AIP Advances
·
2023
·Vol. 13
·期 10
·
IF 1.6
Li Yinhe,Guo Zhiqiang,Ma Shunfa,Tian Rumeng,Liu Xingjiang,Wei Liuhe
A new hydroxy-silane coupling agent was synthesized from 3-butene-1-alcohol and mercaptopropyl-3-methoxysilane based on a click reaction between double bonds and sulfhydryl groups and was successfully used in the synthesis of silane-modified polyether (STPE). The effect of molecular weight of polypropylene glycol (PPG) on the properties of silane-modified polyether was studied. It was found that with the increase in PPG molecular weight, the initial thermal decomposition temperature and hardness of STPE elastomers decreased, but the molecular structure hardly changed. In addition, with the increase in molecular weight, the elongation at break of the elastomer will gradually increase, but the tensile strength of the elastomer does not change much. When the molecular weight reaches 20 000 g/mol, the resin with a viscosity of 1.6 × 10 5 mPa s can be obtained, and the elongation at break of the cured elastomer reaches 383.4% and the tensile strength is 0.25 MPa. After the STPE resin was prepared into a silane modified sealant, the tensile strength reached 1.31 MPa and the elongation at break reached 406.2%, which had the best mechanical properties among the prepared sealants. This shows that the sealant prepared from high molecular weight resin has stronger mechanical properties, which provides a new idea for the preparation of sealants.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Shuhui Liu,Hang Zhang,Xingxiang Zhang,Wei Li
In this study, silane-terminated polyurethane microencapsulated phase change materials (SPU-MPCM) with reversible thermochromic properties were successfully synthesized by in-situ polymerization. The polyurethane prepolymer was prepared from dicyclohexylmethylmethane-4 (HMDI), butane-1,4-diol (BDO) and trimethylolpropane (TMP). Meanwhile, 3-mercaptopropyl trimethoxysilane (KH-590) was selected to modify silane-termination on the polyurethane prepolymer to obtain the shell material. The influence of isocyanate groups on the discoloration properties of the core composite can be avoided obviously by the silane-terminated shell material. SPU-MPCMs were prepared by in-situ polymerization using crystal violet lactone (CVL) as thermochromic colorant, bisphenol AF(BPAF) as color developer, n-butyl stearate (BS) as solvent and polyvinyl alcohol(PVA) as emulsifier. The effects of the amount of emulsifier and core/shell ratio on the surface morphology, particle size distribution and phase change properties of SPU-MPCMs were studied. The SPU-MPCMs prepared in this study have a relatively high latent heat of phase change (Δ H m = 122.2 J/g, Δ H c = 125.1 J/g) and can indicate the latent heat absorb-storage-release state through obvious color changes. At the same time, it also presents excellent thermal stability and cycle durability, high energy storage efficiency ( E = 76.8 %), and thus showing great application potential in wearable electronic devices, smart material coatings and temperature sensitive medical systems.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 45
·38897-38905
·
IF 3.289
Shaochen Zhou,Yingxuan Li,Fu Wang,Chuanyi Wang
Discrete electron energy levels emerge in ultra small metal clusters due to a strong quantum confinement effect, resulting in some intriguing, unique and superior features such as photoluminescence and catalytic activity. In the present work, silane-capped copper clusters were synthesized by a facile one-pot synthetic protocol for the first time. Electrospray ionization mass spectrometry data shows that the metal core of the cluster is mainly composed of 4–5 copper atoms, and the results of X-ray photoelectron spectroscopy and Fourier-transform infrared spectroscopy indicate that the surface of the as-synthesized copper clusters is capped by a silane stabilizer. These few-atom copper clusters exhibit a dual-peak fluorescence feature, giving emission bands centered at 410 nm and 580 nm, respectively. In addition, the copper clusters also show excellent performance in chemo-sensing of hydrogen peroxide, linearly responding in a concentration range of 5–250 μM. More interestingly, a photo-reversible color switching system based on the redox reaction of methylene blue was built up by employing these Cu clusters as a catalyst. Reduction of methylene blue by Cu clusters' chemo-catalysis at ambient conditions and oxidation of leucomethylene blue by those clusters' photocatalysis under UV light irradiation lead to a recyclable colorless-blue switching effect within ∼3 minutes. The present work proves that the versatile silane-capped Cu clusters possess both molecular and semiconductor like properties, holding great promise in optical and catalytic application fields.
研究领域:
材料科学
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光学
·
催化化学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Mingliang Pei,Lixia Huo,Xiaomei Zhao,Shuzhen Chen,Jiaxin Li,Zixin Peng,Kaifeng Zhang,Hui Zhou,Peng Liu
A facile strategy was developed to construct stable hydrophobic surface via the covalent self-assembly of silane-terminated fluorinated polymer as surface-attached polymer, which was synthesized by the free radical polymerization of 2-(perfluorohexyl)ethyl methacrylate (FOL) with γ-mercaptopropyltrimethoxysilane (MPS) as chain transfer agent. The synthesis condition for the silane-terminated fluorinated polymer (f-PFOL) and coating condition for the covalent hydrophobic coating on the Silicon (Si100) wafer were optimized with the static contact angle analysis, X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) measurements. The surface-free energies (γ s ) was stable at around 9.5 mJ/m 2 after washing off the non-functionalized poly(2-(perfluorohexyl)ethyl methacrylate) (PFOL), with the f-PFOL/PFOL mixture solution concentration higher than 0.045 g/mL. The proposed approach provides a universally applicable coating technique for the stable hydrophobic surface on various substrates.
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Coatings Technology and Research
·
2023
·
IF 2.3
Meng Fangfei,Wang Wenjin,Yu Yijia,Xia Wenjuan,Wang Ling,Wu Zhaoqiang,Chen Hong
A simple and convenient strategy for fabricating superhydrophilic multifunctional antifogging coatings was developed by hydrolyzing triethoxysilyl-terminated poly( N -vinylpyrrolidone) (TRES-PVP) with tetraethyl orthosilicate (TEOS) under acidic conditions. These antifogging coatings can be easily obtained by coating TRES-PVP hydrolysates on substrates at room temperature and then curing by thermal treatment. The superhydrophilic transparent coatings exhibited excellent antifogging, self-cleaning and antifouling properties. Additionally, the coatings also have good adhesion against the cross-cut test and remain stable after exposure to the laboratory environment for five months or immersion in water at room temperature for 20 days. Therefore, the present TRES-PVP hydrolysate coatings are promising for practical multifunctional antifogging applications.
研究领域:
材料科学
·
化学工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）