,4-di(2-ethylhexyloxy)thiophene-co-3,4-dibutoxythiophene) (P2) were designed and synthesised through a chemical oxidative polymerization and copolymerization approach. According to colour mixing theory, the two polymers with complementary colours (green for P1 and purple-red for P2) were utilised to create black-to-transmissive switching films via co-processing from a solution containing them in an appropriate mass ratio. The films exhibit a deep black colour, moderate optical contrast and robust stability. This method and the films with favourable electrochromic performances could be employed for the realization of potential large area electrochromic device applications.
研究领域:
材料科学
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高分子化学
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电化学
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光电
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）