Polymer Chemistry
·
2016
·Vol. 7
·期 37
·5828-5834
·
IF 5.687
Liman Hou,Lei Wang,Ning Zhang,Zhigang Xie,Dewen Dong
Metal–organic frameworks (MOFs) are extremely promising candidates for application in diverse fields. However, a limitation to the widespread use of MOFs is the absence of a facile and efficient chemical modification method which can greatly improve their poor processability and stability without altering the inherent outstanding chemical and physical properties. Herein, we report a universal post-synthetic modification strategy by directly forming polymer brushes on MOF surfaces without any premodification or immobilization of initiators via UV-induced photopolymerization. The method is applicable to a series of representative MOFs, allowing the formation of polymer brushes on the exterior surface of nanoMOFs and MOF membranes. Characterization of the polymer brushes indicates a high grafting density of grafted polymer chains, thus endowing MOFs with improved thermal/chemical stabilities with the inner chemical structure and porosity intact. Moreover, the polymer modification facilitates an efficient removal of organic dyes from water solutions.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
POLYMER
·
2019
·
IF 3.771
Ying Wang,Qiang Liu,Jinhui Li,Lei Ling,Guoping Zhang,Rong Sun,Ching-Ping Wong
Light-activated self-healing (LSH) materials have received extensive attentions recently due to their environmentally friendly repairing methods and excellent healing performance. However, the current reported LSH materials have poor mechanical strength and elasticity, which limit their applications. Herein, a novel series of coumarin-based polyurethanes with enhanced mechanical properties and elasticity have been synthesized which possessed a dramatic breaking stress of 27 MPa with a high breaking strain of 890%. Besides, the energy dissipation efficiency in continuous stretch cycles of the as-prepared polyurethanes varied negligibly, which proves the as-prepared LSHs have excellent elasticity. Meanwhile, after cutoff, the polymers exhibited excellent self-healing performance by UV irradiation for 40 min and the best healing efficiency of strain, stress and Young's modulus were 84%, 92%, 94%, respectively. The prepared self-healing polyurethanes showed great potential applications in the fields of smart materials such as self-healing coatings, electrochemical sensors and devices, electronic skin, etc.
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
POLYMER
·
2026
·
IF 5.1
Mei Wu,Junjie Tan,Jiating Feng,Dong Chen,Hongxiang Chen,Hongye Yan,Yu Zhou
To obtain a kind of UV-curable waterborne polyurethane adhesive with adjustable crosslinking degree and then regulate its properties, after polyurethane with carboxyl side groups was synthesized by a common method, glycidyl methacrylate (GMA) was grafted onto its side chain by the ring-opening reaction between carboxyl group and epoxy group, and then a kind of waterborne polyurethane with different acrylate group contents (WPUC) was conveniently prepared. The resulting WPUC can be cured to form the film with a three-dimensional crosslinked network structure (WPUC–C) under UV-light irradiation. The test results of gel fraction, volume swelling degree and crosslinking density show that the crosslinking degree of WPUC-C can be easily controlled by adjusting the GMA grafting content in WPUC. Furthermore, the relationships between the structure and properties of WPUC-C were researched. When the crosslinking degree of WPUC-C increases, its mechanical strength, adhesive property and thermal stability first increase and then decrease, the water resistance increases continuously and the light transmittance declines slightly. Among them, when the acrylate group content in WPUC is 0.4207 mmol g −1 , the resultant UV-cured WPUC-C has a tensile strength of 8.96 MPa and a shear strength of 1.67 MPa, good thermal stability and light transmittance (>95%), which exhibits the most optimal overall performance. Therefore, UV-curable waterborne polyurethane adhesive with excellent properties can easily be obtained by grafting GMA onto the side chain of waterborne polyurethane, which will have great application potential in the field of adhesive, particularly for bonding of heat-sensitive substrates and those requiring high transparency.
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Advanced Electronic Materials
·
2023
·Vol. 10
·期 2
·2300462
·
IF 6.2
Peilong Song,Yong Zhang,Jinshou Wang,Hui Liu,Li Tian
A new ultraviolet photodetector (UV PD) is successfully fabricated based on 2D NbWO 6 (NWO) nanosheets for the first time, which is synthesized by a facile solid-state reaction, ion exchange and liquid exfoliation process. The NWO nanosheet-based PDs exhibit excellent UV detecting performance at 1 V at 290 nm, high responsivity (378 A W −1 ), high external quantum efficiency ( EQE , 1.6 × 10 4 %), high spectral selectivity ( R 290 / R 400 = 8.84 × 10 3 ) and fast speed (1.05/88 ms). Furthermore, the NbWO 6 nanosheets film based PD shows great potential for the application in UV image sensing. This work provides a feasible strategy for the development of new UV PDs based on other potential layered niobates.
研究领域:
材料科学
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纳米技术
·
光电子学
·
光电探测器
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DOI
高影响因子
DYES AND PIGMENTS
·
2023
·
IF 4.5
Jingyu Deng,Ranran Kong,Zhiping Liu,Yuchen Weng,Li-Juan Fan
Epoxy acrylate (EA) is the most widely used prepolymer for an ultraviolet (UV)-curable adhesive. Its colorless and transparent appearance can meet some special application needs, but also bring some problems, such as the position and amount of adhesive cannot be well observed by the naked eye, and so that malposition, shortage, or leakage of adhesive may happen. The UV-curable EA adhesive with UV light-excited fluorescence can be used to locate the adhesive through simple visual observation, but would not interfere with the macroscopic appearance of the glued item under natural light. Here we introduced tetraphenylethylene (TPE), a typic structure having aggregation-induced emission (AIE) effect, into the adhesive system. TPE-modified methacrylate (TPE-MA) monomer was added to UV-curable EA adhesive to participate in the curing process. The concentration of TPE-MA added to the adhesive was optimized to 0.1 % of the amount of EA prepolymer in mol to give blue fluorescence under UV light . By comparing the cured products, we found that the one having TPE-MA to form covalent bonds with other components, has higher fluorescence intensity and better stability than the other one having TPE via simple blending. Finally, tensile lap-shear strength measurement and thermal analysis of the cured products revealed that the addition of a small amount of TPE-MA to the adhesive has no significant effect on the performance of the adhesive. In conclusion, due to the viscosity of the adhesive itself, the intramolecular movement of TPE is restricted even at dilute concentrations, resulting in blue fluorescence. We hope this study can open a new avenue for the preparation of fluorescent adhesives.
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高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Mingsheng Ren,Ziqiang Liu,Yating Ji,Yao Xie,Zaisheng Cai,Bi Xu
Preventing surface fogging is critical for maintaining transparency in various transparent applications such as windows, mirrors and goggles. However, the fabrication of durable antifogging surfaces has been significantly challenging. The challenges include the lack of a simple preparation method, low coating hardness, poor water resistance and inability to self-healing. In this work, we developed an organic-inorganic interpenetrating hydrophilic antifogging coating using vinyl hybridized silica nanoparticles (VSNPs), polyvinyl alcohol (PVA), and methacrylic acid (MAA). A durable antifogging coating with self-healing capabilities has been prepared using a facile UV curing process. Such a hybrid coating can maintain its outstanding antifogging performance even after 4000 cycles of sand abrasion and 36 h of water immersion. Due to these outstanding properties and facile preparation, VSNPs-PVA/PMAA coating shows great potential in practical applications.
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高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Bing Chen,Geng Lai,Zhangyou Liu,Wenhui Luo,Shufeng Lin,Huagui Zhang,Mingfeng Chen
The development of multifunctional epoxy resins that can be degradable and reprocessed is of great significance for the conservation of non-renewable resources and environmental protection. Herein, curing agents based on nitrogen–silicone Schiff base (BOB) and silica-bridged epoxy resin (ETOD) were designed and successfully synthesized. Then, ETOD was cured using BOB to fabricate a multi-silicon-bridge epoxy vitrimer containing dynamic imine bonds (BOB/ETOD). Notably, because of the presence of a large number of siloxane chain segments, BOB/ETOD exhibited excellent flame retardancy (the peak heat release rate (pHRR) was 57.7% lower than that of conventional epoxy resin (DDM/EP) and a carbon residual rate (RC700) of 27.7%, which is 1.6 times higher than that of DDM/EP). Furthermore, the networks of BOB/ETOD could topologically rearrange due to the reversible exchange reaction of imine bonds, making them degradable and reprocessable. Surprisingly, BOB/ETOD also had excellent antimicrobial (the antimicrobial rate was up to 93%) and UV-blocking properties. This work provides a simple and effective solution for the development of multifunctional epoxy-based vitrimers, which is conducive to further expanding the application field of epoxy resins.
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高影响因子
ACS Photonics
·
2023
·
IF 7
Panpan Hao,Wei Jiang,Mengjie Li,Mufang Li,Qiongzhen Liu,Liyan Yang,Yan Tan,Yuedan Wang,Dong Wang
A novel flexible photodetector using yarn-based phototransistors is reported for the first-time. Reduced graphene oxide (rGO) doped with poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) (PEDOT:PSS) was prepared by simple solution processing and coated by tungsten disulfide quantum dots (WS2 QDs) for novel yarn-based phototransistors (YPTs). The transistor-based photodetector exhibits good p-type transistor behavior and high transconductance (4.7 mS). The YPTs with an rGO-PEDOT:PSS/WS2 QDs heterojunction as the photosensitive layer are regulated by different light wavelength, light power, and gate voltage with UV–visible light. It is observed that the highest photoresponsivity of the device (Rmax) is 4.42 × 102 A/W under 365 nm UV light, the maximum specific detectivity (D*max) is 2.86 × 1011 Jones, and the fast response and recovery times are 1.78 and 2.91 s under a broad wavelength range, respectively. This excellent performance can be attributed to the synergistic effect of the WS2 QDs/rGO-PEDOT:PSS composites. In addition, the fully flexible phototransistor prepared by composite nanomaterials coated on viscose yarn still maintains a stable performance under different bending states and has been successfully applied in the field of UV–visible visual detection and intelligent wearable optoelectronics. These results pave a simple route for the development of wearable, high-performance optoelectronic devices.
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高影响因子
Materials
·
2023
·Vol. 16
·期 17
·5911
·
IF 3.4
Juan Wang,Zhikai Dong,Jingwen Chen,Shuangjun Chen
UV debonding acrylate adhesive (UDAA) plays a crucial role in the semiconductor industry, where its excellent adhesion is required to ensure the stability of silicon wafers and leave no residue on the surface after UV irradiation. The necessary UV debonding is achieved through the formation of rigid networks by the reactions of all the vinyl groups in the system. Acrylate copolymers with vinyl groups are typically obtained by the grafting reaction of isocyanate with a side-chain hydroxyl comonomer. However, these grafting reactions easily fail due to early cross-link formation. In this study, we illustrate a straightforward method for preparing UDAA by conducting a postgrafting reaction after one-step mixing of isocyanate functional monomer (IPDI-H) and hydroxyl acrylate copolymers (BA-H), thereby skipping the abovementioned vinyl grafting process. The chemical structures of the synthesized IPDI-H and BA-H were confirmed using Fourier transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance (1H-NMR) analysis. Gel permeation chromatography (GPC) was employed to determine their molecular weights, while differential scanning calorimetry (DSC) was used to determine their glass transition temperatures. The postgrafting reactions successfully introduced vinyl groups onto the polyacrylate copolymer chains, resulting in high bonding strength during use and a significant decrease in peeling strength after UV irradiation. Rheological methods, including the three-interval thixotropy test (3ITT) and tack test modes, were employed to characterize a series of acrylate UV debonding adhesives. The recovery percentage of the storage modulus in the 3ITT mode indicated that a 0.6 wt% isocyanate curing agent made the UV debonding adhesives resistant to deformation. From the maximum normal force in the tack test mode, it was found that UDAA with 10 wt% PETA monomer and 30 wt% C5 tackifying resin exhibited excellent combined adhesion and debonding properties, which were further confirmed by peel strength tests. Microscope images of the wafer surfaces after removing the adhesive tapes demonstrated the excellent UV debonding properties achieved after 40 s of UV irradiation through the postgrafting reaction. The prepared UDAA has excellent properties; the peel strength can reach 15 N/25 mm before UV irradiation and can be reduced to 0.5 N/25 mm after ultraviolet irradiation. This research establishes a comprehensive method for understanding and applying UDAA in various applications.Keywords:UV debonding adhesives;acrylates;postgrafting;cross-linking;rheology
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PubMed
高影响因子
Journal of Cleaner Production
·
2023
·
IF 11.1
Tan Meng,Xiao Su,Peizhe Sun,Wenjun Sun,Domenico Santoro,Hong Yao,Hui Wang
UV-based advanced oxidation processes (UV-based AOPs) via photolysis of radical precursor chemicals (RPCs) are among the most effective technologies for eliminating trace organic contaminants in water treatment facilities. However, mathematical discussions on the kinetics and energy consumption for the engineering photoreactor set-up of UV-based AOPs, especially the newly proposed UV-based AOPs (e.g., UV/persulfate, UV/chlorine and UV/chloramine), are scarce. In this study, a photoreactor with reflective sleeves was mathematically characterized and validated using clean and complex water matrices, and approaches for measuring effective light absorbance by RPC ( I RPC ) and the reflectance of the photoreactor wall ( η ) were proposed. By applying I RPC and η , and employing geosmin as a model compound, energy optimization of the UV-based AOPs was conducted based on an updated kinetic model . A new equation was derived for UV/H 2 O 2 to obtain the most cost-effective RPC dose regarding EE/O ( electric energy required for one order of contaminant removal ) ( C opt-EE/O ). This equation was then successfully extended to other UV-based AOPs (including UV/persulfate, UV/chlorine, and UV/chloramine). The balance between the treatment goals and operational costs was also discussed. Overall, the new concepts and approaches proposed in this study may aid in the energy optimization and reduce RPC consumption of various UV-based AOPs for engineering applications .
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高影响因子
BIOTECHNOLOGY AND APPLIED BIOCHEMISTRY
·
2023
·Vol. 70
·期 6
·1806-1816
·
IF 2.8
Jing Zhou,Si-Jia Miao,Shi-Zhong Yang,Jin-Feng Liu,Hong-Ze Gang,Bo-Zhong Mu
Rhamnolipid, as a low-toxic, biodegradable and environmentally friendly biosurfactant, has broad application prospects in many industries. However, the quantitative determination of rhamnolipid is still a challenging task. Here, a new sensitive method for the quantitative analysis of rhamnolipid based on a simple derivatization reaction was developed. In this study, 3-[3′-( l -rhamnopyranosyloxy) decanoyloxy] decanoic acid (Rha-C10-C10) and 3-[3′-(2′- O -α- l -rhamnopyranosyloxy) decanoyloxy] decanoic acid (Rha-Rha-C10-C10) were utilized as the representative rhamnolipids. Liquid chromatography–mass spectrometry and high-performance liquid chromatography-ultra violet results showed that these two compounds were successfully labeled with 1 N1-(4-nitrophenyl)-1,2-ethylenediamine. There was an excellent linear relationship between rhamnolipid concentration and peak area of labeled rhamnolipid. The detection limits of the Rha-C10-C10 and Rha-Rha-C10-C10 were 0.018 mg/L (36 nmol/L) and 0.014 mg/L (22 nmol/L), respectively. The established amidation method was suitable for the accurate analysis of rhamnolipids in the biotechnological process. The method had good reproducibility with the relative standard deviation of 0.96% and 0.79%, respectively, and sufficient accuracy with a recovery of 96%–100%. This method was applied to quantitative analysis of 10 rhamnolipid homologs metabolized by Pseudomonas aeruginosa LJ-8. The single labeling method was used for the quantitative analysis of multiple components, which provided an effective method for the quality evaluation of other glycolipids with carboxyl groups.
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PubMed
高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Yangzhong Zhao,Tianhao Li,Yanpei Dang,Erxiao Wu,Jiaqi Sun,Xiao Zhang,Shiyu Du,Xiaoling Liu,Xiaosu Yi,Ping Cui,Yujie Song,Liu He
UV irradiation is a well-established and effective process for polymer curing. However, it has been largely ignored in the field of polymer-derived ceramics (PDCs) due to its intricate mechanism and strict requirements for the precursor molecular structure. The current work designs and synthesizes a series of UV-curable polyborosilazanes containing various vinyl groups, simultaneously examines the effect of UV curing, and investigates the mechanism of curing. Cyclization mechanisms involving vinyl-free radicals and silyl-free radicals are postulated based on the molecular structure of the precursor before and after curing. The ceramic yield of UV-cured precursors is increased by up to 9.0 wt %. Moreover, SiBCN ceramics, pyrolyzed from UV-cured precursors, exhibit excellent thermal stability and remain amorphous at temperatures of up to 1600 °C. The mechanistic interpretation of UV curing opens horizons for the design and application of UV-curable ceramic precursors.
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高影响因子
危险品化学品经营许可证（带存储）