ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Ming-Hui Yu,RuiXuan Xu,Wu-Xi Xie,Ya-Jin Li,Hong-Qi Nie,Qi-Long Yan
Aluminum hydride (AlH3) has attracted much attention due to its potential to replace aluminum (Al) as a novel energetic material in solid propellants. In this research, ammonium perchlorate (AP) and perfluoropolyether (PFPE) as functionalized coatings and a combination of acoustic resonance and spray drying technology have been employed to prepare AlH3@Al@AP (AHAPs) and AlH3@Al@AP@PFPE (AHAPs-F) energetic composite particles. The formulations of composite propellants and modified AlH3 particles were designed and fabricated. Their thermal reactivity, reaction heat, density, vacuum stability, combustion performance, and condensed combustion products (CCPs) have been systematically investigated. The results show that the solid propellants containing AHAPs (SP13) and AHAPs-F (SP14) composites can significantly enhance the reactivity and energy output compared to conventional solid propellants with the mechanical mixture Al/AlH3 (SP12). In particular, the total heat releases of SP13 and SP14 are almost 1.2 and 1.7 times higher than those of conventional ones (SP12, 1442 J g–1), respectively. Among the AlH3-based propellants, SP14 propellants exhibit the highest reaction heat of 5887 J g–1, the most intensive flame radiation of 31.4 × 103, and the highest combustion wave temperature of 2495 °C. Moreover, the particle size distribution of CCPs from SP14 propellants is much narrower and smaller than that of SP12, resulting in higher combustion efficiency.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Jialiang Kang,Xueting Wang,Xiaoxiang He,Cun Lv,Caixia He,Zhanxiong Li
In this study, the perfluoropolyether carboxylic acid (PFPE-COOH) was used to react with polycaprolactone (PCL) to synthesise the hydrophobic block copolymer PCL- b -PFPE. The esterification reaction was performed successfully with the terminated hydroxyl group in the PCL-OH after activation of PFPE-COOH with N, N′ -dicyclohexyl carbon diimide. The PCL- b -PFPE was dissolved in various solvents to prepare microspheres using electrostatic spraying technology, and the flow rate, voltage, temperature and humidity parameters were optimised. The findings demonstrated that the solvent and ambient humidity had a substantial influence on the microspheres' surface morphology . Through smooth surface morphology, chloroform (CF) single solvent formed an ideal microsphere and DMF/CF mixed solvent produced a ‘pit’ surface morphology. Furthermore, the surface roughness of microspheres increases with an increase in humidity. The static contact angles of electrostatic spraying polyester fabric were 147.1° ± 1.8°, 150.9° ± 1.5°, 156.3° ± 2.6° and 155.9° ± 3.3°, under 20 %, 40 %, 60 % and 80 % humidity, respectively. The findings demonstrated that during the electrostatic spraying, the PFPE chain's introduction into PCL helped construct the secondary rough morphology on the microsphere surface and substantially enhanced the hydrophobicity of coatings, providing the finished polyester fabric super-hydrophobicity. The PCL-b-PFPE microspheres were directly sprayed and coated with the developed spray solution via electrostatic spraying. The water contact angle of the finished polyester fabric was found to be ≥140°, which provided hydrophobicity after 5 cycles of laundry. Following the sandpaper abrasion and adhesion tests, the contact angle of the fabrics coated with the microspheres remained ≥145°, indicating a good mechanical stability.
研究领域:
材料科学
·
纺织工程
·
表面化学
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产品关联
DOI
高影响因子
CELLULOSE
·
2023
·Vol. 30
·期 6
·3757-3771
·
IF 5.7
Ge Yue,Lin Ning,Du Chen,Amann Tobias,Feng Hao,Yuan Chengqing,Li Ke
As the thickener for fluorine greases, polytetrafluoroethylene (PTFE) powder performs insufficient load-carrying capacity and limited assistance for friction reduction and wear resistance in the boundary lubrication regime. The present work aims to explore novel nanoparticles with higher mechanical strength as an alternative to PTFE. Cellulose nanocrystals (CNCs) were surface modified by grafting (or partially adsorbing) fluoropolymer chains and introduced into perfluoropolyether PFPE base oil. The obtained polyhexafuorobutyl methacrylate grafted CNC (CNC-g-PHFMA) powder exhibited good compatibility with the PFPE oil. The friction test and wear analysis showed that CNC-g-PHFMA formed a more intensive and stable tribo-film than PTFE on the sliding surface, resulting in more effective friction reduction (11%) and wear resistance (19%). This study demonstrates that fluoropolymer-grafted CNCs have a good application prospect in fluorine greases.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 8
·1936
·
IF 5
Yajun Deng,Changan Zhang,Tao Zhang,Bo Wu,Yanmei Zhang,Jianhua Wu
Waterborne polyurethane are more eco-friendly materials due to lower volatile organic compounds (VOCs, mainly isocyanates) content than the alternative materials. However, these rich hydrophilic groups polymers have not yet reached good mechanical properties, durability and hydrophobicity behaviors. Therefore, hydrophobic waterborne polyurethane has become a research hotspot, attracting significant attention. In this work, firstly, a novel fluorine-containing polyether P(FPO/THF) was synthesized by cationic ring-opening polymerization of 2-(2,2,3,3-tetrafluoro-propoxymethyl)-oxirane (FPO) and tetrahydrofuran (THF). Secondly, fluorinated polymer P(FPO/THF), isophorone diisocyanate (IPDI) and hydroxy-terminated polyhedral oligomeric silsesquioxane (POSS-(OH)8) were used to prepare a new fluorinated waterborne polyurethane (FWPU). Hydroxy-terminated POSS-(OH)8was used as a cross-linking agent, while dimethylolpropionic acid (DMPA) and triethylamine (TEA) were used as a catalyst. Four kinds of waterborne polyurethanes (FWPU0, FWPU1, FWPU3, FWPU5) were obtained by adding different contents of POSS-(OH)8(0%, 1%, 3%, 5%). The structures of the monomers and polymers were verified by1H NMR and FT-IR, and the thermal stabilities of various waterborne polyurethanes were analyzed by thermogravimetric analyzer (TGA) and differential scanning calorimetry (DSC). As the results, the thermal analysis showed that the FWPU performed the good thermal stability and the glass transition temperature could reach at about −50 °C. The FWPU1 film exhibited that the elongation at break was 594.4 ± 3.6% and the tensile strength at break was 13.4 ± 0.7 MPa, elucidating that the FWPU1 film developed the excellent mechanical properties relative to the alternative FWPUs. Further, the FWPU5 film performed the promising properties, including the higher surface roughness of FWPU5 film (8.41 nm) obtained by the atomic force microscope (AFM) analysis, and the higher value of water contact angle (WCA) at 104.3 ± 2.7°. Those results illustrated that the novel POSS-based waterborne polyurethane FWPU containing a fluorine element could develop the excellent hydrophobicity and mechanical properties.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Shuo Wang,Pei Wang,Yunlong Sun,Jiyong Zhao,Zhipeng Wang
The rapid advancement of high-frequency communication networks has imposed more rigorous demands on the overall characteristics of dielectric materials. Poly(aryl ether ketone)s (PAEKs) are good candidate materials for applications in microelectronic devices due to their excellent thermal stability, mechanical properties, and chemical stability. In this work, we endeavored to incorporate large-volume fluorene structures into fluoro-PAEKs, employing strategies to enhance the polymer free volume and reduce polarizations in order to decrease the values of Dk and Df at high frequency. Therefore, a series of poly(ether ketone) (PEK-pOCFBPF-X) copolymers were designed and synthesized through nucleophilic polymerization using 4,4-difluorobenzophenone (DFK), phenolphthalein anilide-containing trifluoromethoxy groups (PPPBP-pOCF3), and a structurally ordered bisphenol fluorene (BPF) as the monomers. The results demonstrate that the introduction of BPF into fluoro-PAEKs resin leads to a low dielectric constant (2.713–2.782@10 GHz) and dielectric loss (0.00597–0.00825@10 GHz), as well as exceptional thermal properties (Tg = 232–240 °C, Td5% = 518–536 °C). Moreover, the copolymer exhibits high mechanical strength (tensile strength ≥ 81 MPa), minimal water absorption (≤0.0063), and excellent solubility. The incorporation of trifluoromethoxy and fluorenyl groups into copolymers significantly enhances the free volume fraction (5.5%–5.8%), resulting in a lower density and reduction in the dielectric constant. Simultaneously, by introducing C–F bonds with lower polarizability, the overall polarizability of the polymer is effectively diminished. These fluoro-PAEKs films, which exhibit superior thermal stability and a low dielectric constant, have great potential for applications in the high-performance flexible electronic packaging field and communication usage.
研究领域:
材料科学
·
电子工程
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产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 18
·3725
·
IF 5
Junhua Chen,Zhihao Zeng,Can Liu,Xuan Wang,Shiting Li,Feihua Ye,Chunsheng Li,Xiaoxiao Guan
Aqueous polyurethane is an environmentally friendly, low-cost, high-performance resin with good abrasion resistance and strong adhesion. Cationic aqueous polyurethane is limited in cathodic electrophoretic coatings due to its complicated preparation process and its poor stability and single performance after emulsification and dispersion. The introduction of perfluoropolyether alcohol (PFPE-OH) and light curing technology can effectively improve the stability of aqueous polyurethane emulsions, and thus enhance the functionality of coating films. In this paper, a new UV-curable fluorinated polyurethane-based cathodic electrophoretic coating was prepared using cationic polyurethane as a precursor, introducing PFPE-OH capping, and grafting hydroxyethyl methacrylate (HEMA). The results showed that the presence of perfluoropolyether alcohol in the structure affected the variation of the moisture content of the paint film after flash evaporation. Based on the emulsion particle size and morphology tests, it can be assumed that the fluorinated cationic polyurethane emulsion is a core–shell structure with hydrophobic ends encapsulated in the polymer and hydrophilic ends on the outer surface. After abrasion testing and baking, the fluorine atoms of the coating were found to increase from 8.89% to 27.34%. The static contact angle of the coating to water was 104.6 ± 3°, and the water droplets rolled off without traces, indicating that the coating is hydrophobic. The coating has excellent thermal stability and tensile properties. The coating also passed the tests of impact resistance, flexibility, adhesion, and resistance to chemical corrosion in extreme environments. This study provides a new idea for the construction of a new and efficient cathodic electrophoretic coating system, and also provides more areas for the promotion of cationic polyurethane to practical applications.Keywords:cationic polyurethane;UV-curable;perfluoropolyether alcohol;cathodic electrodeposition coatings
研究领域:
材料科学
·
化学工程
·
涂层技术
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DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 17
·e53784
·
IF 3
Zhao Li,Xiue Li,Kunxin Wang,Daguang He,Wenjie Diao,Hui Yang,Guoming Yuan Yuan,Yifei Wu,Jun Shi,Kun Wu
Developing materials with a combination of superior properties such as hydrophobicity and low dielectric is very challenging. This work proposes a design strategy based on the synergistic effect of silicon fluorine to fabricate fluorous silicon materials with excellent hydrophobicity and dielectric properties. Perfluoropolyethyl propionate polysiloxane (PEPS) with different grafting ratios was synthesized by the reaction of polymethylhydrosiloxane (PMHS) and perfluoropolyethyl methacrylate (PPM) hydrosilane. The self-crosslinking perfluoropolyether methyl propionate polysiloxane (PFSP) coating with good hydrophobicity and low dielectric was prepared by further introducing triethoxyvinylsilane (TOVS) into the PEPS and condensing. The fluorine content of two interfaces (film PET and film air) of PFSP-4 film was analyzed by XPS, and it was found that the fluorine content of the film air interface was 46.19% and that of the film PET interface was 17.3%. With the increase of perfluoropolyether content in PFSP, fluorine-containing groups migrate to the coating surface, which is more conducive to enhancing the hydrophobicity of the coating. The results indicate that the film has excellent hydrophobicity with a high water contact angle of up to 117° due to the introduction of PPM. In addition, the dipole moment of perfluoropolyether methyl methacrylate is 2.27, which is lower than that of methyl. Therefore, the introduction of a large number of perfluoropolyether bonds effectively reduces the polarity of the material, which is beneficial to its low dielectric properties. The dielectric constant of PFSP-4 is 2.4, which is 33% lower than that of a fluorine-free silicone coating. The results show that the self-crosslinking perfluoropolyether methacrylate polysiloxane coating has excellent hydrophobicity and low dielectric properties, so it has a feasible application prospect in the electronic industry.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Yi Gu,Qiulan Li,Mengjia Yin,Dezhi Yang,Yaling Yang
In this paper, a hydrophobic substrate as concentrators including an inner layer of polytetrafluoroethylene (PTFE) and an outer layer covered a thin layer of perfluoropolyether (PFPE) was constructed to achieve a higher sensitivity for acetamiprid (AC) SERS detection. The condensation effect of the PTFE-PFPE hydrophobic substrate-induced aggregation of gold nanoparticles (Au NPs) result ‘‘hot spots’’ for SERS. The hydrophobic substrate is better reproducibility (RSD < 5%) compared with that on a conventional silicon wafer. A further application of the hydrophobic substrate was demonstrated by the detection of AC in tea samples within a detection range of 0.03 mg/L to 3 mg/L. The hydrophobic substrate eliminates the problem of solution diffusion to avoid the “coffee ring” effect (When a droplet adheres to a solid surface, the suspended molecular particles usually deposit on the edge of the droplet to form a ring).
研究领域:
分析化学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Baoxin Wang,Hongxing Ye,Baiyi Chen,Pengjiao Zu,Guizhen Lu,Li Ma,Haibing Zhang,Mingxian Sun,Yuanjie Li,Hongyi Liu,Jianhua Wu
Bioinspired slippery surfaces have garnered significant attention as promising solutions to mitigate biofouling. Unlike traditional lubricant-infused porous surfaces, recent research has focused on the integration of lubricants within polymer brush-grafted surfaces. The combination of polydimethylsiloxane (PDMS) polymer brush and silicone oil has gradually become the most prevalent choice due to their outstanding chemical affinity. However, this conventional coating system also has the potential for improvement to meet the needs of long-lasting and efficient marine antifouling, including i) precisely designing the polymer brush’s chemical structure to match the polarity of a specific lubricant enhances their chemical affinity, and ii) appropriately reduce the coating system’s surface energy to improve the fouling desorption performance. Here, we introduce a systematically engineered polymer brush/lubricant coating system that incorporates fluorinated polysiloxane and perfluoropolyether fluid. This novel coating system exhibits enhanced adhesion strength coupled with reduced surface energy, resulting in superior stability and omniphobic properties. Additionally, it showcases excellent corrosion resistance and significantly deters marine microorganism adhesion, achieving reductions of 98.8 % for P. tricornutum and 99.8 % for Bacillus sp. . Marine field trials, conducted over a 90-day static immersion period, confirm the remarkable antifouling performance, which surpasses most existing slippery coatings. Moreover, under dynamic conditions, organisms adhering for 150 days are readily dislodged by shear force. These findings underscore the pivotal role of systematic design in polymer brush/lubricant coating systems for the advancement of high-performance slippery surfaces tailored for marine antifouling applications.
研究领域:
材料科学
·
海洋生物学
·
表面工程
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产品关联
DOI
高影响因子
POLYMER
·
2022
·
IF 4.432
Linlin Jin,Junkai Tian,Xin Li,Jiawei Li,Dongming Qi
Water-based protective coatings have gained wide popularity because of their low toxicity and volatile organic compounds (VOCs) emissions. However, improving water barrier performance is a significant challenge. An environmentally friendly short-chain perfluoropolyether carboxylic acid (PFPE-MMA) material has been synthesized in this study, and a series of PFPE-based polyacrylates were prepared using RAFT miniemulsion copolymerization . The impact of PFPE chains and crystalline stearyl methacrylate (SMA) on the wettability of copolymer latex films and their use in protective coatings were studied. Based on the surface and bulk morphology of latex films, the addition of SMA to PFPE-based polyacrylates promoted PFPE chains to migrate toward the air/film interface, leading to exceptional wettability and water resistance through the matrix, resulting in remarkable water barrier properties. After 192 h, the water absorption ratio of 25% PFPE-7% SMA latex film was 3.98%, while that of 25% PFPE latex film was 6.03%. Not only are PFPE-based polyacrylates excellent protective materials with potential applications, but they are also an effective preparation strategy for improving the high barrier property in waterborne protective coatings.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2020
·
IF 3.557
Qibao Dong,Yong Fu,Hu Wang,Ruke Bai,Wei Bai
In comparison with polymers containing long perfluoroalkyl chains (CnF2n+1, n ≥ 8), perfluoropolyalkyl ethers (PFPEs) have been demonstrated to be environmentally friendly polymeric materials. Thus, PFPEs are expected to be alternatives to long perfluoroalkyl chain polymers. However, due to the poor solubility in common organic solvents they are generally prepared and used in fluorinated solvents, which can also cause harmful impacts on the environment. Therefore, it is urgent to explore a strategy for the preparation of high-performance PFPE polymers using environmentally friendly solvents. In this study, three kinds of novel methacrylate macromers bearing PFPE chains with low molar mass were designed and synthesized. The PFPE polymer coatings on polycarbonate plates were obtained by a combinational strategy of spin-coating and in situ photopolymerization of the macromers under UV irradiation. The results indicated that the polymer coatings could be prepared in nonfluorinated solvents, such as 2-propanol. Then the surface properties of the polymer coatings were investigated. It was found that the surface properties of the polymer coatings were related to the structures of the polymers. When CONH-C6H4 as a spacer was incorporated between the backbone and the PFPE chain, the hydrophobicity and oleophobicity of the polymer coatings were significantly enhanced, which is attributed to hydrogen bonds and π–π interaction between the PFPE chains. It is obvious that the synergetic effect of hydrogen bonds and π–π interaction can facilitate the PFPE chains to form a more stable fluorine-rich surface of the polymer coatings. Therefore, synthesis of a high-performance PFPE polymer has been successfully achieved based on PFPEs using an environmentally friendly solvent.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2020
·
IF 4.389
Liang Hong,Jia-Lin Wang,Jun-Xian Geng,Yi-Hua Zhao,Gao-Xin Zhou,Jia Zhang,Li-Wei Liu,Jun-Le Qu
Photodynamic therapy (PDT) has emerged as one of the most promising modalities to treat cancers. However, the hypoxic microenvironment in tumors severely limits the efficiency of PDT. IR780 is a near-infrared light activatable photosensitizer for PDT. It has attracted intensive attention owing to its intriguing properties such as mitochondria-targeting ability and fluorescence imaging capability. Nevertheless, its application in tumor treatment is hampered by its low aqueous solubility and poor stability. To address these obstacles, here we designed a novel hierarchical nanoplatform containing a uniquely stable high loading capacity oxygen carrier (perfluoropolyether, in short, PFPE) and IR780. This nanoplatform (IR780-P/W NE, in abbreviation for IR780-PFPE-in-water nanoemulsion) has no detectable dark cytotoxicity. It not only improves the aqueous solubility and stability of IR780, but also transports oxygen to relieve hypoxia and boosts the efficiency of near-infrared light triggered PDT via augmentation of reactive oxygen species generation. Particularly, the innovative nanosized oxygen carrier developed in this research, P/W NE, is a potential universal platform for loading hydrophobic photosensitizers (including but not limited to IR780), sonosensitizers, or radiosensitizers, and simultaneously improving the therapeutic efficacy. Our results highlight the intriguing potential of the developed nanoemulsions for mitigating tumor hypoxia and enhancing the efficiencies of oxygen-dependent therapies including PDT, sonodynamic therapy, radiotherapy, and so on.
研究领域:
癌症治疗
·
纳米医学
·
药剂学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）