CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yuting Tian,Weining Liu,Jun Hu,Zhiwei Li,Xiaoying Xin,Guodong Fu
The persistent global high-temperature weather warns us that improving energy efficiency and reducing CO 2 emissions are urgent. Controlling the solar energy input in buildings using photochromic smart coating can effectively reduce the energy consumption required for cooling. However, it remains a challenge to achieve high transparency and fast photoresponse in organic–inorganic hybrid photochromic smart coating. Herein, we utilize space-limited domains to design a template polymer that facilitates the formation of amorphous WO 3 nanodots, thereby enhancing the polymer network structure through hydrogen bonding and dipole–dipole interactions, which endow the smart coating with excellent adhesion strength up to 13 MPa. Notably, the photochromic smart coating with amorphous WO 3 nanodots exhibits higher transparency (96.8 %) than conventional glass (91 %), and a wide visible light modulation range of 96.8 %-4.8 %. Based on this, the cooling efficacy of the smart photochromic coating was assessed within a model residence under actual environmental conditions. The inner temperature of the model house was reduced by up to 13 °C, which decreased indoor heat absorption by 25.8 %, significantly improving energy efficiency. This work provides an important and attractive strategy for achieving energy-efficient building materials and addressing global climate warming.
研究领域:
材料科学
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能源工程
·
环境科学
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产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2025
·
IF 6.3
Jinglei Xing,Lei Yang,Tianci Ma,Xingzhong Fang,Guofei Chen
Colorless polyimide (CPI) films have good application prospects in flexible optoelectronic devices due to their excellent heat resistance and transparency. In this study, a diamine monomer containing a terphenyl skeleton and CF 3 group substituted at ortho -position of amino group, 1,4-bis(3-(trifluoromethyl)-4-aminophenyl)benzene (6FTD), was successfully designed and synthesized, and a series of corresponding polyimides (PIs) were obtained by copolymerization of 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA), 6FTD and 2,2′-bis(trifluoromethyl)benzidine (TFDB). The introduction of rigid and linear terphenyl structure in 6FTD was beneficial to improve the heat resistance and mechanical properties of PI films. In addition, the CF 3 group derived from 6FTD effectively inhibited the rotation between the imide ring and the benzene, so that the 6FTD-containing PI film had a high glass transition temperature ( T g ). At the same time, the CF 3 groups caused a large free volume between molecular chains, which ensured the excellent optical transparency and solubility. In particular, PI-50 exhibited high T g of 399°C, transmittance of 82 % at 450 nm, tensile strength of 146 MPa and tensile modulus of 3.9 GPa. These results indicate that the design of rigid skeleton and side group provides an effective method for developing heat-resistant transparent PI.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2024
·
IF 2.7
Xuhui Wang,Guojie Zhang,Huanhuan Dong,Yong Zhang
Maltitol, a natural compound, offers a potentially eco-friendly alternative to conventional auxiliary thermal stabilizers. Its auxiliary stabilization effect was studied by discoloration tests, Congo red tests, thermogravimetric analysis, and UV–visible spectroscopy. Additionally, x-ray photoelectron spectroscopy and discoloration tests were used to study the stabilizing mechanisms of maltitol. Compared to dipentaerythritol, commonly used in the PVC industry, maltitol as an auxiliary stabilizer exhibits better improvement in thermal stability. This improvement is related to its melting point, ability to complex with zinc chloride, and content of hydroxyl groups. Furthermore, the addition of maltitol in PVC not only maintains good transparency of PVC basically unchanged but also improves the mechanical properties. Maltitol, as a natural, eco-friendly, and efficient auxiliary thermal stabilizer, exhibits a promising application prospect in PVC materials.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Lingjun Zeng,Jian Wang,Lijie Duan,Guanghui Gao
Hydrogel-based electronics have gained comprehensive research interest in the field of wearable sensory device engineering owing to their electrical and mechanical properties, biomimetic features and biocompatibility. However, unlike traditional electronics with well-established manufacturing technologies, hydrogel electronic still need to develop durable force sensing, high transparency, favorable biosafety and low-cost preparation process. Herein, an ionic hydrogel electronics was reported by introducing interpenetrative polymers into natural polysaccharide matrix network via a photocurable additive manufacturing method. The obtained ionogel displays excellent mechanical properties including high mechanical strength of 160 kPa at a tensile strain of 640 %, and durablility over 1000 compression cycles without plastic deformation, while maintaining biocompatibility and transparency (91.6 %, 1 mm). By virtue of its excellent sensing abilities as well as remarkable reproducibility, the assembled ionogel-based wearable sensor are capable to precisely monitor subtle motions in facial expression and large joint bending. Crucially, the incorporation of polymers into bio-based supporting matrix yield promising 3D printed materials with integrated strain sensors, providing significant flexibility for the design and preparation of the next-generation flexible devices.
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2009
·Vol. 287
·期 4
·495-500
·
IF 1.736
Wang Chen-Yi,Li Peng-Hui,Li Guang,Jiang Jian-Ming
A series of novel fluorinated poly(ether ketone amide)s (PEKAs) were prepared from an unsymmetrical aromatic diamine, (4′-(4″-amino-2″-trifluoromethylphenoxy)-3′,5′-dimethylphenyl)(4-aminophenyl)-methanone ( 1 ), with various aromatic dicarboxylic acids using the phosphorylation polycondensation technique. The PEKAs had inherent viscosities ranging from 0.43 to 0.65 dl/g. All the fluorinated PEKAs could be soluble in many polar organic solvents such as N -methyl-2-pyrrolidinone (NMP), N,N ′-dimethylacetamide (DMAc), N,N ′-dimethylformamide (DMF), dimethyl sulfoxide (DMSO), and tetrahydrofuran (THF). Flexible and tough polymer films could be prepared by casting from DMAc solvent. The PEKA films exhibited high optical transparency with a cutoff wavelength of 354–365 nm and good mechanical properties with tensile strengths of 78–98 MPa and elongations at break of 11.5–18.5%. They showed glass-transition temperatures in the range of 288−323 °C and the onset decomposition temperatures in the range of 450−461 °C in nitrogen atmosphere. Meanwhile, the PEKA films possessed low dielectric constants of 1.98–2.71 at 1 MHz and low moisture absorption (<2%). Due to their properties, the fluorinated PEKAs could be considered as photoelectric and microelectronic materials.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Shidong Zhao,Limin Wu,Shuxue Zhou
A liquid-like poly(dimethylsiloxane) (PDMS) brush as an environmentally friendly, low surface energy modifier has a significant effect on improving the antismudge properties of coatings. However, in order to obtain a sufficient length of freely mobile chain segments to meet the liquid repellency, expensive single-terminal functionalized PDMS has to be chosen in the preparation of antismudge coatings. In this work, double-terminal functionalized PDMS was employed to fabricate antismudge polyurethane (PU) coatings with the help of alkyltrichlorosilane (RSiCl3). That is, bihydroxypropyl PDMS (BHPDMS) was terminated with RSiCl3, further grafted onto acrylic polyol chains using its residual Si–Cl bonds, and subsequently cured with an isocyanate trimer. Effects of the molecular weight of BHPDMS (Mn = 1000, 2000, 4300, and 10,000 g/mol) and the type of RSiCl3 (R = methyl, dodecyl, octadecyl) on the surface wettability of antismudge PU coatings were investigated. Among them, octadecyltrichlorosilane (OTS) terminated BHPDMS4300 exhibited the lowest water contact angle hysteresis (10.1°), which was even lower than that of the control samples via direct addition of monohydroxypropyl PDMS or BHPDMS4300. The antismudge PU coating also presented high transparency (90.5%) and excellent liquid repellency against various low surface tension liquids. Even after friction with steel wool, the coating can still maintain excellent antismudge performance. The results also showed enhancement of OTS on the liquid repellency of antismudge PU coatings, indicating its synergistic effect with BHPDMS brush. It is envisioned that OTS-terminated BHPDMS additive provides an avenue to fabricate cost-effective transparent antismudge PU coatings.
研究领域:
材料科学
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化学工程
·
表面化学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
·
IF 9.7
Shihai Wei,Xuwei Wang,Zhiyong Qin,Wei Gao,Shuduan Deng,Zhigao Liu,Liuting Mo
Organohydrogels have garnered considerable attention in the field of flexible sensors, largely because of their flexibility, durability, and multifunctionality. However, conventional organohydrogels demonstrate inadequate conductivity, necessitate substantial preparation time and energy, are challenging to repair following damage, exhibit immutable transparency, and are inherently unstable in extreme environments, which significantly restricts their practical application. Herein, a conventional synergetic self-catalytic system based on catechol molecules and metal ions was innovated for the rapid fabrication of conductive polyacrylic acid (PAA) organohydrogels in H 2 O/ethylene glycol (EG)/LiCl solvent. The dual self-catalytic system comprises ferric ions (Fe 3+ ) and cellulose nanofibers (CNF) coated with tannic acid (TA@CNF), which form stable redox pairs to activate ammonium persulfate (APS), thereby initiating the polymerization of monomers rapidly and effectively. Compared with other gel prepared by catechol metal ion autocatalysis system, the organohydrogel prepared by us has unique advantages, including: (1) Modifying the pH value of the TA-coated CNF enables a change in the transparency of the organogel and enhances its mechanical properties. (2) The color of the organohydrogel can be modified by adjusting the equilibrium of the redox system by APS. (3) The organohydrogel has the ability to rapid repairing (50 s). Moreover, the organohydrogel exhibits considerable tensile strength, satisfactory self-adhesion (44.2 ± 4.3 kPa), excellent conductivity (1.79 ± 0.035 S/m) and extreme environmental applicability (−60 °C to 45 °C). The organohydrogel displays excellent conductivity, sensitive response to tensile deformation, changeable color, rapid repairing and excellent mechanical properties. Thus, it can be applied to human movement monitoring, information encryption and intelligent control.
研究领域:
材料科学
·
生物医学工程
·
化学工程
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产品关联
DOI
PubMed
高影响因子
Polymers
·
2022
·Vol. 14
·期 21
·4560
·
IF 4.967
Yanqin Shi,Yuchen Yao,Songyan Lu,Lukai Chen,Si Chen,Huiwen He,Meng Ma,Xu Wang
The effect of different plasticizers on thermal stability, transparency, and migration resistance of the PVC stabilized with zinc arginine [Zn(Arg)2] was investigated. The thermal stability, migration resistance, and transparency of PVC with tributyl citrate (TBC) were better than PVC with dioctyl phthalate (DOP) characterized by oven aging method, migration test, and near infrared-visible-ultraviolet spectrophotometer. At the same time, the longer the carbon chain in citric acid esters, the better the thermal stability and transparency of PVC sample. The hydroxyl group in citric acid esters is helpful to improve the thermal stability of PVC samples. However, the elongation at break and Tgvalue of PVC containing DOP were very close to those of PVC containing TBC. The calculation results of Hansen solubility parameters also illustrated that DOP had better compatibility with PVC than TBC. Therefore, the excellent transparency and thermal stability of TBC plasticized PVC were attributed to the good compatibility between TBC and Zn(Arg)2, which was verified by the solubility test. Lastly, the mixture of dioctyl terephthalate (DOTP) and TBC was used as plasticizers for Zn(Arg)2stabilized PVC. When the ratio of TBC and DOTP was 1:1, the transparency, thermal stability, and migration resistance of Zn(Arg)2stabilized PVC samples were better than those of PVC plasticized by DOP or TBC alone. The mechanism was that the compatibility between Zn(Arg)2and PVC was greatly improved by the synergetic effect of TBC and DOTP, resulting in the improvement of thermal stability, migration resistance, and transparency of PVC samples.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2017
·Vol. 33
·期 1
·150-154
·
IF 1.024
Jiang Yuhang,Li Yao,Wang Xuesong,Piao Linglan,Shi Zuosen,Cui Zhanchen
A new and effective organic-inorganic hybrid hydrophilic anti-fog coating was proposed and prepared. As is well-known, the presence of an inorganic component typically decreases the hydrophilicity and transparency of the coating. To solve this problem, we used polyethylene glycol with two different molecular weights to modify the si-lane coupling agent and mixed it with hydrophilic copolymer to form coating formulas. We coated these formulas on polycarbonate(PC) substrates to measure the anti-fogging properties via contact angle and anti-fogging tests, com-pared their transparency properties using UV-Vis spectra and evaluated the hardness using a pencil hardness tester. The results demonstrate that the molecular weight of PEG has a strong influence on the properties of the anti-fog coatings. After the corresponding optimization, we manufactured an excellent anti-fog coating. In addition to good adhesion and hardness, the coating also exhibited excellent mechanical properties, optical transparency and perfect anti-fogging performance.
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
EUROPEAN POLYMER JOURNAL
·
2019
·
IF 3.621
Qi Wu,Xiaoru Ma,Feng Zheng,Xuemin Lu,Qinghua Lu
Highly transparent polyimides (PIs) with excellent combined properties are in great demand for flexible optical devices. In this work, transparent PIs were synthesized by fluorinated aromatic dianhydride ( 6FDA ) and three aromatic diamines containing methyl side groups with different amount and position. These PIs possessed moderate to great optical transparency and excellent solubility. With four methyl groups at 2,2′,5,5′-position in diamine, 2255TMB–PI exhibited the best transmittance up to 82% at 400 nm. In all cases, PIs were determined to have low dielectric constants (2.84–2.99) and high glass transition temperature (above 390 °C, even up to 407 °C for 2255TMB–PI ). In addition, the toughness of these PI films was also proven by a tensile strength of 130 – 156 MPa. In spite of the electron donating character of methyl groups, their steric hindrance was found to have significant effect on the combination properties of PIs. Spatial structures and packing morphology are thought to be the main contribution. Therefore, this work provided an easy way to prepare highly transparent polyimides with excellent combined properties by controlling steric hindrance through methyl side groups.
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
EUROPEAN POLYMER JOURNAL
·
2021
·
IF 4.598
Ang Shen,Guohua Wang,Jinggang Wang,Xiaoqin Zhang,Xuan Fei,Lin Fan,Jin Zhu,Xiaoqing Liu
Poly(1,4-butylene- co -1,4-cyclohexanedimethylene 2,5-furandicarboxylate) (PBCFs) was synthesized from bio-based 2,5-furandicarboxylic acid (FDCA), 1,4-butanediol (BDO) and 1,4-cyclohexanedimethanol (CHDM). The GPC showed that the number average molecular weight ( M n ) of PBCFs were in the range of 38400–44200 g/mol and the average molecular weight ( M w ) varied from 83,000 to 94,800 g/mol with the polydispersity index of 2.22–2.33. The chemical structures, compositions and sequence distributions of PBCFs were confirmed by 1 H NMR and 13 C NMR. Their thermal properties and crystallization behavior were investigated by Differential Scanning Calorimeter (DSC). Results showed that the glass transition temperature ( T g ) and melting temperature ( T m ) of poly(butylene 2,5-furandicarboxylate) (PBF) were increased from 38 and 171.8 °C to 65.8 and 211.7 °C for PBCF-68, respectively. Furthermore, the strength and modulus were increased from 44 and 950 MPa for PBF to 69 and 1360 MPa for PBCF-68 with the mole percentage of CHDM units of 68% in diol units. PBCFs demonstrated much better thermo-mechanical properties when compared with those of PBF, which might be used as the bio-based engineering plastic or excellent packaging materials with high transparency and good gas barrier properties.
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
CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Jie Zhou,Zhiqiang Fang,Jinyi Cui,Xiao Zhang,Yong Qian,Weifeng Liu,Dongjie Yang,Xueqing Qiu
The simultaneous attainment of high strength and high toughness of transparent cellulose nanofibril (CNF) film can expedite its uses in advanced applications. In this work, a wood-inspired strategy is proposed to address the conflict between strength and toughness by using natural derived lignosulfonic acid (LA) as a reinforcing additive. Only 1 wt% LA addition can double the toughness (11.0±1.3 MJ/m 3 ) of pure CNF film. Consequently, the as-prepared CNF/LA-1 nanocomposite film not only exhibits superior mechanical properties (23.6±1.3 MJ/m 3 toughness, 249±6 MPa strength, and 15.4±1.4 % strain), but also maintains an excellent optical transparency of 91.2 % (550 nm). Furthermore, the mechanism for simultaneously enhancing strength and toughness is essentially attributed to the improved hydrogen bonding between CNF-OH and LA-SO 3 H and effective energy dissipation system. This work provides a green and effective approach to prepare strong yet tough and transparent biodegradable CNF film for high-end applications.
研究领域:
材料科学
·
生物质工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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