MACROMOLECULAR RESEARCH
·
2017
·Vol. 25
·期 12
·1153-1157
·
IF 1.405
Li Yanyan,Yin Mingying,Yan Ying,Wang Ce,Liu Xincai,Chao Danming
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.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 28
·13425-13432
·
IF 4.682
Zhao Yuxiang,Yan Yaqian,Wu Zhuangzhuang,Li Chaokun,Fan Ruimei,Feng Lijuan,Wang Wenxin,Chen Qi
A novel fluorescent covalent organic framework containing trimethyl silicon group (COF-TMS) was designed and prepared via the Povarov reaction to be used to detect fluorine ions, on account of the interaction between the silicon and the fluorine ions. Trimethyl silicon, as an electron-donating functional group, was replaced with hydrogen atom and the electronic state of the whole material changed. In this process, the change of COF-TMS structure resulted in the fluorescence color changing from red to blue obviously. Furthermore, the structure and optical property of COF-TMS did not change when there are anions such as H 2 PO 4 − , ClO 4 − , SO 4 2− , CO 3 2− , Cl − , Br − , I − , and NO 3 − in the solution. Notably, the crystallinity also became particularly high in this process, with perfectly regular hexagonal pore structures being clearly observed in the micron range. This work provides a new idea for the future study of COFs in the field of fluorescence through the combination of COFs structure and fluorescence color transformation.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2025
·
IF 6.3
Yize Wang,Lijie Qu,Lijun Qian,Wang Xi,Jingyu Wang,Yong Qiu
In this study, an organosilicone-based clustered phosphinic acid (MVCP) was successfully synthesized by an addition reaction with 2,4,6,8-tetra-methyl-2,4,6,8-tetra-vinyl- cyclo -tetrasiloxane (MVC) and hypophosphorous acid (HPA). MVCP was applied to biscitraconimide-reinforced epoxy resin (BCIEP) systems separately or along with TAD, a 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) derivative flame retardant. MVCP/TAD modified BCIEP were investigated systematically concerning on the flame retardancy and mechanism. When the flame retardants containing reached 3 wt%, the limiting oxygen index (LOI) of 3(MVCP/TAD)/BCIEP was increased to 31.2%, while UL 94 reached V-0 level. The peak heat release rate (pk-HRR) of 3(MVCP/TAD)/BCIEP was reduced by 37.3% and the charring residual rate was increased by 7.3% in the cone calorimetry test results, compared to those of BCIEP. Upon combustion, the clustered MVCP formed an aerogel-like residual carbon structure on the surface of the blends through the characteristics of its own silica aggregation, indicating that MVCP was an excellent condensed phase flame retardant. Meanwhile, MVCP reduced the damage of TAD to the mechanical properties of the matrix, showing a broad application prospect.
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
Journal of Inorganic and Organometallic Polymers and Materials
·
2022
·Vol. 32
·期 5
·1902-1912
·
IF 3.518
Song Dongdong,He Chuang,Zhang Gang,Wang Yanlin,Liang Zuoqin,Jiang Zicheng,Ma Su
Currently, the issue of natural flammability of unsaturated polyester resin (UPR) severely restrains its application. In this study, polymeric flame retardant poly methyl vinyl di (1-thio-2,6,7-trioxal-1-phosphabicyclo [2.2] octane-4-methoxy) silane (PMVDOS) with P–S–Si-based cage unit was synthesized. The UPR/PMVDOS composites were prepared by adding different ratios of PMVDOS into UPR. The flame-retardant properties and the char layer structure of UPR samples were evaluated via the limiting oxygen index (LOI), vertical burning test, cone calorimeter test, scanning electron microscopy, laser Raman spectroscopy, and X-ray photoelectron spectroscopy. The results showed that UPR/PMVDOS composites reached the UL-94 V-0 rating with the LOI value of 27.8%, and the carbon residue increased from 4.9% for pure UPR to 14.9% when the content of PMVDOS was 18 wt%. The peaks of heat release rate, total heat release, and total smoke production were comparatively reduced. The flame-retardant mechanism of PMVDOS mainly acted on the condensed phase. The surface of the matrix was covered with the polymer containing phosphorous and silicon dioxide particles, preventing the escape of flammable volatiles and isolating the exchange of oxygen and heat, thus, the degradation of the matrix could be inhibited. This research provides a solution to improve the flame retardancy of UPR.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Science China-Chemistry
·
2013
·Vol. 56
·期 8
·1152-1163
·
IF 1.327
Xiao MinYu,Han HuanMei,Xiao ShouJun
Porous silicon (PSi) prepared from Pt metal-assisted chemical etching (MaCE) was demonstrated to possess higher hydrosilylation efficiency (∼57%) than anodized PSi (∼11%) by surface reaction with ω-undecenyl alcohol (UO). Deconvolution of the SiH x ( x = 1-3) stretching bands revealed the abundance of SiH2 species on MaCE PSi was 53%, ∼10% higher than on anodized samples, while both of SiH1 and SiH 3 were ∼5% lower correspondently on MaCE PSi than on anodized samples. The surface SiH x abundances were suggested to account for the higher hydrosilylation efficiency on MaCE PSi. Optimization of Pt-assisted chemical etching parameters suggested a 7–15 nm thick Pt-coating and an etching time of 3–10 min for biochip applications. Scanning electron microscopy images revealed that an isotropic top meso-porous layer was beneficial for hydrosilylation and long-term durability under ambient conditions. To end, an example of histidine-tagged protein immobilization and microarray was illustrated. Combining the materials’ property, surface chemistry, and micro-fabrication technology together, we envision that silicon based biochip applications have a prosperous future.
研究领域:
材料科学
·
生物技术
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Junze Zhang,Tiandi Chen,Meng Zhu,Jian Lu,Xinlong Liu,Weiwei Sun,Mei Yi So,Bingang Xu
Fiber-based photochromic wearables have attracted growing attention in sustainable photo-patterning information displays, information security encryption, and optical data recording/storage. Molybdenum trioxide (MoO 3 ) is one of the key photochromic materials that possesses good photochromic performance, nevertheless, it faces considerable challenges in preparing photochromic textiles with stable, scalable, and long color-retention properties. In this work, a new kind of fiber-based photochromic wearables is designed and developed by combining cotton fabric with a MoO 3 -based self-adhesive polymer network and long chain silyl group. The prepared photochromic wearable has exhibited excellent fatigue resistance and favorable reversibility (> 40 cycles), rapid light response (reach color saturation with a UV dose of 60 kJ m −2 ), outstanding color retention capability (> 90 days), and desirable biocompatibility (cell viability > 100%). In addition, the prepared photochromic textiles could maintain a fast light response and excellent color retention even after experiencing repeated washing (20 cycles). Moreover, the photo-patterning photochromic wearables are verified by resisting the deterioration of acid solution, alkali solution, and sweat (pH 2.0–9.0) as well as keeping clear patterns under sunlight irradiation. As a demonstration of the application, fiber-based photochromic wearables are made and employed for the sustainable applications of rewritable photo-patterning and information security encryption.
研究领域:
材料科学
·
纺织工程
·
光电技术
·
信息安全
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）