POLYMER DEGRADATION AND STABILITY
·
2025
·
IF 7.4
Hongjin Wang,Ao Qin,Yue Xu,Miaojun Xu,Bin Li,Lubin Liu
The rapid development of emerging fields has put forward stricter requirements for the comprehensive properties of flame retardant thermoplastic polyurethane (TPU). Traditional phosphorus-nitrogen flame retardants needed high loading levels to achieve flame retardancy in TPU, resulting in significantly reduced mechanical performance and aging resistance of TPU composites. In this study, a novel flame retardant N-((diphenylphosphoryl)oxy)-P, P-diphenylphosphinic amide (NDPA), containing multiple flame retardant groups was successfully synthesized by introducing N O endowed with gas phase radical trapping capability while regulating P-C and P-O within a phosphorus-nitrogen flame retardant structure. Merely 2 wt% NDPA enabled TPU to achieve the UL-94 V-0 rating, with the limiting oxygen index (LOI) rising to 30.1 %. The flame retardant mechanism analysis showed that NDPA played an excellent free radical quenching effect in gas phase, and promoted the formation of expanded and high-quality shielding char layers in TPU composites, which significantly improved the flame retardancy of TPU composites. Therefore, the peak heat release rate and total heat release of TPU/NDPA2 composites were decreased by 49.7 % and 28.1 % compared with pure TPU. Meanwhile, due to the good compatibility and uniform dispersion of NDPA in the TPU matrix, the TPU/NDPA composites retained their original transparency and mechanical properties. Additionally, the conjugated aromatic structure of NDPA bestowed TPU composites with excellent UV shielding performance. This study demonstrated that the synthesized TPU/NDPA composites achieved the optimal balance of flame retardancy, transparency, UV shielding, and mechanical properties, providing an innovative scheme for the design of high-performance TPU composites.
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DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Hongxia Gao,Ronghua Tang,Yao Sun,Xiangyue Zheng,Qianru Chen,Bing Liu,Qingjun Meng,Yang Xu
In this research, a novel strategy was developed to fabricate multifunctional carboxymethyl cellulose (CMC)-based films endowed with flame retardancy, UV resistance, and hydrophobicity. Phenylphosphonic acid (PPOA) and urea were employed as phosphorus and nitrogen group introducing agents, tea polyphenol (TP) and lignin served as char layer enhancers and multifunctional enhancers. The successful synthesis of the CMC-Lignin-PPOA-TP-urea composite (CMC-PUTP/L) was verified by scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The obtained CMC-PUTP/L film exhibited significant flame retardancy with a limiting oxygen index (LOI) of 35.2 % and UL-94 V0 rating, a reduction in peak heat release rate (PHRR) and total heat release (THR) by 57.37 % and 23.16 %, respectively. In addition, the film demonstrated a high ultraviolet protection factor (UPF) of 904.3 and a water contact angle of 109.8°, confirming its sufficient UV-blocking performance and hydrophobicity. It is obvious that the established approach may support a potential strategy, for overcoming the endogenous defect of CMC- even biomass-based films with flame retardancy, UV resistance, and hydrophobicity, to satisfy the requirements in various application scenarios.
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高影响因子
Journal of Coatings Technology and Research
·
2025
·
IF 2.8
Su Xinyong,Wang Jinwei,Zheng Caiyuan,Tang Can,Li Xueguo
Fast UV-curable coatings were prepared through thiol-ene reaction in 10 s, and their waterproof performance was evaluated in different aqueous conditions. The FTIR spectra showed that UV polybutadiene (PB) coatings could be successfully prepared by using mercaptan pentaerythritol tetra (3-mercapto propionate) (PETMP) as the crosslinking agent reacting with maleic anhydride-grafted polybutadiene under photo initiator. Their gel content increased from about 78–92% with the addition of PETMP from 10% to 20%, and then, this increment was less than 2% with the addition of PETMP from 20% to 30%. Their water absorption rate decreased from about 7%–4% with the addition of PETMP up to 20%−25% after 240 h immersion in DI water. The coating containing 25% PETMP demonstrated a significant cleanliness relative to that of plywood and the other coatings as observed from the stain flushing test. The EIS impedance after 96 h immersion revealed a great enhancement in corrosion resistance with the addition of PETMP at about 20%–25%, while the decline in impedance for the coating with 30% PETMP implied the probable aggregation of excessive PETMP; these were confirmed by the semi-immersion test in which the sample containing 20% PETMP exhibited much better salt water resistance than that of the other samples after 168 h immersion in 3.5% NaCl solution. An appropriate addition of PETMP at around 20%–25% resulted in a high crosslinking degree that enhanced waterproof performances of UV-cured PB coatings in DI water, stain water, and salt water. This study provides valuable reference in designing fast UV-curable coatings with good water resistance used as electronic packaging sealants, flexible protective coatings, and so on.
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高影响因子
OZONE-SCIENCE & ENGINEERING
·
2018
·
IF 1.232
Siyuan Wang,Xinghao Wang,Jing Chen,Ruijuan Qu,Zunyao Wang
Benzophenone-2 (BP-2) is an important type of UV filter that has been widely used and detected in the aquatic environment with greater estrogenic toxicity. In our work, the removal of BP-2 with the initial concentration of 25 mg L−1 was first carried out by ozone at different pH (ranging from pH 3.0 to 11.0), and we found a positive correlation between the pH values and the degradation efficiency of BP-2, among which the more rapid removal of BP-2 in alkaline condition was observed than acidic and neutral conditions. For the influence of aqueous humic acid (HA, the concentration ranged from 0 ppm to 100 ppm), the degradation rate of BP-2 by ozonation was first increased with the growth of humic acid concentration (from 0 ppm to 5 ppm), reaching to maximum at 5 ppm of HA and subsequently decreased with the growth of HA concentration (from 5 ppm to 100 ppm). Fourteen intermediate products in the ozonation process were distinguished by an electrospray time-of-flight mass spectrometer and then two degradation pathways were proposed. Through the theoretical calculation, we found the carbanyl group of BP-2 has the most reactivity to be easily attacked by ozone, providing us guides and theoretical basis on the supposed intermediate products. Furthermore, the P. phosphoreum acute toxicity test was conducted to evaluate the potential toxicity during the ozonation process.
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DOI
高影响因子
FIBERS AND POLYMERS
·
2024
·Vol. 25
·期 3
·765-774
·
IF 2.2
Zhang Tao,Chen Yu,Shao Xue,Wang Zhuoqun,Qiu Fengxian
Plastic agricultural films offer a favorable internal environmental climate for plant growth, boosting crop yields, however, to pursue green ecological agriculture, renewable biodegradable materials become attractive candidates to replace non-degradable petrochemical plastic agricultural films. Herein, this work presents a general strategy to fabricate the transparent and biodegradable cellulose-based film with good hydrophobicity and excellent UV resistance using corn husk and lignosulfonate (LS) as primary materials, and methyltrimethoxysilane (MTMS) as surface modifier for potential agriculture application. The results show that the LS uniformly attaches to the surface of the regenerated cellulose (RC) film, and inherits the excellent tensile strength (20.1 MPa) of the RC film after modification, forming a film that resists a certain tensile force and good thermal stability. Due to the excellent UV absorbing ability, the MTMS-modified RC/LS (M-RC/LS) film demonstrates excellent optical properties of shielding about 95% of UV light and allowing nearly 80% of visible light transmittance, providing the required light capacity for plant growth. In conducting water contact angle tests, the hydrophobic properties of the cellulose-based film are improved by surface modification of MTMS (water contact angle ≈ 100.9°), overcoming the drawback of insufficient stability of cellulose and improving its agricultural application possibilities. In addition, the synergistic effect of LS and MTMS results in a certain reduction of water vapor transmission rate of the cellulose-based film. Based on the above properties, the present study provides a facile strategy to prepare UV-resistant and transparent hydrophobic cellulose-based film, which is valuable to prolong their life and protect the safety of crops, promising to replace transparent plastic films for wider applications in agricultural films and other related fields.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2014
·
IF 2.235
Ren Liu,Junchao Zheng,Ruixi Guo,Jing Luo,Yan Yuan,Xiaoya Liu
A series of biobased UV-curable antibacterial resins were synthesized through modifying tannic acid (TA) with varied amount of glycidyl methacrylate (GMA). The obtained TA-based methacrylates exhibited good film-forming property and can be cross-linked under UV irradiation. Thus, antibacterial functionalities can be tethered in the coating matrix, eliminating the loss of antibacterial ingredients. The antibacterial properties of resins and corresponding coatings against Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli were tested. The resins with high content of phenolic hydroxyl groups retained strong antibacterial ability while the ones with a relatively low content of phenolic hydroxyl groups did not, which indicated that the antimicrobial effects of TA greatly depended on the content of phenolic hydroxyl groups. The applications of UV-curable antibacterial resins in coatings were also studied. The cured coatings of TA-G5 resins with the highest content of phenolic hydroxyl groups exhibited the highest antibacterial activity with 5 log reduction. The basic properties of UV-cured coatings were also fully characterized, and the results demonstrated that the novel UV-curable resins had potential applications in UV-curable antibacterial coatings.
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高影响因子
PROGRESS IN ORGANIC COATINGS
·
2016
·
IF 2.632
Jianquan Tan,Weiqu Liu,Honglei Wang,Yang Sun,Shijian Wang
A novel waterborne UV-curable comb-like (meth)acrylate graft copolymer containing long fluorinated side chains (UVWCAC) was synthesized by conventional radical copolymerization of a novel mono-methacryloyloxy terminated fluorinated macromonomer (PHFBMA-GMA) and (meth)acrylate monomers. GPC, FTIR and 1 H NMR were employed to characterize the structure of the polymers. The influence of both the molecular weight and concentration of PHFBMA-GMA on the properties of UV-cured films was investigated. Hydrophobic surface could be obtained with just small amount of PHFBMA-GMA copolymerized into the polymer. The surface energy of UV-cured films decreased as both the concentration and the molecular weight of PHFBMA-GMA increased. The surface composition of the graft copolymer was characterized by XPS. XPS results confirmed the enrichment of the fluorine atoms on the surface quantitatively. In addition, the physical properties of UVWCAC UV-cured films, such as gel content, water absorption, pencil hardness, adhesion, chemical resistance, mechanical properties, optical transmittance and thermal properties were also investigated in detail. The novel UVWCAC prepared via conventional radical polymerization not only had excellent properties but also had the prominent potential application in large scale industrialization.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 46
·48210
·
IF 2.188
Lixiang Shen,Yingying Lai,Heqing Fu
In this work, a flower clusters-like superhydrophobic surface was fabricated via an ultraviolet (UV) curable coating of octadecylamine (ODA) and vinyl-terminated polydimethylsiloxane (V-PDMS). ODA self-assembled into many flower clusters-like structures on the surface of the coating, increasing the roughness of the coating surface without additional nanoparticles. V-PDMS formed a highly crosslinked network under a UV lamp, which would be helpful for a robust superhydrophobic surface. The obtained PDMS/ODA fabric showed water contact angle of 161° and sliding angle of 5°. The durability of the superhydrophobic surface was tested by water impacting, tube brush scrubbing, knife scratching, hand twisting, finger pressing, tape adhesion, abrasion, continuous rinsing, and chemical conditions. The experimental results indicated that the superhydrophobic surface have good durability for long service life. Moreover, the PDMS/ODA fabric could selectively absorb oils from water with good separation performance. This work will provide a facile, low cost, and versatile method to prepare superhydrophobic surfaces, and enhance their efficiency of oil–water separation. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 48210.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Yi Xia,Lei Xu,Sufang He,Liexing Zhou,Mingjun Wang,Jing Wang,Sridhar Komarneni
2D Transition metal dichalcogenide (TMDs) has been recognized as a potential candidate for constructing wearable and safe room temperature gas sensor. Especially, the heterostructures of TMDs/ metal oxide semiconductors (MOS) have been proved to be potential candidates as NO 2 sensors at room temperature. However, the response/recovery rate and reversibility of the sensors is still not satisfactory due to the inefficient charge transfer on TMDs/MOS hetero-interface. In this study, SnO 2 quantum dots (QDs) were simply decorated on the surface of few or single layer WS 2 nanosheets to form 2D/0D heterostructures via a facile room temperature aqueous solution process and self-assembly method. The 2D/0D WS 2 /SnO 2 heterostructure-based optoelectronic gas sensor showed fast response/recovery rates and full reversibility to NO 2 at room temperature with enhanced response. The remarkable improvement in NO 2 sensing was because of the efficient interfacial charge separation rendered by 2D/0D heterostructures under ultraviolet illumination. Therefore, this study points out a potential strategy for the design of light-enhanced gas sensing materials.
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高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 46
·16584-16592
·
IF 7.059
Sheng Wu,Puxian Xiong,Xiaoqi Liu,Yubin Fu,Quan Liu,Mingying Peng,Yan Chen,Zhijun Ma
A blue emitting phosphor Na2Y2B2O7:Bi3+ was synthesized by a solid state reaction method. The structure characteristics, concentration, temperature-dependent luminescence and light emitting diode (LED) device performance were systematically studied. Adjustable photoluminescence (PL) from blue to green under different excitation wavelengths from 320 to 390 nm was observed, which is attributed to the complex energy transfer between multiple Bi3+ centres. Moreover, strong absorption in the near ultraviolet region (350–400 nm) was observed in Na2Y2B2O7:Bi3+, which is desirable for LEDs excited by near ultraviolet chips. In addition, a thermal quenching experiment was carried out and the calculated activation energy was 0.28 eV, indicating that this new Na2Y2B2O7:Bi3+ phosphor has good thermal stability. Finally, we explored the application of the Na2Y2B2O7:Bi3+ phosphor by encapsulating LED devices. The device Commission of Illumination (CIE) coordinates are (0.3572, 0.3407), and a high color rendering index (CRI) of 91.1 and a low corresponding color temperature (CCT) of 4480 K under 60 mA current were recorded. These characteristics show that this phosphor can be used to prepare white LED devices excited by near ultraviolet chips.
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高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Xi Yu,Yansong Liu,Lixiao Gao,Li Wang,Xizhi Chen,Yuanlin Ren,Xiaohui Liu
To endow silk with multifunctionality and expand its application fields, the silk fabric was treated with protocatechualdehyde to prepare a novel silk fabric with Schiff base structure (CAT@Silk). Then, CAT@Silk was immersed in iron (III) solution to chelate Fe 3+ to obtain flame retardant , antibacterial and UV-resistant silk fabric (CAT@Fe@Silk). Compared with the limiting oxygen index (LOI) value of the original silk, the CAT@Fe@Silk increased from 23.3 % to 35.1 %, and remained 32.4 % even after 20 laundering cycles (LCs), indicating excellent flame retardant durability. The UV protection coefficient of CAT@Fe@Silk was 67.74, which was higher than that of the original sample (21.02). In addition, CAT@Fe@Silk had good antibacterial effects against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ). This work constructed a dynamic cross-linking network that mimicked the adhesion of mussels generating from the complexation of catechol groups and Fe 3+ ions (catechol-Fe 3+ ), which not only endowed silk fabric with good flame retardancy, but also with UV resistance and antibacterial properties, demonstrating good potential application.
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高影响因子
CARBOHYDRATE POLYMERS
·
2026
·
IF 13.2
Wei Tan,Jieyun Zhao,Lei Tan,Yin Tian,Guixiang Song,Ying Chang,Lu Bai,Ping Li,Yuanlin Ren,Xiaohui Liu
The inherent flammability and insufficient ultraviolet (UV) protection of regenerated cellulose fibers limit their functional applications. Inspired by the natural polyphenol–polysaccharide synergy in plants, a lignin-derived boron-containing phenolic network (Lig-BPF) was incorporated into a cellulose spinning system and then coordinated with Zn 2+ to fabricate Cellulose/Lig-BPF@Zn fibers. Compared with pristine cellulose fibers, Cellulose/Lig-BPF@Zn increased the char residue at 800 °C from 13.72% to 30.35% under N 2 atmosphere, and reduced the peak heat release rate by 43.03%. The limiting oxygen index increased from 17.2% to 31.5%, and still remained 29.1% after 20 laundering cycles. TG-FTIR analysis showed an 88.56% reduction in total volatile release intensity, while Raman analysis confirmed an increased degree of graphitization, as evidenced by a decreased I D /I G value from 3.59 to 2.55. Furthermore, the UV protection factor increased from 11.42 to 128.82, and remained 109.74 after durability testing. Mechanistic analyses demonstrate that lignin-derived aromatic domains, boron-containing structures and Zn-coordinated species regulate cellulose pyrolysis and promote the char formation. This work develops a sustainable strategy for converting natural lignin into a bio-based flame retardant that simultaneously improves the flame retardancy and UV protection performance of regenerated cellulose fibers, providing a phosphorus-free and eco-friendly approach for preparing multifunctional carbohydrate-based fibers.
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PubMed
高影响因子
危险品化学品经营许可证（带存储）