HIGH PERFORMANCE POLYMERS
·
2013
·
IF 0.85
Chaoyun Luo,Jiandong Zuo,Jianqing Zhao
An epoxy prepolymer with high refractive index, diglycidyl ether of thiodiphenol (DGETP), was synthesized by 4,4′-thiodiphenol and epichlorohydrin via a two-step method. The curing agent o-benzenedimethanethiol (OBDMT) was synthesized by thiourea method. Fourier transform infrared spectroscopy and proton nuclear magnetic resonance were employed to characterize the structures of these resins. The cured product of DGETP and OBDMT was analyzed by differential scanning calorimetry, ultraviolet–visible spectrometer, and Abbe refractometer and compared with the property of traditional curing agent of methyl hexahydrophthalic anhydride (MHHPA) and ordinary bisphenol A diglycidyl ether epoxy prepolymer cured products. The lower curing temperature and glass transition temperature of DGETP than those of MHHPA can be mainly attributed to the strong rotation capability of thioether bond. The zero light transmittance region of DGETP/OBDMT curing adhesive (200–380 nm) was broader than that of the other three. The refractive index of DGETP/OBDMT was up to 1.654.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
Polymer Chemistry
·
2019
·Vol. 10
·期 31
·4279-4286
·
IF 4.76
Qilong Li,Kar Lok Ng,Xiangqiang Pan,Jian Zhu
A high refractive index polymer was synthesized by the copolymerization of styrene with different functionalized N-phenyl maleimides, phenyloxide (P1), phenylsulfide (P2), and phenylselenide (P3). The effects of the substituent elements, molecular weight and selenium content on refractive indices, thermostability, and the glass transition temperature of the obtained polymers were investigated. The results showed that the refractive index of obtained polymers increased in the order of P3 > P2 > P1. Introducing the maleimide moiety into the polymer side chain improved its thermostablity and enhanced the glass transition temperature. To increase the selenium content, P4 was polymerized with selenium-containing maleimide monomer and 4-phenylselane styrene. An RI as high as 1.869 was obtained for P4 at a wavelength of 633 nm. Furthermore, the redox responsive selenide moiety endowed the selenide functionalized polymers with the property of refractive index transformation under oxidization and reduction conditions, which provided a material with potential application as a redox sensor.
研究领域:
聚合物科学
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材料科学
·
化学传感器
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产品关联
DOI
高影响因子
Coatings
·
2020
·Vol. 10
·期 7
·690
·
IF 2.436
Xiaolin Liu,Yansong Wang,Tao Bai
SiO2/ZrO2and SiO2/ZrO2/Al2O3composite organic–inorganic coatings were prepared by the sol-gel technology. The structure of the coating was characterized by IR, particle size analyzer, SEM, and AFM, respectively. The results showed that ZrO2, SiO2(inorganic component), and siloxane had undergone a hydrolytic condensation reaction, and the composite organic–inorganic coatings were formed with -O-M-O- (M is Si, Zr) as molecular skeleton network structure. Adding an appropriate ratio of ZrO2sol, no agglomeration and phase separation occurred, which could significantly improve the refractive index, hardness, and light transmittance of the coatings. Al2O3sol could greatly improve the friction resistance of the composite organic–inorganic coatings, and the Bayer ratio of the composite coatings could reach 7.86. By adjusting the proportioning of composite sol solution, the refractive index of the composite transparent coatings could be controlled from 1.52 to 1.65.Keywords:sol-gel technology;refractive index;ZrO2;Al2O3;coating
研究领域:
材料科学
·
化学工程
·
光学
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产品关联
DOI
高影响因子
MOLECULES
·
2018
·Vol. 23
·期 5
·1105
·
IF 3.098
Wei Yang,Xiangyang Lei,Haohao Hui,Qinghua Zhang,Xueran Deng
Moisture-resistant silicone coatings were prepared on the surface of potassium dihydrogen phosphate (KDP) crystal by means of spin-coating, in which hydrophobic-modified SiO2nanoparticles were embedded in a certain proportion. The refractive index of such coating can be tuned arbitrarily in the range of 1.21–1.44, which endows the KDP optical component with excellent transmission capability as well as the moisture proof effect. A dual-layer anti-reflective coating system was obtained by covering this silicone coating with a porous SiO2coating which is specially treated to enhance the moisture resistance. Transmittance of such a dual-layer coating system could reach 99.60% and 99.62% at 1064 nm and 532 nm, respectively, by precisely matching the refractive index of both layers. Furthermore, the long-term stability of this coating system has been verified at high humidity ambient of 80% RH for 27 weeks.Keywords:moisture-resistant;refractive index tunable;high-power laser system
研究领域:
光学材料
·
涂层技术
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DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2017
·
IF 2.323
Dan Li,Shanshan Li,Lingzong Meng,Tianlong Deng,Yafei Guo
The solubility data, composition of the solid solutions, and refractive indices of the LiCl–LiBr–H2O and CaCl2–CaBr2–H2O systems at 288.15 K were studied with the isothermal equilibrium dissolution method. The solubility diagrams and refractive index diagrams of the two systems were plotted at 288.15 K. There is no invariant point, one univariant solubility curve saturated with solid solution, and one crystallization field of the solid solution in the phase diagrams. The two systems belong to the solid solution type, and no double salts formed in the systems. The refractive indices calculated with an empirical equation agree well with the experimental data. By combining the composition equations and solubility equilibrium constant equations of the solid solutions, the solubilities of the two systems at 288.15 K were calculated on the basis of the Pitzer and Harvie–Weare models. The calculated solubilities agree well with the experimental results.
研究领域:
化学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2014
·
IF 2.083
Jiayi Chen,Lingxiao Chen,Yueqing Lu,Yingjie Xu
Densities ( ρ ) and viscosities ( η ) of 1-methylimidazolium acetate ([Mim]Ac) protic ionic liquid + water mixture were measured at T = (293.15, 298.15, 303.15, 308.15 and 313.15) K under atmospheric pressure. Refractive indices ( n D ) and electrical conductivities ( κ ) of the above-mentioned system over the entire composition range were measured at 298.15 K. Excess molar volumes ( V E ), viscosity deviations (Δ η ) and refractive index deviations (Δ n D ) were obtained from the experimental data and fitted to the Redlich–Kister equation with satisfactory results. The results show that V E values of the system are negative over the whole composition range, whereas Δ η and Δ n D values are positive. Other volumetric properties such as apparent molar volumes ( V ϕi ), partial molar volumes ( V ¯ m , i ) and excess partial molar volumes ( V ¯ m , i E ) of the system were calculated from the density data. The concentration dependence of κ was fitted according to the empirical Casteel–Amis equation. The measured and derived properties were employed to investigate the intermolecular interactions of the system.
研究领域:
物理化学
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Chao Chen,Luoning Zhang,Xian He,Zuowei Zhang,Foxin Zhou,Cheng Zou,Yanzi Gao,Meina Yu,Huai Yang
Currently, thin polymer-dispersed liquid crystal (PDLC) films used in display applications have rarely been studied because the contrast ratio (CR) considerably decreases with decreasing thickness. Herein, the refractive index of the polymer matrix ( n p ) is adjusted by introducing bromine atoms and benzene rings into the acrylate, and the on-state transmittance is enhanced by improving the matching degree between n p and the ordinary refractive index of the liquid crystal. Simultaneously, the dissimilarity between n p and the average refractive index of LC is also elevated, which increases off-state scattering. This ultimately results in a 123 % increase in CR. Appropriate n p also broadens the viewing angle. In addition, further introduction of the methyl group on the acrylate monomer significantly increases the polymer pore size, resulting in a voltage reduction of 52 %. This study provides a new approach for enhancing the CR of PDLC films, expanding their potential applications.
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 32
·47834
·
IF 2.188
Jianjun Chen,Zien Fu,Hengchao Huang,Zhonghua Chen,Xingrong Zeng
A facile route was introduced to prepare homogeneous silicone resin doped with titanium hybrid with high refractive index (RI). Specifically, the hybrids were obtained from the transesterification of hydroxyl-phenyl-vinyl silicone resin and titanium isopropoxide under anhydrous conditions. The structures of hybrid silicone and their corresponding intermediates (hydroxyl-phenyl-vinyl silicone) were characterized by nuclear magnetic resonance spectroscopy ( 1 H NMR, 29 Si NMR) as well as Fourier transform infrared spectroscopy (FTIR). The hybrids had a transmittance of more than 88% ranging from 450 nm to 800 nm, a high RI of 1.585, and a lower water vapor permeability of 3.58 g /m 2 .24h. Results from FTIR showed intensity of Ti-O-Si bond in hybrid decrease with extended the storage time, but the properties of cured hybrids including optical, mechanical, and gas permeability were not influenced. Compared to chips encapsulated with pure silicone, the luminous efficiency of the chips encapsulated with hybrids was improved from 138.6 lm/W to 156.4 lm/W. The thermal shock and hygrothermal aging test also demonstrated the hybrids had a wide range application in light-emitting diode (LED) packaging. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47834.
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
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 34
·11999-12005
·
IF 4.39
Huanhuan Cheng,Abudukadi Tudi,Peng Wang,Kewang Zhang,Zhihua Yang,Shilie Pan
A new ternary Ba-based selenide, Ba3SiSe5, was synthesized by a high-temperature solid-state method. It crystallizes in the centrosymmetric space group Pnma (no. 62) of the orthorhombic system. The structure of the title compound consists of unique Se(4)Ba layers and discrete SiSe4 tetrahedra. The structure and computational properties of Ba3SiSe5 are systematically studied together with those of the Ba–MIV–Q (MIV = Si, Ge; Q = S, Se) system, and show an interesting difference in dimensions formed by one of the crystallographic Ba atoms and MIVQ4 tetrahedra, as well as optical property transformations modulated by MIV atoms. First principles methods were employed to obtain a better understanding of the relationship between structures and properties. Ba3SiSe5 maintains a moderate birefringence of 0.044@1064 nm and the real space atom cutting method indicates that the SiSe4 tetrahedra make the major contribution to its birefringence.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
PubMed
高影响因子
HIGH PERFORMANCE POLYMERS
·
2025
·
IF 1.6
Zihao Wu,Jian Wang,Jiaxin Liu,Jinhua Lei,Heran Nie,Qiliang Yuan,Zhipeng Wang,Liang Li
Aromatic polyesters are an attractive class of engineering thermoplastics with excellent chemical properties, thermal stability and environmental stability, as well as good optical properties, but they have rarely been reported. Refractive index (RI) is one of the properties commonly used to compare the optical properties of materials. The higher the refractive index, the thinner the lens made of the corresponding material; however, the preparation of high-refractive-index polymers is currently a thorny issue, in which the structure of the polymer molecules has a great impact on their refractive index, to design high-refractive-index materials requires starting from the structure of the molecules. Phenolphthalein has a unique structure with a molecular skeleton consisting of three benzene rings and a cyclic lactone that exhibits a twisted non-coplanar structure. This cyclic side group can hinder the accumulation between the polymer molecular chains, not only improving the solubility of the polymer molecules, but also increasing the transparency of the polymer films. In this work, we used phenolphthalein (PHT) and its derivatives to polymerize with terephthaloyl chloride (TPC), respectively, through the structural differences between them, the influence of polymer structure on the refractive index and thermal properties was discussed. Among them, polyester PAR-NPHT had the highest refractive index (nd>1.67), and is expected to be a new generation of optical materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2014
·
IF 2.045
Lingzong Meng,Dan Li,Tianlong Deng,Yafei Guo,Cunyun Ma,Youcai Zhu
The solubilities and refractive indices of the NaBr–CaBr2–H2O system at 288.15 K were determined using the isothermal equilibrium solution method. The phase diagram and refractive index diagram were drawn for this system at 288.15 K. The system belongs to the hydrate II type. The phase diagram is comprised of two invariant solubility points, three univariant solubility curves, and three areas of crystallization: NaBr·2H2O, NaBr and CaBr2·6H2O. Using the temperature-dependent formulas from the literature, the Pitzer parameters and the solubility product constants (ln Ksp) of NaBr·2H2O and NaBr were determined. Applying the Pitzer and Harvie–Weare (HW) model, the solubility product constant of CaBr2·6H2O was fit with the solubilities in this research work, and then, the mean activity coefficients of sodium bromide and calcium bromide and the solubilities for the ternary system at 288.15 K were demonstrated. Comparisons between the calculated and measured solubilities show that the predicted data have good accordance with the experimental results.
研究领域:
物理化学
·
热力学
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产品关联
DOI
高影响因子
OPTICS LETTERS
·
2022
·Vol. 48
·期 1
·139-142
·
IF 3.56
Zhenyu Ma,Jing Sun,Sijie Zhou,WenJun Shan,Yunxiang Yan,Yunxiang Yan,Yongjun Liu
A novel, to the best of our knowledge, type of compact pH fiber sensor combined with a hydrogel based on the whispering gallery mode (WGM) is proposed and integrates a liquid crystal (LC) microdroplet in a capillary in a compact structure as small as 180 µm. In the research, the hydrogel performs both as a supporting frame and a responsive material that causes morphological deformation of the LC microdroplet with pH variation. Moreover, a new phenomenon of pH-induced LC refractive index variation is observed and applied in the pH measurement, so that the acid itself can also lead the LC microdroplet structure transition. Thus, the WGM method is applied to detect the composite effect simultaneously to improve the sensing capability. The sensitivity of the sensor in the pH range from 4.55 to 6.86 reaches 3.19 nm/pH. The response time is short, within 60 s. The simple and compact structure of the sensor reduces the cost and enhances the stability, which is of great potential for biomedical pH measurement.
研究领域:
生物医学工程
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）