Coatings
·
2023
·Vol. 13
·期 1
·110
·
IF 3.4
Xixi Yu,Yun Hu,Wen Lei,Chengguo Liu,Yonghong Zhou
Developing environmentally friendly UV-curable polymers with multi-functionality is very significant for sustainable development and environmental protection. In this work, a novel tung-oil-based UV-curable oligomer (TOMAH) was synthesized by Diels–Alder and ring-opening reactions via microwave technology. Subsequently, catalyst-free self-healing UV-curable materials based on a maleate monoester transesterification (MMETER) were developed by co-photopolymerization of TOMAH and hydroxyethyl methacrylate (HEMA). The obtained UV-cured materials possessed a high glass transition temperature (Tg> 81 °C), excellent adhesion (grade 1), and flexibility (2 mm). Particularly, the outstanding photopolymerization activity of the UV-curable resins was proved by UV-curing kinetics. In addition, dynamic transesterifications occurred without an external catalyst at a moderate temperature, resulting in good self-healing properties (with a scratch-repair efficiency of 78.6–93.3%) and shape-memory properties for the obtained UV-cured materials. This work combines the multiple advantages of biomass raw material, microwave synthesis technology, UV-curing method, and multifunctional polymers, thus providing an innovative strategy to fabricate sustainable and intelligent coatings.Keywords:UV-curable coatings;self-healing;tung oil;catalyst-free;microwave technology
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 11
·5330-5337
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IF 3.3
Yu Wang,Rao Chen,Dongmei Liu,Chaofei Peng,Junwei Wang,Xiaoqing Dong
The development of effective Vis-sensitive photoinitiators for light-emitting diode (LED) polymerization is still an emerging challenge as LEDs are being developed into the predominant light sources. In this work, a series of new functionalized photoinitiators, containing thioxanthones and oxime-esters as functional groups, was designed and straightforwardly synthesized in two steps. The structures of the photoinitiators were studied using 1H NMR, 13C NMR, and high-resolution mass spectrometry. The conclusion of the photophysical properties indicated that the long wavelength absorptions from 360 nm to 405 nm made the investigated thioxanthone derivatives quite appealing as a valuable photoinitiator under UV-Vis LEDs. The structure–reactivity relationship was also studied in detail through real-time FTIR spectroscopy. A possible photolysis mechanism was expected based on further photolysis and online 1H NMR activities. With a proper molecular design, the new functionalized photoinitiators were synthesised straightforwardly and they displayed more advanced initiation abilities than their parent thioxanthone.
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POLYMER COMPOSITES
·
2023
·Vol. 44
·期 9
·6083-6096
·
IF 5.2
Jingyi Nie,Jianfei Liao,Danni Wang,Meiyun Zhang,Zhaoqing Lu,Bin Yang
Aramid materials have been applied in many important civil and military fields. But a major drawback to aramid materials is the susceptibility to UV-induced damage. In this work, aramid nanofibers (ANFs) and ANF/nano-ZnO composites were used to protect aramid materials from UV-induced damage. ANF protective layer was created on the surface of aramid fibers, and the ANF-coated aramid fibers could be further prepared to aramid paper. Moreover, ANF/nano-ZnO composites were synthesized and used for stronger UV-blocking ability. ANFs provided effective protection to aramid material. The properties after UV exposure (about 9.3 years in the natural environment) were largely improved: ANFs improved the retention rate of strength by 17.96% for aramid fibers and by 16.93% for aramid paper. ANFs also showed synergistic effect with UV-absorbing inorganic nanoparticles. After UV exposure, the tensile strength of aramid paper with ANF/nano-ZnO composites was even higher than the initial value (121.55%), and the retention rate of strength was 2.43 times higher than the original aramid paper.
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Nanomaterials
·
2023
·Vol. 13
·期 13
·1985
·
IF 5.3
Hong-Lan Huang,Qi-Kai Shi,Yan Deng,Xiang-Yang Lei,Qing-Huang Zhang,Jin-Ju Chen,Xue-Ran Deng
In order to improve laser transmission efficiency at 1053 nm and 527 nm, a potassium deuterium phosphate (DKDP) crystal (a key component of high-power laser systems) needs a bi-layer antireflection coating system on its incident surface. UV-curable polysiloxane coatings with a refractive index varying from 1.500 to 1.485 were prepared through the polycondensation of a methacryloxy propyl trimethoxylsilane (MPS) monomer with a controllable degree of hydrolysis. Additionally, the influence rule of the coating structure on the refractive index was intensively studied, and the primary factors that dominate the hydrolysis process were discussed. Further refractive index adjustment was achieved using only a small amount of dopant based on the polysiloxane coating with refractive index of 1.485, allowing for high antireflection of the bi-layer coating system at desired wavelengths to be achieved. In addition, high laser damage resistance and remarkable mechanical properties of the coating were simultaneously realized through the incorporation of a minor quantity of dopants, which benefited from the successful modulation of the intrinsic refractive index of the polysiloxane coating.Keywords:controllable hydrolysis;UV-curable polysiloxane coating;refractive index modulation;laser damage resistance;mechanical property
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高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 49
·2304430
·
IF 29.4
Xianmei Huang,Shuqiang Peng,Longhui Zheng,Dongxian Zhuo,Lixin Wu,Zixiang Weng
Elastomers prepared via vat photopolymerizationus ually exhibit unsatisfied mechanical properties owing to their insufficient growth of molecular weight upon UV exposure. Increasing the weight ratio of oligomer in the resin system is an effective approach to enhance the mechanical properties, yet the viscosity of the UV-curable resin increases dramatically; this hinders its printing. In this study, a linear scan-based vat photopolymerization (LSVP) system which can print high-viscosity resins is implemented to 3D print the oligomer-dominated UV-curable resin via a dual-curing mechanism. A polyurethane methacrylate blocking oligomer is first synthesized and then mixed with a commercialized bifunctional oligomer, photoinitiator, and primary amine as a chain extender to prepare high-viscosity UV-curable resin for the LSVP system. The deblocked isocyanate is further crosslinked with a chain extender via thermal treatment to construct a highly entangled polymer chain network. The optimal thermal treatment parameters are investigated, and the resilience of the 3D-printed elastomer is evaluated through continuous tensile loading and unloading tests. Subsequently, complex structured elastomers are printed, exhibiting favorable mechanical durability without defects. The results obtained from this work will provide a reference for preparing elastomeric devices with excellent physical properties and expand the application scope of vat photopolymerization to new fields.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Jiemin Qiu,Danhong Zeng,Yichun Lin,Weihao Ye,Congcong Chen,Zhiqiang Xu,Guangqi Hu,Yingliang Liu
In previous reports, carbon dots (CDs) were customarily used as fluorescent probes to detect heavy metal ions. However, scientists neglected to take advantage of the excellent UV absorption properties of CDs to detect heavy metal ions. Herein, we synthesized nitrogen-containing carbon polymer dots ( N -CPDs) for the determination of Co 2+ ions in water samples by a one-step hydrothermal method using l -histidine and ethylene imine polymer as raw materials. The N -CPDs were characterized by ultraviolet–visible spectrum (UV–vis), infrared spectrum (FT-IR), X-ray photoelectron spectrum (XPS) and transmission electron microscopy (TEM) techniques. They possess superior full-band UV absorption performance and the surface is rich in multifunctional groups such as –COOH, –C N–, –OH, etc. When Co 2+ was added to N -CPDs solution, the color of the solution rapidly changed from colorless to yellow–brown, which was visible to the naked eye. The UV absorption intensity of N -CPDs changed, and the fluorescence was instantly quenched, due to the formation of chelate between Co 2+ and N -CPDs, and the FRET process occurred. The detection of Co 2+ showed good linearity for both fluorescence and UV absorption spectroscopy modes in the range of 0–200 μM, and the limit of detection were 1.0023 μM and 0.75 μM, respectively. These two methods have the advantages of simple operation, remarkable selectivity and small sample size, which can be applied to the field detection of Co 2+ in water samples. It is possible to develop the UV absorption properties of CDs to detect the ions.
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CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Biyang Zhu,Yifan Chen,Shiyuan Chang,Huamai Qiu,Lijun You
Kinetic models and mechanism of isomaltooligosaccharides (IMOs) by hydroxyl ( OH) radicals-driven degradation in ultraviolet/hydrogen peroxide system were investigated. Electron paramagnetic resonance spectra indicated that UV radiation played an important role in the steady generation of OH radicals. The OH radicals could effectively decrease the molecular weight of IMOs and significantly oxidize hydroxy group into carbonyl and carboxy groups . Main components of IMOs were separated and identified by HPAEC-PAD and UHPLC-MS/MS methods. Degradation behaviors of IMOs were well fitted to pseudo first-order kinetics. The hydrogen abstraction by OH radicals from different C H sites at pyranose ring began a cascade reaction leading to cleavage of α-glycosidic linkage or C C bonds with formation of stable uronic/aldonic acids. Degradation rate was closely influenced by the degree of polymerization (DP) of IMOs, the initial concentrations of IMOs and H 2 O 2 . The results would pave the way for free radicals-driven degradation of polysaccharides .
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Yangtao Wu,Dongxu Qu,Lingjun Bu,Shumin Zhu,Shiqing Zhou
This study explored the risk of trichloronitromethane (TCNM) formation during chlorination of the nitrite-containing water after pre-chlorination and subsequent UV irradiation (i.e., the chlorine-UV process). The competitive reaction between amino acid (AA) and NO 2 − for chlorine produced organic chloramine and reduced the oxidation from NO 2 − to NO 3 − , resulting in a significant enhancement of TCNM in the presence of AA (>5.52 μg L −1 ) as compared to the absence of AA (0.42 μg L −1 ). The generation of HO • during UV photolysis of organic chloramines was confirmed. Among the process parameters, pre-chlorination time (from 5 min to 30 min) had no significant effect on TCNM formation; the highest TCNM formation occurred at pH 7 (from pH 6 to pH 8); prolonged UV irradiation time (from 5 min to 30 min) and increased chlorine to AA ratio (Cl 2 :AA) (from 1 to 3) decreased the TCNM formation. The hydroxylated, chlorinated and nitrosated products were detected. The quantum chemical calculation results indicated the attack of NO 2 • was more likely to occur at the meta and para positions of benzoic acid (BZA), because of the steric hindrance of the carboxylic group in BZA to the ortho position. Based on the results of the toxicity assessment, pre-chlorination with a higher chlorine dosage could be an effective method of controlling both TCNM formation and acute toxicity. Overall, the results of this study contributed to the understanding of the TCNM formation mechanism as well as optimizing the parameters of the chlorine-UV process to reduce the risk of TCNM formation.
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ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Aicheng Zhang,Xuwen Wu,Xinping Ouyang,Hongming Lou,Dongjie Yang,Yong Qian,Xueqing Qiu
Inspired by the UV-blocking of lignin in plants and the adhesion of catechol in mussel dopamine, light-colored lignin-based microcapsules ((OMC + BMDM)/LS-OH3-T) with strengthened UV-blocking and good bioadhesion were obtained by demethylation modification of sodium lignosulfonate (LS) and encapsulation of chemical sunscreen actives. The results show that the adhesion between LS and skin improved from 0.158 to 0.173 mN/m due to the formation of catechol groups. When (OMC + BMDM)/LS-OH3-T was used as the unique active ingredient in the sunscreen, the sun protection factor (SPF) reached 86.67, fully meeting the daily sunscreen requirement. In addition, the color of microcapsule-based sunscreen was close to pure white, which effectively solves the dark color problem of the existing lignin-based sunscreens. As it demonstrates good biocompatibility, this new light-colored lignin-based sunscreen agent has good application potential in the skincare field.
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Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 25
·13355-13367
·
IF 14.511
Bowen Wang,Ji Pan,Xiuyang Zou,Junliang Zhao,Guodong Xu,Zhiyu Jin,Zhe Sun,Feng Yan
The ionomer binder is crucial for the preparation of homogeneous catalyst layers for anion exchange membrane fuel cells (AEMFCs). However, the dense stacking of the ionomer on the catalyst surface results in large resistance to gas (especially O2) penetration in the three-phase boundary (TPB). Here, an in situ UV-driven gas “expressway” for the catalyst layer of AEMFCs was prepared by a rigid anthracene-based cross-linkable ionomer. The gas permeability of the catalyst layer was increased by 130% after crosslinking due to the high free volume between the ionomer chain segments. Meanwhile, the electrochemical and identical location transmission electron microscopy (IL-TEM) characterizations showed that the crosslinked ionomer binders played an anchoring role for the catalyst particles. The performance of an H2/O2 AEMFC (based on commercialized FAA-3-50 membranes) containing the crosslinked ionomer is much better than that of the uncrosslinked PPOAN ionomer. The in situ UV-driven crosslinking strategy of catalyst layers provides new insights into the preparation of homogeneous mesoscopic structures for the catalyst particles. More importantly, the rigid anthracene-based crosslinked structure constructs microscopic gas channels in the ionomer–catalyst interface, which has been overlooked in previous work.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Jincai Peng,Yuehong Peng,Tianhui Wang,Zhijie Wu,Qi Wang,Yongjin Li,Zhaoyi Yin,Jin Han,Jianbei Qiu,Zhengwen Yang,Zhiguo Song
In order to make the most of solar energy, the development of efficient UV–Vis–NIR activated photocatalysts has attracted more and more attention. In this study, the UV–Vis–NIR broad spectrum activated photocatalysts La-doped BaBiO 2 Cl with abundant oxygen vacancies (OVs) were successfully prepared by solid state reaction . The experimental results and theoretical calculations revealed that La doping induced OVs in BaBiO 2 Cl, formed an intermediate level, extended the light absorption to the NIR region, and promoted carrier separation efficiency. Owing to the synergistic promotion effect, the optimal BaBiO 2 Cl–3%La exhibited obviously enhanced photodegradation rate, which was about 3.26 times higher than that of pure BaBiO 2 Cl under UV–Vis–NIR light irradiation . This work provides a resultful strategy for designing new full-spectrum-activated photocatalysts for environmental protection.
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ACS Applied Nano Materials
·
2022
·
IF 6.14
Congcong Chen,Zhiqiang Xu,Jiemin Qiu,Weihao Ye,Xiaokai Xu,Ruizhe Wang,Chaofan Hu,Jianle Zhuang,Bingfu Lei,Wei Li,Xuejie Zhang,Guangqi Hu,Yingliang Liu
Our skin and materials are constantly exposed to detrimental ultraviolet light (UV) rays from the sun. It is essential to protect our health and the life of materials by intercepting this detrimental high-energy radiation with UV absorbers. Carbon dots (CDs) with low toxicity and low cost have brought a choice for UV absorbers. However, high-efficiency absorption CDs that can achieve absorption in the full ultraviolet region have rarely been reported. Herein, we synthesized a full-band carbon dot ultraviolet absorber by expanding the CD π-conjugation domain. In addition, by encapsulating CDs in a polyurethane (PU) matrix, the absorptivity of the 5 wt % CDs@PU film in the ultraviolet region was 100%, and the transmittance reached 90% in the visible region, successfully protecting the two dyes from photodegradation. The UV shielding efficiency slightly decreased under the accelerated aging experiment of 288 h. Moreover, to remove the ultraviolet light in the light-emitting diode (LED), we applied a layer of the CD film to the surface of the LED lamp, and the results indicated that the UV light was successfully blocked by the CD film without affecting the LED luminescence performance. This study offers a valid method to evolve high-efficiency, nontoxic antiaging materials and healthy lighting devices.
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