Polymers
·
2023
·Vol. 15
·期 13
·2806
·
IF 5
Haichuan Ye,Yuan He,Haichao Li,Tingting You,Feng Xu
Three-dimensional (3D) printing is regarded as a novel technique to realize the customized production of films. However, the relative lack of printable materials with excellent mechanical properties and tailored functionalities seriously restricts its wide application. Herein, a promising multifunctional 3D printing filament was fabricated by incorporating lignin into the polylactic acid (PLA) matrix and firstly applied to film production. The results indicate that lignin was an excellent mechanical reinforcement of the PLA matrix, especially for toughening. Only 0.5% lignin doping improved the toughness by 81.8%. Additionally, 3D-printed films with 0.5–5% lignin exhibited excellent ultraviolet (UV)-blocking capability of 87.4–99.9% for UVB and 65.6–99.8% for UVA, as well as remarkable antioxidant properties, ranging from 24.0% to 79.0%, and high levels of haze, ranging from 63.5% to 92.5%. Moreover, the prepared PLA/lignin (P/L) films based on 3D printing achieved the customization of film production and have potential applications in the fields of packaging, electronic products, medical care, and so forth. Overall, this work not only enriches the 3D printing composites with tailored multifunctionality but also brings the promising potential for the production of customized films.
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PubMed
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2023
·
IF 5.9
Ji Feng,Wenlong Luo,Wentao He,Xingxing Ai,Pingan Song
Developing flame retardant and UV-blocking polylactide (PLA) with reinforced mechanical properties is important but challenging. Herein, bio-derived phytic acid was decorated on halloysite nanotube though silane grafting, ring-opening reaction with melamine and then electrostatic interactions with phytic acid. The obtained phopsphorous-nitrogen-silicon decorated halloysite nanotube (PNSiHNT) was incorporated into PLA to prepare PLA composites. The surface modification significantly improved the compatibility between PNSiHNT and PLA, and the flame retardant, UV-shielding and mechanical properties of the composites were enhanced. At 5% mass loading, the peak heat release and total heat release were reduced by 18% and 12% compared to pure PLA, respectively, superior to most phytic acid-based flame retardants. The relevant mechanism analysis showed that PNSiHNT can restrain the emission of combustible volatiles and promote the formation of protective char layer. Moreover, the flame-retardant PLA showed excellent UV-shielding ability with an ultraviolet protection factor (UPF) value of around 120. Due to the reinforcing effect of PNSiHNT and the strong interfacial interactions between PNSiHNT and PLA matrix, the PLA/PNSiHNT showed 77% and 116% increase in tensile strength and elongation at break compared to the bulk PLA. This study provides a strategy for designing bio-derived organic/inorganic systems for enhancing flame retardant, UV-blocking and reinforced PLA.
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高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Yanan Shao,Xiaodong Li,Longbo Jiang,Xue Wei,Yanlan Zhao,Xuwu Chen,Shuai Li
UV/chlorine as an advanced oxidation process (AOPs) has been employed to treat contaminants. However, current research has primarily focused on drinking water and sewage treatment . This paper investigated the degradation of ciprofloxacin (CIP) by UV/chlorine treatment in hospital urine components that contain a higher concentration of iodine (I − ). The results indicated that the characteristic ions (HCO 3 − , SO 4 2− , and NH 4 + ) and I − in hospital urine inhibited CIP removal. In contrast, the characteristic ion, Cl − ion promoted this degradation reaction. Surprisingly, microgram levels of I − strongly inhibited CIP degradation. The characteristic ions can reduce the contribution of hydroxyl radicals (HO•) and reactive chlorine species (RCS). I − can decrease the contribution rate of HO• while slightly increasing the contribution of other radical oxidation in phosphate buffer solution (PBS) ascribed to the formation of HOI and reactive iodine species (RIS). Three degradation pathways have been proposed based on the main transformation products : hydroxylation , electron transfer , and halogen substitution. The piperazine ring of CIP was the main reactive group, and the N2, C10, C16, and C13 atoms were identified as reaction sites. Preliminary toxicity analysis suggested that the toxicity of hospital hydrolyzed urine containing iodine was higher than that of PBS.
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高影响因子
CELLULOSE
·
2022
·Vol. 30
·期 2
·1265-1285
·
IF 6.123
Zhao Jieyun,Su Xiaowei,Jiang Lina,Ren Yuanlin,Liu Xiaohui,Cheng Chunzu
A multifunctional lyocell fabric with flame retardant, antibacterial and ultraviolet (UV)-resistant properties was fabricated. First, a novel and efficient eco-friendly intumescent flame retardant was synthesized by using natural luffa as raw materials, and was applied to lyocell fabric to improve its flame retardancy. Then, the flame retardant lyocell fabric was treated by emodin to simultaneously obtain the antibacterial and UV-resistant properties. The surface morphology and chemical structure of the treated fabric were analyzed by scanning electron microscopy, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy, which confirmed the P–O–C covalent bond between the flame retardant and the fabric. Thermogravimetric, limiting oxygen index and cone calorimetry analysis demonstrated that the treated fabric possessed excellent char formation ability, thermal stability and flame retardancy. Thermogravimetric/infrared spectroscopy analyses of the treated fabric and the morphological study of the char residue after burning suggested that both gas-phase and condensed-phase mechanism contributed to the flame retardant improvement of lyocell fabric. In addition, after 20 laundering cycles, the treated fabric still maintained excellent flame retardant, antibacterial activity, and UV resistance properties. This study provided an eco-friendly and facile approach to produce lyocell fabric with multifunction of flame retardant, antibacterial and UV resistance. Graphical abstract
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Chun-Yang Li,Lu Yang,Jing Wang,Shi-Wen Lv,Jin Wang,Jing-Min Liu,Shuo Wang
For several decades, toxic thermally processed hazards, represented by heterocyclic amines (HCAs), have gradually become a challenge in the field of purification owing to their increasing exposure, wide variety, and the complexity of the matrix. In this study, the first example of degradation-removal of HCAs was illustrated by using a newly-integrated Fe/Co co-doped layered double hydroxide (FeCo-LDH) as photocatalysts based on sulfate radical advanced oxidation processes (SR-AOPs). Under the excitation of UV light, a FeCo-LDH/sodium persulfate (PS) photocatalytic degradation system combined with ultra-performance liquid chromatography mass spectrometer (UPLC-MS) was established. The synthesized photocatalysts were optimized by varying the Fe/Co ratio, and a series of photochemical activities and reaction conditions were investigated for a better performance. As a result, the FeCo-LDH/PS system was able to degrade 12 kinds of common HCAs efficiently and simultaneously, and was also well applicable in real edible oil samples with completely degraded. Moreover, it exhibited well reusability, preserving 97.75% of initial activity after being used for 5 cycles. It is the first application of photocatalytic combined with SR-AOPs technology for the degradation of HCAs and provides a promising example for the regulation of thermally processed hazards.
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Huimeng Feng,Wei Wang,Tong Wang,Lei Zhang,Wen Li,Jue Hou,Shougang Chen
Photo-induced self-healing composites have attracted more and more attention as a kind of materials that can be controlled remotely and accurately in real time. Here, we report a strategy of a photo-responsive system based on hydrogen and ion bonds capable of performing self-healing process by ultraviolet wavelengths, which is covalently cross-linked zinc-dimethylglyoxime-polyurethane coordination network with triple dynamic bonds. The recombination of hydrogen bond and metal coordination bond produces effective healing performance. The self-healing behavior and temperature dependence of 3D micro-crack is investigated by molecular dynamics simulations to reveal the mechanism of self-healing at molecular level. Moreover, the hybrid of copper-doped zinc oxide not only provides metal coordination bonds to enhance the self-healing rate, but also enhances the photothermal effect and anti-bacterial properties of polyurethane. Importantly, doping of copper generates more defects and forms a space charge layer on the surface of zinc oxide. The defects could trap surface electrons and holes, preventing the recombination of photo-induced electron-hole pairs, generating more heat through lattice vibration. Therefore, under ultraviolet light irradiation, the polyurethane can reach 62.7 °C for 60 s, and the scratches of the polyurethane can be healed within 30 min and fully healed within 1 h.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Lipeng Deng,Haizheng Hu,Yuchao Wang,Chao Wu,Huaile He,Jiaxin Li,Xiaobing Luo,Fabi Zhang,Daoyou Guo
Ga 2 O 3 is an ideal wide bandgap semiconductor for deep ultraviolet photodetectors due to the suitable band gap and excellent material stability, but the inevitable escape of oxygen ions from the lattices always leaves oxygen vacancies and leads to the persistent photoconductivity effect. Plasma treatment technology can use highly chemically active plasma to modify materials' surfaces at room temperature, which is environment-friendly and low carbon. In this work, we have prepared β -Ga 2 O 3 films by plasma-enhanced chemical vapor deposition (PECVD) and used plasma treatment to reduce the oxygen vacancies in-situ. Whereafter, we constructed a Schottky-type photodetector to explore the effect of plasma treatment on the photoelectronic properties of β -Ga 2 O 3 thin film. After plasma treatment, the oxygen vacancy reduces from 44.5 % to 27.3 %, and the photocurrent of β -Ga 2 O 3 photodetector increases from 11 nA to 67 nA at 0 V. Furthermore, the decrease of oxygen vacancy also improves the photoresponse speed (<0.2 s) of the photodetector. The present study provides an efficient treatment method of oxygen vacancies by plasma technology to obtain high-performance self-powered deep-ultraviolet photodetectors.
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高影响因子
EUROPEAN POLYMER JOURNAL
·
2022
·
IF 5.546
Xiaoqiang Zheng,Ying Tang,Yongping Bai
Novel photosensitive fluorinated polysiloxane (MA-PNFMS) overhanging with nonafluorohexyl and capped with methacrylate groups were synthesized. The UV-curable coatings were prepared using sulfhydryl functionalized fluorosilicone resin (SFSR) as an additive. The surface chemical composition and morphology, optical properties, adhesion, contact angles and surface energy, liquid repellency, and aging resistance were studied. Results show that the surface energy is as low as 19.0 mN/m, showing excellent liquid repellency. Liquids of varying surface tensions can slide down the inclined surface under gravity without any residue. The adhesion of the coating can reach 4B grade, the transmittance can reach 100%, and the haze is less than 0.6%. Furthermore, the coating also demonstrates excellent aging resistance, and its optical transparency and liquid repellency are maintained after UV and thermal aging. This study shows that MA-PNFMS could be applied as promising protective coatings.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Ruijin Li,Danlian Huang,Sha Chen,Lei Lei,Yashi Chen,Jiaxi Tao,Wei Zhou,Guangfu Wang
Lignin exhibits some antioxidant and UV protection due to its large number of phenolic hydroxyl and methoxy groups , which can be used in the field of sun protection. However, its complex macromolecular structure , high polydispersity , low solubility and deep coloration limit their development in the sunscreen field. In this work, we purified and separated lignin by solvent fractionation so that its phenolic hydroxyl content could be retained or even increased without modification. Consequently, by controlling environmental factors, lignin rapidly self-assembles into nanospheres without changing its structure, which not only achieves the standard of light-colored lignin but also meets the requirement of high sunscreen performance. It was measured that the lignin nanospheres formed by this method could meet more than 90% of UV blocking, especially for ultraviolet (UVA) fragments, when mixed with commercially available creams. It not only promotes the application of lignin in the field of sun protection, realizes the sustainable development of lignin, but also alleviates the problem of solid waste treatment and disposal.
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高影响因子
Environmental Science-Nano
·
2021
·Vol. 9
·期 1
·133-144
·
IF 8.131
Jingjing Du,Wenrui Qv,Gaozhong Pu,Mingxiang Qv,Jin Zhang,Wenfang Zhang,Hongzhong Zhang
Most intensively studied nanoparticles (NPs) possess photocatalytic activity. However, knowledge of the ecotoxicity of TiO2 NPs in response to the natural photoperiod remains scarce. To increase our understanding of the phototoxicity of TiO2 NPs toward aquatic fungal communities, regarding their structure and functioning, a microcosm experiment was conducted involving narrow-leaf cattail (Typha angustifolia) leaf decomposition with TiO2 NPs (50 mg L−1) under different light conditions (visible light, UV light, and the natural photoperiod) for 214 days. Although different light conditions led to significant variations in leaf decomposition, the decomposition rate was not significantly affected by TiO2 NP exposure under either visible or UV light, and it even increased by 15.19% under the natural photoperiod. During the ecological process, significant decreases were observed in the fungal biomass, overall microbial activity, and some extracellular enzymatic (cellobiohydrolase and polyphenol oxidase) activities. Also, TiO2 NPs under visible light and UV light reduced the fungal community diversity and led to the selection of some tolerant fungal species (e.g., Anguillospora longissima) that performed poorly in leaf decomposition under chronic exposure. The information provided here will help us to deeply evaluate the ecotoxicity of nanoparticles on freshwater ecosystem functioning under ambient light conditions.
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高影响因子
Polymer Chemistry
·
2023
·Vol. 15
·期 4
·276-291
·
IF 4.6
Yu Fan,Yanyun Li,Xinyuan Tang,Junying Zhang,Jue Cheng,Qingsong Lian
High encapsulation rates resulting from excellent compatibility between encapsulated solid–liquid phase change materials (SLPCMs) and cross-linking networks usually lead to high enthalpy loss for polymeric form-stable phase change materials (FSPCMs). Besides, the traditional thermal curing process for preparing polymeric FSPCMs requires a long time and causes much energy consumption. Therefore, the integration of a high encapsulation rate, low enthalpy loss, and an efficient photocuring strategy for designing polymeric FSPCMs is still a challenge. In this work, a series of fast ultraviolet (UV) curable and adjustable comb/bottlebrush epoxy/paraffin FSPCMs with high encapsulation rates and low enthalpy loss were designed and highly efficiently prepared through the chain extension reaction of epoxy resin and octadecylamine (ODA) followed by a photoinitiated thiol–ene click curing reaction. By adjusting the physical entanglement of the molecular chains, compatibility between the 3D cross-linking network and paraffin, and chemical cross-linking density, a high encapsulation rate of paraffin (60 wt%) and ultralow enthalpy loss (0.7%) can be achieved in only 13 min of the photocuring process, and the enthalpy value of the FSPCMs can reach 150.1 J g−1. The effects of the molecular weight, grafting density, and cross-linking density on the phase change properties were systematically discussed. Subsequently, through the introduction of Diels–Alder (D–A) bonds, the recycling and self-healing ability of the epoxy/paraffin FSPCMs was further achieved. This paper not only provides a strategy for preparing polymeric FSPCMs by the fast photocuring process but also can provide theoretical guidance for the optimization of the preparation of self-healing polymeric FSPCMs with high encapsulation rates and ultralow enthalpy loss.
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高影响因子
PROGRESS IN ORGANIC COATINGS
·
2017
·
IF 2.858
Yanju Lu,Zhendong Zhao,Yuxiang Chen,Jing Wang,Shichao Xu,Yan Gu
The rosin molecules can improve the adhesion and mechanical properties of polymers. It may be introduced either directly or via active functional groups. The focus of this work has been to develop a new method for creating such active functional groups connected to the acrylpimarate molecule by a microwave irradiation and phase-transfer catalytic reaction with allyl chloride. The synthesized monomer was then polymerized under ultraviolet (UV) irradiation. A new polymerization monomer with two functional groups (two allyl groups) has been synthesized through Diels-Alder reaction using levopimaric acid (an important component of rosin) as raw material under microwave irradiation. The yield and gas chromatography on content of the allyl acrylpimarate monomer were 92.2% and 98.6%, respectively. Due to the steric hindrance in the original rosin molecules, two major allyl acrylpimarate isomers in a 1:4 ratio were observed in the monomeric products, as confirmed by two-dimensional nuclear magnetic resonance spectroscopy (2D NMR). UV-curing reaction of the synthesized monomer confirmed that its two functional groups led to a novel polymerization pathway compared with that of the monomer bearing only one allyl group. Conversion of the monomer reached 90% by using Michlers ketone as a photoinitiator. The cured film was composed of a three-dimensional cross-linked polymer due to the bifunctional monomer, and showed good performance in terms of thermal stability, hardness, and chemical resistance.
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高影响因子
危险品化学品经营许可证（带存储）