JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 12
·51827
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IF 3.125
Yuan Li,Lu Zhang,Fayong Li,Ke Wang,Xiaoru Wu,Hailu Liu,Bibo Long,Yang Zhao,Dong Xie,Junjia Chen
The hydrophobic modification of cellulose nanofibers (CNF) was carried out via free radical polymerization using methyl methacrylate (MMA) as the monomer to improve the compatibility between CNF and poly lactic acid (PLA). Followed by the preparation of the novel nanocomposites in combination of the organic montmorillonite and the substrate. The resulting nanocomposites were then coated on paper surface using a cast-coating process in an attempt to improve the barrier properties towards water vapor and oxygen. In addition, the composite films are prepared via a solution casting method. The water vapor transmission rate (WVTR), water vapor permeability (WVP), oxygen transmission rate (OTR), and tensile strength of the as-prepared films were systematically measured. The corresponding results demonstrated that the WVTR, WVP and OTR decreased with the addition of a certain content of MCNF in coatings. 0.2 wt% MCNF is the optimum content, showing the best gas resistance and tensile performance. The lowest value of WVTR and WVP are 10.30 g/(m 2 ⋯24 h) and 3306.58 g⋯μm/(m 2 ⋯24 h) for films with 0.2 wt% MCNF added, which is 88.23% and 26.05% lower than that of PLA composite film without NFC.
研究领域:
高分子材料
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纳米复合材料
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包装材料
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表面涂层
·
生物基材料
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 15
·期 7
·6478-6487
·
IF 1.5
Fan Qin,Li Jiang,Pengming Long,Shuting Xu,Yujia Ling,Yundan Yu,Guoying Wei
The silanization of metal surface is a new and environmental anti-corrosion technology. SiO 2 film has been prepared on copper by an electrochemically-assisted deposition technology using tetraethoxysilane as a silane reagent in this research. The effect of deposition potential on structure and performance of SiO 2 film were also studied. The results indicate that SiO 2 is the main component of the deposited films. As the deposition potential changes from -1.0V to -1.5V, the value of SiO 2 content, film deposition rate and film thickness all increase first and then decrease. When the deposition potential is -1.4V, the deposition rate of SiO 2 film is the fastest (1.13×10 -5 g·cm -2 ·s -1 ) and this film is also the thickest (69.1 μm). Moreover, the prepared SiO 2 film has obvious barrier property and can improve the corrosion resistance of the Cu substrate.
研究领域:
材料科学
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腐蚀工程
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电化学
·
表面涂层
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 12
·期 4
·2679-2691
·
IF 1.5
Fuyou Lu,Baodong Song,Jixiao Wang
Acrylic polyurethane and polyaniline (APU/PANI) nanocomposite coatings with excellent protective performance were prepared with physical blending method. Then, the effect of PANI nanowire on the coating’s protective and mechanical properties was investigated. The protective performance of APU/PANI nanocomposite coatings was characterized by electrochemical impedance spectroscopy (EIS) technology. After immersion for 58 days in 3.5 wt % NaCl solution at 35 o C, the EIS results interestingly demonstrated that the original coating has the unexpected highest impedance value at about 1.57×10 10 ohms·cm 2 in all specimens. However, with the increase of PANI nanowire contents, the APU/PANI nanocomposite coating’s impedance decreased dramatically and spot corrosion occurred gradually. That is to say, PANI nanowire has the negative effect on the protection performance of the APU nanocomposite coatings system. In addition, the results also indicated that, with increase of PANI nanowire, the APU nanocomposite coating’s mechanical behavior deteriorated dramatically and water resistance decreased slightly. These experimental results will provide some helpful insights on study of PANI nanowire modified other coating systems or protective mechanism of PANI.
研究领域:
材料科学
·
腐蚀工程
·
聚合物纳米复合材料
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表面涂层
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2019
·
IF 0
Jiahui Zhou,Yilin Yang,Rui Qin,Min Xu,Yeming Sheng,Xun Lu
Simultaneous optimization of the mechanical strength and self-healing cycles of polymers at ambient temperature has long been considered a great challenge because it is difficult to strike a balance between intermolecular interactions and segment/chain mobility. Here, we synthesized a unique class of amide-based polyurethanes incorporated with an unreported low-cost carboxylic-acid-type aromatic disulfide, which exhibits an amazing integration of mechanical robustness and fast self-healing ability, and a ready healing efficiency of 98% can be achieved when healed for only 30 s at ambient temperature, as calculated using Young’s modulus (pristine: 59.4 MPa). As a result of hierarchical structure tuning, the target poly(urethane-amide) exhibits relatively fast segment movements but slow chain diffusion dynamics, thus facilitating rapid recombination of H-bonding as well as disulfide metathesis between fractured surfaces with a small degree of both microphase separation and crystallization. This easily processable poly(urethane-amide) has the potential to be widely used in various industries as a high value-added film.
研究领域:
材料科学
·
高分子化学
·
自修复材料
·
表面涂层
·
先进功能高分子
✓ 已验证
DOI
危险品化学品经营许可证（带存储）