POLYMER BULLETIN
·
2020
·Vol. 78
·期 4
·2067-2083
·
IF 2.014
Shan Changli,Ning Chuang,Lou Jingjie,Xu Wei,Zhang Yingqiang
A series of UV-curable waterborne fluorinated polyurethane (UV-WFPU) were prepared successfully based on novel fluorinated side chain extender (F-TMP). The structure of F-TMP and particle size of UV-WFPU dispersions, contact angle (CA) and surface free energy, morphology, and damping property of UV-WFPU films were characterized through Fourier transform infrared spectroscopy, nanoparticle size analysis, contact angle test, scanning electron microscope and dynamic mechanical analysis (DMA), respectively. The results indicated that UV-WFPU dispersions had a particle size between 49.01 and 61.52 nm. The latex particle size and tan δ value of UV-WFPU films increased with the increase in F-TMP contents. The studies of surface properties confirmed that UV-WFPU films based on F-TMP had outstanding hydrophobicity properties. The highest CA of water and lowest surface free energy of UV-WFPU films reached 96.2° and 21.17 mJ/m 2 , respectively. Meanwhile, the DMA results showed UV-WFPU films possessed great damping property which had the broad temperature range enhanced by F-TMP, with a maximum value at 190.4 °C. The results of mechanical properties showed that the addition of fluorine increased in the tensile strength of the film. And these films have potential application values in the technical fields of damping, anti-corrosion and dust prevention.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
ACS Applied Bio Materials
·
2022
·
IF 0
Yingchun Zhang,Dongjie Yang,Xueqing Qiu,Zhixian Li
Green and controllable preparation of silver nanoparticles (AgNPs) remains a great challenge. In this work, ethanol-extracted lignin-based nanosilver composites (AgNPs@EL) were synthesized at room temperature with the assistance of ultraviolet (UV) radiation. The ethanol-extracted lignin (EL) could serve as natural dispersion carriers and reducing agents for AgNPs. The reducing ability of EL could be further improved under UV irradiation, which enables the rapid synthesis of AgNPs at room temperature. More importantly, due to the good photothermal conversion capacity of EL, AgNPs@EL exhibits remarkably enhanced photothermal performance and excellent photothermal antibacterial ability, which could cause 7.2 and 5.3 log10 CFU/mL reduction against Escherichia coli and Staphylococcus aureus, respectively, under near-infrared (NIR) irradiation (808 nm, 1.8 W/cm2) for 5 min. Furthermore, the composite film obtained by impregnating bacterial cellulose onto AgNPs@EL solution also shows significantly improved mechanical properties and photothermal antimicrobial activity. Therefore, this work may provide insights into the design of lignin-based photothermal-mediated antimicrobial materials.
研究领域:
材料科学
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纳米技术
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生物技术
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化学工程
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环境科学
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INDUSTRIAL CROPS AND PRODUCTS
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2013
·
IF 2.468
Xiaohuan Liu,Jifu Wang,Shouhai Li,Xiaowei Zhuang,Yuzhi Xu,Chunpeng Wang,Fuxiang Chu
The aim of this study was to develop economically UV-absorbent and visible-transparent films. For this purpose, lignin was selected because of its strong ultraviolet (UV) absorbing property. Lignocellulosic butanol residue, as the by-product of lignocellulosic butanol production, is rich in biobutanol lignin (BBL). Herein, BBL was modified with acryloyl chloride and then copolymerized with n-butyl acrylate (BA) and methyl methacrylate (MMA) by free-radical polymerization. The chemical structure of poly(BA-co-MMA) chains was identifiable by 1 H NMR and 13 C NMR spectroscopies, combined with UV–visible spectra to confirm the existence of the aromatic groups that are attributed to BBL in the copolymer . This provided evidence that a BBL graft copolymer was successfully synthesized. The optical, photo-stability, chemical resistance, thermal and mechanical properties of the copolymer were evaluated. The copolymer film can absorb 96.2% of UV light, while allowing 70% or higher transmittance in the visible spectrum when the surface concentration of BBL-AC was 240 μg cm −2 . In addition, the copolymer film retained excellent absorption capacity in the UV region and high transparency in the visible light region after 75 min continuous UV-irradiation or when heated at 100 °C, rendering it potential to use as a UV-absorbent film. The copolymer exhibited good chemical resistance, thermal and mechanical properties compared with pure poly(BA-co-MMA). This strategy not only provides a novel approach for UV-absorbent films but also greatly extends the comprehensive utilization of BBL.
研究领域:
高分子科学
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材料科学
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可持续化学
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可再生资源
·
功能薄膜
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DOI
高影响因子
Materials Today Chemistry
·
2026
·
IF 7.4
Yifei Xu,Pengjun Zhang,Shuwei Hao,Chongqiang Zhu,Chunhui Yang
Novel double perovskite Cs 2 Na 0.7 Ag 0.3 InCl 6 : Mn 2+ material is developed. • Tunable dual emission covering full visible light range is fulfilled. • Novel perovskite material is excited by deep-ultraviolet light. • White LED with high CRI of 87.9 is fabricated by coating double perovskites and commercial BaMgAl 10 O 17 :Eu 2+ blue phosphor on deep-UV chip. The commercial potential of traditional double perovskites in white light-emitting diodes (WLEDs) has been constrained by low photoluminescence quantum yield (PLQY) and narrow emission spectrum, mainly due to parity-forbidden transitions and indirect bandgap characteristics. To address these issues, Ag + doped Cs 2 NaInCl 6 (CNIC) are synthesized via solvothermal method. Compared to the undoped sample exhibiting a low PLQY of 2.76%, Ag + doped samples show a high PLQY of 77.56%, attributing to STEs emission of 540 nm. Additionally, a series of Cs 2 Na 0.7 Ag 0.3 InCl 6 : x Mn 2+ novel materials are designed. The results demonstrate that an energy transfer pathway from STEs to Mn 2+ in co-doped system, enabling tunable dual emission across the entire visible spectrum. Notably, Cs 2 Na 0.7 Ag 0.3 InCl 6 : x Mn 2+ materials can be effectively excited by deep-ultraviolet (deep-UV) light. A WLEDs device is fabricated by coating this novel material and commercial BaMgAl 10 O 17 :Eu 2+ blue phosphor on deep-UV chip, producing warm white light with a CIE coordinate of (0.3609, 0.3576), a correlated color temperature (CCT) of 4460 K and a high color rendering index (CRI) of 87.9. These results show that Cs 2 Na 0.7 Ag 0.3 InCl 6 : x Mn 2+ novel materials have potential for application in solid-state lighting.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
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2023
·
IF 5.9
Kun Wang,Xinge Liu,Shumin Yang,Jianfeng Ma,Genlin Tian,Lili Shang,Zehui Jiang,Qianli Ma
Bamboo, as an important biomass raw material, has a very favorable prospect for Nature-based Solution. Here we provide a method to prepare bamboo-based lignocellulosic nanofibrils (LCNFs) and films with excellent impedance performances by p -toluenesulfonic acid ( p -TsOH) under mild condition. The combined delignification factor (CDF) and combined hydrolysis factor (CHF) were introduced to regulate the hydrolysis severity. The resultant LCNFs with uniform diameter retained a plentiful reactivity without surface functional group changing. The ascendant thermal stability ( T max > 360 °C) of the LCNFs were also obtained. The films made by the LCNFs can block about 99 % UV light with transparency greater than 50 % which exhibited remarkable UV resistance in both UVA and UVB regions. Furthermore, the films presented excellent hydrophobic stability which showed large contact angles (water, 89–99°) and maintained at 64° after 300 s. These properties make bamboo-based materials substitute bamboo for plastics and can be used in aviation, construction, automotive industry, packaging and many other fields, conforming to international initiatives.
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Guolin Zheng,Yifan Cui,Zhe Jiang,Man Zhou,Ping Wang,Yuanyuan Yu,Qiang Wang
Personal protective textiles have attracted extensive interest since Corona Virus Disease 2019 has broken out. Moreover, developing eco-friendly, multifunctional waterproof, and breathable surface is of great importance but still faces enormous challenges. Notably, good hydrophobicity and breathability are necessary for protective textiles, especially protective clothing and face masks for healthcare. Herein, the multifunctional composite coatings with good UV-resistant, anti-oxidative, hydrophobic, breathable, and photothermal performance has been rapidly created to meet protective requirements. First, the gallic acid and chitosan polymer was coated onto the cotton fabric surface. Subsequently, the modified silica sol was anchored on the coated cotton fabric surface. The successful fabrication of composite coatings was verified by RGB values obtained from the smartphone and K/S value. The present work is an advance for realizing textile hydrophobicity by utilizing fluorine-free materials, compared with the surface hydrophobicity fabricated with conventional fluorinated materials. The surface free energy has been reduced from 84.2 to27.6 mJ/m 2 so that the modified cotton fabric could repel the ethylene glycol, hydrochloric acid, and sodium hydroxide solutions, respectively. Besides, the composite coatings possesses lower adhesion to deionized water. After 70 cycles of the sandpaper abrasion, the fluorine-free hydrophobic coatings still exhibits good hydrophobicity with WCA of 124.6 ± 0.9°, with overcoming the intrinsic drawback of the poor abrasion resistance of hydrophobic surfaces. Briefly, the present work may provide a universal strategy for rapidly creating advanced protective coatings to meet personal healthcare, and a novel method for detecting RGB values of composite coatings by smartphone.
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DOI
PubMed
高影响因子
Processes
·
2023
·Vol. 11
·期 3
·903
·
IF 3.5
Yajie Wang,Xin Dong,Chengfeng Liu,Peng Cheng,Gilles Mailhot
The decolorization of azo dye Orange II using a UVA-Fe3+-PMS-oxalate system was studied. A series of experiments was performed to investigate the effects of several variables, including the pH, PMS dosage, Fe3+concentration, oxalate concentration, and coexisting anions. The results revealed that a lower pH facilitated the decolorization, and relatively high decolorization efficiency (97.5%) could be achieved within 5 min at pH 3.0. The electron paramagnetic resonance (ESR) and radical quenching experiments revealed that SO4•−played a crucial role in the decolorization of Orange II (85.8%),•OH was of secondary importance (9%), and1O2made a small contribution to the decolorization (5.2%). Furthermore, the formation of•OH in the experimental system strongly depended on HO2•/O2•−. These reactive oxidants were able to directly attack the azo bond of the luminescent group in Orange II and initiate the decolorization process. The efficient UVA-Fe3+-PMS-oxalate system showed great application potential in the treatment of wastewater contaminated by azo dyes.Keywords:PMS activation;Orange II;decolorization;UVA irradiation;Fe3+-oxalate complexes
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高影响因子
Materials
·
2023
·Vol. 16
·期 11
·4010
·
IF 3.4
Su Zhang,Baoyu Huang,Zenghao Jiang,Junfan Qian,Jiawei Cao,Qiuxia Feng,Jianwei Zhang,Xiaogan Li
Au modified TiO2/In2O3hollow nanospheres were synthesized by the hydrolysis method using the carbon nanospheres as a sacrificial template. Compared to pure In2O3, pure TiO2, and TiO2/In2O3based sensors, the Au/TiO2/In2O3nanosphere-based chemiresistive-type sensor exhibited excellent sensing performances to formaldehyde at room temperature under ultraviolet light (UV-LED) activation. The response of the Au/TiO2/In2O3nanocomposite-based sensor to 1 ppm formaldehyde was about 5.6, which is higher than that of In2O3(1.6), TiO2(2.1), and TiO2/In2O3(3.8). The response time and recovery time of the Au/TiO2/In2O3nanocomposite sensor were 18 s and 42 s, respectively. The detectable formaldehyde concentration could go down as low as 60 ppb. In situ diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS) was used to analyze the chemical reactions on the surface of the sensor activated by UV light. The improvement in the sensing properties of the Au/TiO2/In2O3nanocomposites could be attributed to the nanoheterojunctions and electronic/chemical sensitization of the Au nanoparticles.Keywords:Au modified TiO2/In2O3hollow nanospheres;room temperature formaldehyde sensors;UV activation;in situ DRIFTS
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PubMed
高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Fei Pan,Yuanhang Xiao,Long Zhang,Jiajing Zhou,Chunhua Wang,Wei Lin
Eco-friendly keratin-based retanning agents have aroused widespread interest in leather manufacturing, because they recycle the biomass wastes for sustainable industry. However, the poor filling effect and binding strength of hydrolyzed keratin from bovine hair wastes limit its application for leather retanning. Here we reported a series of polyacrylate-modified keratin (PMK) retanning agents synthesized from vinyl monomers and bovine hairs via a surfactant-free and UV-initiated polymerization. The obtained spherical PMK retanning agents exhibited ideal characteristics, such as appropriate molecular weight (13–22 kDa) and particle size (86–110 nm), and good colloidal stability in the tanning bath (pH 5.5). We further validated these agents for retanning bovine shoe upper leather. Compared with FB (i.e., a commercial retanning agent), leather retanned with PMK 75 showed increased thickness (∼50%) and reduced Δ b * (∼80%), suggesting excellent filling properties and yellowing resistance. Moreover, the retanning agent afforded the products improved physical properties (e.g., tensile strength ∼17.3 N/mm 2 , tear strength ∼72.7 N/mm and elongation at break ∼75.4%) and sensory properties (e.g., compression thickness ∼0.25 mm and resilience thickness ∼0.21 mm). This work not only offered a robust method for preparing low-cost retanning agents in sustainable industry, but also provided more opportunities for recycling biomass-based wastes aiming to closed-loop economy.
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高影响因子
Journal of Natural Fibers
·
2022
·
IF 3.507
Haihua Cai,Lizhi Gao,Li Chen,Xiang Chen,Zulan Liu,Zhi Li,Fangyin Dai
Although silk fabric has a good performance in softness, smoothness, permeability, and comfort, its poor UV resistance and easy yellowing seriously influence its appearance and further application. In this study, to improve its UV resistance, the amino group modified nano-SiO2 (SiO2-NH2) was grafted on to the surface of silk fabric through a condensation reaction, electrostatic interaction, and hydrogen bonding. The results indicated that the UV resistance property of modified silk fabrics was significantly improved and the UV protection factor (UPF) value could reach up to 60. After 20 times of washing, the UPF value could still maintain about 45. Moreover, the SiO2-NH2 modification did not influence the whiteness of silk fabric and the cell experiment proved that the modified silk fabrics had good compatibility. The method for silk modification in this study is effective, low-cost, and eco-friendly and it further can be applied in industry for large-scale production of UV-resistant silk fabric.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 5
·e53416
·
IF 3.057
Jian Kuang,Xiaowei An,Congshu Huang,Hongfei Chen,Chunyang Wei
This work developed a method to enhance the durability of anti-icing performance of a coating to endure abrasion and UV exposure, through grafting functional polydimethylsiloxane (PDMS) to TiO 2 particles and further reacting with polysilazane (PSZ) pre-polymer. This method remarkably improved the anti-icing properties of PSZ-based coatings evaluated by freezing delay time and ice removal shear strength. After either surface abrasion for 50 cycles or UV exposure for 100 h, the modified coatings exhibited ice shear strength increase by only 10.44 and 6.44 kPa respectively, significantly lower comparing to that of the coatings containing 30% TiO 2 with no PDMS modification (29.69 and 11.88 kPa, respectively). Such strengthened durability of anti-icing performance is attributed to the PDMS molecules bridging PSZ rigid segments and TiO 2 compositions, which formed a hydrophobic cross-linking network structure. The durable anti-icing technique developed herein shall appeal to many outdoor applications of facilities and infrastructures.
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高影响因子
JOURNAL OF POLYMER SCIENCE
·
2022
·Vol. 61
·期 7
·561-570
·
IF 3.046
Chuanwei Lu,Xinyu Wang,Wenhui Hua,Shan Wang,Shaojun Wang,Jifu Wang,Qiang Yong,Fuxiang Chu
Flexible epoxy thermosets have promising applications in modern industry. However, the development of next-generation flexible epoxy thermosets with high biomass content and multi-functions remains challenging. In this work, a sustainable cellulose/plant oil based flexible epoxy thermoset with excellent mechanical property, reprocessing performance, and UV absorption property was prepared. First, the amino cellulose is synthesized and used as a reinforcement and curing agent, and then the flexible epoxy thermoset is prepared by curing reaction of amino cellulose, citric acid, and flexible epoxy resin using zinc acetylacetonate as the transesterification catalyst. The epoxy thermosets show excellent thermal stability, the temperature at maximum weight loss reached 425°C. Mechanical property tests indicate that these thermosets have high mechanical strength (19.6 MPa) and satisfactory stretchability (36.1%–118%). The dynamic transesterification ester groups endow the epoxy thermoset with reprocessing ability. In addition, these epoxy thermosets show outstanding and stable UV absorption properties even after long-time UV-light irradiation or heating treatment, which makes these flexible epoxy thermosets have promising applications in UV-blocking coating. Graphical
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高影响因子
危险品化学品经营许可证（带存储）