EUROPEAN POLYMER JOURNAL
·
2022
·
IF 5.546
Gaojie Wu,Zichen Wang,Yucheng Zi,Shengli Qi,Guofeng Tian,Dezhen Wu
In order to prepare polyimide resins with excellent melt processing properties and high transmittance, a series of thermoplastic fluorinated polyimide resins was prepared by copolycondensation of the flexible dianhydride monomer 4,4′-(4,4′-isopropyldiphenoxy)bis(phthalic anhydride) (BPADA) and the fluorinated diamine monomer 2,2′-bis(trifluoromethyl)benzidine (TFMB) with different contents of fluorinated dianhydride 4,4′-(hexafluoroisopropyl)diphthalic anhydride (6FDA) or cyclobutanetetracarboxylic dianhydride (CBDA) via chemical imidization. The effects of the third monomer content on the melt processing properties, optical properties, heat resistance, and mechanical properties of the polyimide resins were systematically investigated. The minimum melt viscosity of the PI resins reached 630 Pa·s below 400 °C. The transmittance at 450 nm of PI sheets prepared by compression molding reached 77%, and the color was significantly lighter than the commercial thermoplastic resin ULTEM, indicative of excellent processability and optical properties. Besides, the PI resins displayed outstanding thermal performance with glass transition temperatures ranging from 224 °C to 242 °C, 5% weight loss temperatures higher than 520 °C in a nitrogen atmosphere, and coefficients of thermal expansion of 51.45–68.97 ppm/K. Moreover, the PI sheets possessed tensile strengths of 88.4–104.7 MPa.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 36
·e54322
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IF 3
Cunyue Wei,Kun Li,Feng Lin,Shengli Mi,Lina Dong,Yu Song,Ting Zhang
Hydrogels are characterized by high water content and are typically used in water environments. However, when used in air environments, hydrogels face limitations due to instability caused by water loss. This study reports the development of PAM/glycerol hydrogels with improved stability. By using water–glycerol bi-solvents to lock in water internally, a closed environment was established to reduce water exchange with the outside world. The hydrogel was made by forming a single PAM crosslinking network using UV crosslinked acrylamide (AM) monomer. The weight of the hydrogel varied by no more than 2% within 6 days, and the visible light transmittance was higher than 90%. In addition, the hydrogel had adjustable refractive index and mechanical properties. The hydrogels with stable performance could be used to fabricate optical lens with practical function in air environment. Meanwhile, the gels also have certain advantages in making a fluid-driven hydrogel actuator with stable performance.
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yaxin Liu,Beibei Ren,Jiani Yu,Xin Huang,Hong Jiang,Chuang Dong,Chunrong Xiong,Ting Wang,Na Wang,Lina Zhou,Hongxun Hao
In this work, a series of high-alumina glass and glass-ceramic species were successfully prepared and the effects of nucleating agent content on glass structure, nucleation mechanism and crystallization behavior were decoded by combining experiments and molecular dynamics simulations. The results show that ZrO 2 and TiO 2 remain in the residual glass to form a strong network connection structure when the nucleating agent content is low, which is conducive to the homogeneous nucleation of LiAlSi 2 O 6 and (MgAl 2 Si 3 O 10 ) 6 crystals. However, TiO 2 and ZrO 2 would exhibit nucleation ability and induce the formation of small scale ZrO 2 -rich clusters in glass with the increase of nucleating agent content, which is more conducive to the heterogeneous nucleation of ZnAl 2 O 4 and MgAl 2 O 4 crystals. Besides, molecular dynamics simulations were used for the first time to investigate the structure and phase separation behavior of complex multi-component oxide glasses at the microscopic level, confirming the key conclusion that structural similarities between the parent glass and the final crystal play a key role in the selection of nucleation mechanisms. Furthermore, the desirable crystal phase was controlled by nucleating agent content regulation. The obtained glass-ceramic containing 5.46 mol% nucleating agent exhibited excellent overall properties, with a microhardness of 9.03 GPa and a transmittance of 81.3 % in the visible light range.
研究领域:
材料科学
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物理学
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DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2024
·Vol. 7
·期 6
·1-9
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IF 23.2
Dai Xiaokang,Wang Longxiang,Fallatah Ahmed M.,Wang Xing,Almalki Abdulraheem S. A.,Qi Yiyu,Jin Xiaoyu,Yang Shengxiang,Yuan Bingnan
Translucent materials are widely used in indoor lighting, electronic display devices, photovoltaic devices, and other aspects of daily life. Developing materials with high transparency that can effectively manage the transmitted light spectrum is of significant practical importance. This study focuses on constructing a flexible composite film matrix using biomass nanocellulose fibrils (CNF) and polyvinyl alcohol (PVA) as raw materials. Based on the down-conversion luminescence principle, we use carbon nitride nanosheets (CNNs) as the core for light management, filtering UV rays from sunlight while converting them into visible light for light compensation. The transparency test results show that the prepared CNNs@CNF/PVA flexible composite film has a total transmittance of about 90% in the visible light range, with a haze greater than 60%. Three-dimensional fluorescence test results indicate that CNNs@CNF/PVA can convert UV light in the range of 250–375 nm into visible light in the range of 420–550 nm. Simulated outdoor lighting results show that the composite film material performs better than ordinary glass and PMMA in light transmission. This biomass-based flexible film material is expected to have broad applications in indoor lighting, flexible photovoltaic devices, and high-quality fruit and vegetable cultivation.
研究领域:
材料科学
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光管理技术
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生物质材料
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产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2020
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IF 2.779
Feng Tian,Cong Chen,Qiang Liu,Roman Yavetskiy,Maxim Ivanov,Stanislav Balabanov,Yagang Feng,Xin Liu,Ziyu Liu,Dianjun Hu,Zhaoxiang Yang,Tengfei Xie,Jiang Li
Nd:YAG transparent ceramics were obtained by vacuum sintering from nanopowders synthesized by co-precipitation method. The co-precipitated powder was optimized by studying calcination temperature (from 800 to 1300 °C) of the precursor and ball-milling time (from 0 to 24 h). Influences of calcination temperature and ball-milling time on comprehensive properties of nanopowders were studied in detail. Influences of sintering conditions (sintering temperature and holding time) on transmittance and microstructure were also investigated. The conclusions based on a comprehensive study of the whole ceramics processing from the powders synthesis to Nd:YAG ceramics sintering. The co-precipitated powder calcined at 1250 °C with ball-milling for 12 h demonstrates relatively better comprehensive properties. The 1.0 at% Nd:YAG ceramic sample with the thickness of 1.3 mm sintered at 1775 °C for 20 h has the highest in-line transmittance of 76.0% at 1064 nm.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2021
·
IF 4.598
Kaitai Hu,Qingqing Ye,Yingtao Fan,Junyi Nan,Fangyuan Chen,Yang Gao,Yingzhong Shen
Polyimide (PI) films have excellent comprehensive properties and bright prospects in the next generation of optoelectronic and microelectronic applications. PIs were synthesized by aromatic diamines and alicyclic dianhydrides considered to be the most effective method for preparing polyimides with high light transmittance and low dielectric constant. In order to improve the overall performance of polyimide, the introduction of a large trifluoromethyl group into the main chain is also considered a powerful strategy. In this article a novel diamine containing 6 trifluoromethyl groups has been designed and synthesized by Suzuki reaction. Afterwards, PIs were synthesized with fluorinated aromatic dianhydride and alicyclic dianhydride through a two-step method. The two PIs have excellent solubility: PI-a and PI-b exhibited excellent solubility in common polar solvents. Such as DMF, DMAc, NMP and DMSO at room temperature, and PI-a was soluble in low-boiling solvents such as ethyl acetate, CH 2 Cl 2 and CHCl 3 at room temperature. PI-b was soluble in low-boiling solvents acetone and CHCl 3 at room temperature, which was rarely seen in other aromatic polyimides. Soluble in common organic solvents, especially low boiling point solvents, made these polymers easy to process and suitable for processing technology in solution. This was an important modification for PIs. They also showed good high temperature resistance: the decomposition temperature (T 5% ) of two PIs were 520 °C and 475 °C. In addition, the residual rate at 790 °C was 50% and 49% respectively. Two PI films had a very low dielectric constant 2.26 and 2.24, respectively, which was attributed to the hyperbranched structure and strong electron-withdrawing fluorine-containing groups. PI-a and PI-b also had low water absorption of 0.66% and 0.72%, respectively. The transmittance of PI-a and PI-b high transparent films at 450 nm were 74% and 82%, respectively. The significant optical modification was mainly due to the weak electron-accepting alicyclic unit and the large trifluoromethyl electron withdrawing group. This work mainly provided an effective strategy for synthesizing comprehensive excellent performance PIs with high transmittance, excellent solubility, low water absorption, high heat resistance and low dielectric constant.
研究领域:
材料科学
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光学电子学
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产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2021
·
IF 4.158
Ting Shi,Qian Jia,Hongning Wang,Ruoyu Chen
The multifunctional coatings with hydrophobicity , oleophobicity, and antireflection have great practical application value. In this work, the mixed sol of alumina sol and silica sol prepared by the sol-gel method was deposited on both sides of glass substrates by dip-coating method. After the calcined coating was treated with hot water at 90 °C, the coating changed from smooth to grass-like hierarchical nanoflakelets, and the uneven distribution of silica nanospheres on grass further increased the porosity of the coating and formed a more complex double nano-scale structure. Finally, the coating was modified with PFDTES by the chemical vapor deposition method (CVD). The results showed that the highest transmittance of the coating reached 99.59% in the visible wavelength range of 400–800 nm, the contact angles of water, glycerin, ethylene glycol, and soybean oil were 175°, 150°, 140°, 120°, respectively, and the rolling angle of water is less than 3°. The coating has multiple functions of high transmittance, superhydrophobicity, and oleophobicity. In addition, the coating has significant resistance to chemical erosion, mechanical stress, and ultraviolet radiation , showing great potential for practical application.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Guangyou Liu,Jie Liu,Qitian Fan,Yunhe Liu,Zheng Zeng,Zhuohang Li,Xinzao Wu,Mingyang Yang,Bo-Ru Yang
Smart windows can dynamically control the optical transmittance of natural light and efficiently reduce the energy consumption of buildings. Currently, the practical application of smart windows is limited by high power consumption, low transmittance, and complicated preparation process. Developing smart windows with fast response and high transmittance is challenging. Herein, we fabricated a smart window based on electrophoretic display (EPD) technology, which can switch between white and transparent states by changing the stacking states of the electrophoretic particles on electrodes. To further increase the transmittance of the smart window, the polyvinyl alcohol (PVA) hydrophilic layer was spin-coated on the electrode to reduce the adhesion of particles. Compared with other EPD smart window technologies, our device exhibits the fastest response time of up to 375 ms at 30 V, high transmittance of up to 78% at 632 nm, and a high contrast ratio of up to 89. In addition, to reduce the particle’s lateral diffusion and improve our device's stability, the microcup array was aligned on the interdigital electrode. The particles can be driven and stacked onto the side walls of the microcup to achieve a transparent state. This work demonstrated that the EPD device would provide a promising future for practical smart windows with high transmittance and fast response time.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
POLYMER SCIENCE SERIES A
·
2023
·Vol. 65
·期 2
·147-156
·
IF 1
Chengcheng Lv,Yang Li,Mai Chongyang,Zhao Lielun,Guo Yawen,Zheng Zexi,Jiang Yan,Zhang Hongwen
Abstract In this study, vinyl-terminated polysiloxane (V-PDMS) had been prepared by ring-opening reaction, which was introduced as a monomer into polyacrylate emulsion via emulsion polymerization in order to obtain the acrylate- co -siloxane emulsion. The effect of V-PDMS content on the properties of the emulsion was investigated. Meanwhile, hydrochloric acid as catalyst and ethanol as dispersant, acidic silica sol had been prepared by the sol–gel method. Furthermore, the following three types of antireflection coatings were prepared. The first type of anti-reflection coating had been prepared by dipping a layer of copolymer emulsion on the substrate via the dip-coating method. Acidic silica sol and copolymer emulsion were sequentially dip-coated on the substrate in order to obtain the second type of anti-reflection coating, and the second type of anti-reflection coating was calcined to obtain the third type of anti-reflection coating. The effect of the interval time between two dips on the structure and light transmittance was investigated. The results show that the transmittance of the AR coating increases at the appropriate interval time. Among them, three types of antireflection coatings with different morphologies were prepared, each antireflection coating has a certain antireflection effect, and the highest transmittance can reach 94.5%.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2014
·
IF 2.822
Qijun Meng,Hailong Li,Shiyu Fu,Lucian A. Lucia
Cellulose nanofibrils have become increasingly prized as a raw material toward the preparation of composites due to their specific surface character and biocompatibility. TEMPO-mediated oxidation with post-mechanical treatment has been proposed as a promising method for the preparation of cellulose nanofibrils from cellulosic raw materials. In the current study it was found that the native hemicellulosic components in the raw material played a pivotal chemical role on the kinetics of generation of TEMPO-oxidized cellulose nanofibrils (TOCNs), as well as on thermal stability, and transmittance . The removal of xylans from the original feedstock facilitated not only an increase in both the carboxylate content and water retention value of the TEMPO-oxidized fibers, but also improved the transmittance of subsequently obtained TOCNs suspensions. It was also determined that the presence of xylans in the cellulosic feedstock hindered chemical accessibility through a barrier mechanism in which the TEMPO-mediated oxidation reaction rate was reduced.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
OPTICS LETTERS
·
2024
·Vol. 49
·期 9
·2245-2248
·
IF 3.1
Xiaolan Zhou,Xiaolan Zhou,Shengyuan Chen,Shengyuan Chen,Cong Zhang,Cong Zhang,Xu Huang,Xu Huang,Kailei Lu,Kailei Lu,Jianqi Qi,Jianqi Qi,Jianqi Qi,Tiecheng Lu,Tiecheng Lu,Tiecheng Lu,Tiecheng Lu
Narrowband green-emission, combined with superior physicochemical stability and thermal performance, is regarded as a common pursuit in backlight display applications. However, mainstream phosphor-converted materials composed of resin or silicone resin easily encounter the dilemma of thermal decomposition and chemical corrosion for practical use. To overcome this problem, in this work, Mn2+/Mg2+ co-doped AlON ceramic is successfully realized with ultra-narrowband green-emission and high transparency. The luminescent property of AlON: Mn2+–Mg2+ ceramic exhibits narrowband green emission centered at 509 nm with a full width at half maximum of 36 nm, which is smaller than the corresponding powder counterpart (44 nm). Moreover, AlON: Mn2+–Mg2+ ceramic presents a wide color gamut (103.6%) and high color purity (74%). Concurrently, high transmittance of this ceramic, at 82%, unveils a potential innovation in the display technology field. This work may facilitate the development of narrowband green light-emitting converters based on AlON: Mn2+–Mg2+ transparent ceramics in large color gamut backlight display applications.
研究领域:
材料科学
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光学工程
·
显示技术
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DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2016
·Vol. 99
·期 9
·3060-3066
·
IF 2.787
Chaoyu Li,Yubai Pan,Huamin Kou,Haohong Chen,Wei Wang,Tengfei Xie,Jiang Li
In this study, transparent ZnS ceramics were hot pressed from precipitated wurtzite nanopowders. Influences of sintering temperature on wurtzite-to-sphalerite phase transition and densification behavior have been investigated. Maximum sphalerite phase content and highest densification were simultaneously obtained in the sample hot pressed at 900°C with uniaxial pressure of 250 MPa for 2 h, which accounts for the highest transmittance above 55% and 70% in the range 2–5 μm and 5–13 μm, respectively. Preferred orientation of wurtzite grains in [002] direction paralleled to the press direction was also observed, which is supposed to be benefit to transmittance by reducing birefraction and second-phase scattering. Furthermore, second-phase scattering caused by wurtzite grains has been investigated. It is found that fine grains are conducive to hot-pressed ZnS ceramics with high transmittance, especially in the short-wavelength range.
研究领域:
材料科学
·
无机非金属材料
·
陶瓷学
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光学材料
·
纳米材料
·
固态物理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）