Silicon
·
2021
·Vol. 14
·期 3
·1159-1167
·
IF 2.67
Pan Zhaoqun,Chen Mianfeng,Zeng Keling,Kang Yingzi
The epoxy-modified silicones have the advantages of both epoxy and organic silicon. In this paper, a series of epoxy-modified methyl phenyl silicone resins were synthesized through the hydrosilylation reaction between 1, 2-epoxy-4-vinylcyclohexane and methyl phenyl silicone resins. The effects of catalyst dosage, reaction time and temperature on the products were further discussed to determine optimal reaction conditions. Then, the as-prepared epoxy-modified silicone resins were cured with methylhexahydrophthalic anhydride. The curing kinetics was investigated through differential scanning calorimetry (DSC). The curing conditions were determined as follows: 1-h curing at 80 °C for and subsequent 1-h curing at 110 °C. The as-prepared products exhibited high light transmittance (~ 90% at 450 nm), strong bonding, suitable hardness and sound waterproof performance. In addition, the introduction of methylphenylsiloxane chain significantly improved the heat resistance and UV resistance of cured products. The epoxy-modified silicone resins are ideal LED packaging materials.
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
POLYMERS & POLYMER COMPOSITES
·
2021
·
IF 2
Hailiang Hu,Minmin Chen,Mengye Cao
The eco-friendly functionalized TiO2/polymer antifouling (AF) coating was successfully synthesized by dispersing TiO2 nanoparticles in waterborne epoxy-modified tung oil resin. The AF effectiveness of coating was evaluated toward Staphylococcus aureus (S. aureus, ATCC6538), Escherichia coli (E. coli, ATCC8739) and diatom (Cyclotella sp., FACHB-1635). The nanoTiO2/polymer AF coating showed good antimicrobial activity both under the light and dark conditions by comparison with the pristine TiO2 nanoparticles and bulk polymer. Under light irradiation for 50 min, the AF coating showed only 8.4% and 8% survival rate for S. aureus and E. coli. In addition, The AF coatings exhibited favorable inhibition efficacy toward the growth and adhesion of Cyclotella sp., and the efficacy was enhanced with the increase of TiO2 content. It can be concluded that TiO2 nanoparticles endow the AF coatings with promoted fouling resistance properties.
研究领域:
材料科学
·
微生物学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Wei Tian,Shuai Wang,Cheng Wang,Haoran Xu,Yunfei Zhao,Huichao Jin,Limei Tian
Erosion and fouling are important factors that affect the performance of power components of large cargo ships. Inspired by animal cartilage tissue, an epoxy modified polyurethane composite coating (FD-EPU) with reproducible self-healing properties was successfully prepared. FD-EPU was endowed with excellent resistance to cavitation, corrosion, and fouling due to the presence of functional reduced graphene oxide (FrGO) and 2-octyl-4,5-dichloroisothiazolinone (DCOIT). The introduction of FrGO with multiple hydrogen bonds into coatings increased the tensile strength of FD-EPU by 3.56 MPa and exhibited excellent cavitation resistance (with a mass loss of 4.7 mg under continuous cavitation for 60 h). In addition, the barrier effect of FrGO enabled FD-EPU to possess outstanding anticorrosion ability. After being immersed in 3.5 wt% NaCl for a duration of 15 days, the |Z |0.01Hz value of FD-EPU was found to remain at 9.18 × 10 9 Ω·cm 2 . The modification of epoxy resulted in FD-EPU coatings with improved adhesion by 53.5 % compared to non-modified coatings, with a bond strength of 23.8 MPa on stainless steel. The incorporation of DCOIT and FrGO endowed FD-EPU with good antifouling properties (removal of more than 97.5 % of bacteria and removal rate of microalgae up to 96.2 %). Furthermore, FD-EPU exhibited outstanding opto-thermal self-healing capability, with a self-healing efficiency of 61 % after 30 s of near-infrared light irradiation. This work provides a new inspiration for the protection of large cargo ship power components.
研究领域:
材料科学
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海洋工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Liyan Tao,Qianxin Zhang,Tong Li,Shubo Deng
Aminated adsorbents are efficient for CO 2 capture from indoor air, but mild-temperature regeneration is challenging. In this study, the epoxide-modified pentaethylenehexamine (PEHA) was loaded in the modified activated carbon fiber felt (ACF), and the formed hydroxyl groups after the reaction of 1,2-epoxybutane (EB) with PEHA made the adsorbent stable and efficient for CO 2 adsorption and desorption. The optimized adsorbent, denoted as EB-PEHA-ACF, had the CO 2 adsorbed amount of 60 mg/g in the simulated indoor air with 1000 ppm CO 2 and 50% relative humidity. The adsorbent exhibited fast desorption kinetics, and nearly 100% of adsorbed CO 2 could be desorbed within 25 min even at 60 ℃. Especially, this spent EB-PEHA-ACF could be successfully regenerated at 50 ℃, and the adsorbent showed almost stable adsorption capacity in ten adsorption and regeneration cycles. Fourier Transform Infrared (FTIR) analysis showed that the functional group peaks of EB-PEHA-ACF were unchanged before and after the ten CO 2 adsorption-desorption cycles.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2022
·Vol. 223
·期 20
·2200194
·
IF 2.996
Zhixi Dai,Juan Li,Shaowen Huang,Bo Li,Xiaoyu Zou,Liangxi Wu,Min He
Pyrophyllite (Prl), an aluminosilicate with a balanced mineral structure and extremely small particle size, appears to be an ideal filler but is rarely used in polymers. Herein, a method for the application of pyrophyllite in polymers is reported. A multifunctional filler is prepared by epoxy-modified pyrophyllite and incorporated into poly(latic acid) (PLA) to enhance its processability and crystallization properties. Results show the effectiveness of epoxy-modified Prl in composite film with a significant reduction in glass transition temperature, and noteworthy increment in crystallinity and spherulite growth rate. Water vapor barrier properties of PLA composite films increase over 30% with a range of Prl Loading. Furthermore, an enhancement of the tensile strength is increased by 30% and strain at break by 337.1% for PLA composite films compared to neat PLA. This work provides a new idea to prepare the functionalized pyrophyllite fillers and a theoretical basis to develop the application of pyrophyllite for polymers.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2019
·
IF 3.621
Xun Sun,Rongrong Chen,Xiang Gao,Qi Liu,Jingyuan Liu,Hongsen Zhang,Jing Yu,Peili Liu,Kazunobu Takahashi,Jun Wang
Marine biofouling is a catastrophic problem for maritime industries, which catches researchers’ attention. Antifouling coatings have been proved to be an effective approach to against fouling organisms. Herein, we firstly synthesized polydimethylsiloxane with aminopropyl-terminated pendant groups (APDMS) through a ring opening polycondensation, and then APDMS was reacted with bisphenol A type epoxy resin (DGEBA) to form the epoxy modified polysiloxane-based resin (EAPDMS). The curing behavior of DGEBA/APDMS was studied by differential scanning calorimetry (DSC) with a non-isothermal curing method. The adhesion strength of EAPDMS was remarkably improved. The results of dynamic mechanical properties (DMA) and tensile tests showed an obvious enhancement of mechanical properties in the modified resin system. Marine field tests revealed that coatings exhibited excellent antifouling performance within 3 months. In brief, the EAPDMS coatings possess outstanding mechanical properties and excellent adhesion strength, showing high potential in the marine antifouling field.
研究领域:
材料科学
·
海洋科学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 39
·e54462
·
IF 3
Jia Liu,Zhengchun Cai,Yongxin Ji
The synthesis of bio-based modified amphoteric epoxy modified acrylate sizing emulsion based on reversible addition fragmentation chain transfer (RAFT) polymerization and its application in paper sizing were studied. A macromolecular chain transfer agent for RAFT polymerization was synthesized by the esterification of epoxy resin E-51 with RAFT agent to eliminate the active groups on RAFT agent. Amphoteric polymer emulsifiers with good emulsification and dispersion effects in acidic and alkaline media were successfully prepared by RAFT polymerization. After neutralization, other monomers were polymerized to access cationic sizing emulsion (acid neutralization) and anionic sizing emulsion (alkali neutralization). The effects of bio-based monomer content, hydrophilic monomer dimethylaminoethyl methacrylate (DM) content and degree of quaternization on the properties of sizing emulsion and sizing paper were further explored. In addition to the particle size and polymer dispersion index (PDI) of latex particles in different experimental groups, the water resistance, folding resistance, bursting strength, tensile strength and surface roughness of sized paper were analyzed and evaluated. Based on these results, a better sizing emulsion formulation was established. It was confirmed that the addition of bio-based monomers can improve the sizing performance of paper.
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
Materials Today Communications
·
2025
·
IF 4.5
Qiuxue Zhang,Yunjiao Deng,Zhongyu Fu,Shuangquan Wang,Chao Zhou,Huixuan Zhang
Oil agent was a kind of auxiliary agent which played an important role in the processing of carbon fiber. High hydrophilia and low surface tension of polyether-epoxy modified polymethylphenylsiloxane (PEMPS) emulsions used as oil agent had been designed and prepared. Firstly, polyether modified methyldimethoxysilane (PMMS) was synthesized with methoxypolyethylene glycols (MPEG) and (3-isocyanatopropyl)dimethoxymethyl-silane (IPDS). PEMPS were synthesized by introducing PMMS into epoxy modified polymethylphenylsiloxane. With the PMMS content increasing from 0 % to 7 %, the water contact angle of PEMPS decreased from 79.0° to 32.4°. PEMPS emulsions were prepared with PEMPS, surfactants and water. Compared with PEMPS without PMMS, and the hydrodynamic size of PEMPS emulsion containing 7 % PMMS decreased from 310.3 to 159.3 nm, and the surface tension reduced from 22.9 to 20.6 mN/m. In addition, as the interaction between PEMPS and PAN was enhanced, the PEMPS emulsion contact angle on polyacrylonitrile (PAN) film also decreased from 36.2° to 27.8°, indicating that PEMPS emulsions had excellent hydrophilia and proper hydrodynamic size and could be used as PAN spinning oil when the PMMS was 7 %. The surface of PAN precursors coated by diluted PEMPS emulsions was flat, and a significant decrease in heat releasing of precursors during heat treatment could be observed. However, as the solid content was 3 wt%, many agglomerations appeared on the surface of the precursor. Taken together, 1 wt% PEMPS emulsion could repair the grooves on PAN precursors surface and benefit for the spinning process of PAN precursors.
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
Silicon
·
2024
·
IF 2.8
Zhang Qiuxue,Deng Yunjiao,Fu Zhongyu,Wang Shuangquan,Li Songsong,Zhou Chao,Zhang Huixuan
A series of epoxy modified polymethylpenylsiloxane (EPMPS) emulsions for oil agent in carbon fibers production were synthesized with EPMPS resins and non-ionic emulsifier by phase inversion emulsification. The EPMPS resins with different epoxy content were prepared by non-hydrolytic sol–gel method. The influence of epoxy content on the chemical structure, molecular weight, surface tension and thermal stability of EPMPS resins were investigated by Fourier transform infrared (FTIR), gel permeation chromatography (GPC), contact angle meter and thermogravimetric analysis (TGA), respectively. The properties of EPMPS emulsions and their effects on polyacrylonitrile (PAN) precursor were investigated by scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). It was found that the increase of epoxy content not only obviously decreased the molecular weight and surface tension of EPMPS, but also conduced to the processing of PAN precursor. With the decreasing of surface tension, the oil agent was easier to spread and film on the surface of PAN precursors. In addition, the TGA curves showed that the EPMPS resins had good thermal stability at low temperature and can be completed volatilized under high temperature conditions. Hence, the EPMPS emulsions could be used as oil agent for PAN precursors.
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
JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
·
2016
·
IF 0.901
Jiao Pan,Min Li,Shaokai Wang,Yizhuo Gu,Qingwen Li,Zuoguang Zhang
This paper successfully interlaced floating catalyst chemical vapor deposition-grown carbon nanotube film and ultrathin carbon fiber prepreg to achieve strong and flexible carbon nanotube/carbon fiber hybrid composites with high carbon nanotube loading. Epoxidation was also introduced to improve interlaminar interfacial bonding. It was found that pristine carbon nanotube film/carbon fiber interply hybrid composite (carbon fiber/carbon nanotube/carbon fiber) showed sudden and brittle failure, while epoxidation caused a gradual failure behavior. Hybrid effect analysis suggested that the improved tensile performance and synergistic effect of epoxidized carbon nanotube film/carbon fiber hybrid composite were attributed to good load transfer and suppressed delamination induced by improved interfacial bonding. In addition carbon fiber/carbon nanotube/carbon fiber manifested excellent damping capacity with the maximum loss factor of 0.13. The in-plane electrical conductivity of composite with global carbon nanotube content of 21 wt% increased to the same order of magnitude as carbon nanotube film composite. The excellent mechanical, damping, and electrical properties demonstrated great potential for both structural and multifunctional applications of the resultant hybrid composites.
研究领域:
材料科学
·
复合材料工程
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2019
·
IF 3.42
Yufeng Han,Jixiao Wang,Zhi Wang,Song Zhao
High performance protective coatings applied under heavy duty condition will lengthen the structure’s service life, decrease maintenance times, economic and human life loss. Here, high protective performance coatings were prepared by dispersing polyaniline (PANI) nanowires into epoxy modified furfural-acetone (EMFA) resin matrix and then cured with phenalkamine. The protective performance of coatings was investigated by immersion experiments in 12% NaCl solution at 90 °C and Electrochemical Impedance Spectroscopy (EIS) measurements. The coating containing 1.0% PANI nanowires showed high impedance (>10 10 ohm·cm 2 ) after 80 days immersion, exhibiting great protective performance. X-ray photoelectron spectroscopy (XPS) surveys verified the formation of passive layer (Fe 2 O 3 /Fe 3 O 4 ) on steel surface beneath the coating with 1.0% PANI. The bending test suggested that both the pure EMFA coating and the EMFA/PANI coating showed excellent flexibility of 2 mm. Here, measurement of water absorption, adhesion strength, pencil hardness and impact resistance were conducted to evaluate coatings performance.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Yabo Chen,Jihu Wang,Shaoguo Wen,Jijia Zhang,Xiangyi Yu,Yan Mao
Rose-like sheet zinc phosphate (SZP) was prepared by the induction-calcination method using emulsified paraffin emulsion. The structure of SZP prepared under different conditions was characterized by X-ray photoelectron spectroscopy, X-ray diffractometer, Fourier transform infrared spectroscopy, and Scanning electron microscope. It was added as an anti-corrosive filler to waterborne epoxy-modified acrylic resin. The failure behavior of the coating film was studied by salt spray test and electrochemical workstation. Compared with pure resin, the best neutral salt spray resistance time increased from 24 hours to 336 hours, about 14 times. Besides, the contact angle of the film was measured with a contact angle meter. The results show that SZP can increase the contact angle of the film, improve the water-resistance of the epoxy-modified acrylic resin coating, and prolong the diffusion path of the corrosive medium to the substrate. Therefore, the rose-like sheet zinc phosphate enhances the barrier performance of the coating and can be used as an excellent corrosion inhibitor.
研究领域:
材料科学
·
腐蚀与防护
·
表面工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）