Journal of Inorganic and Organometallic Polymers and Materials
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2024
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IF 3.9
Li Chaoqun,Zhao Xiaojia,Wang Qi,Chen Shunzhong,Yin Fangqian,Lan Jianru,Qi Ruiyue,Peng Guirong
Polymer-based composites with excellent dielectric properties are vital component in the electronics and power systems. In order to improve dielectric constant and reduce loss of polymer, a series of flexible PVDF-based composite films containing functionalized graphene were prepared in this work. The results of TEM, FTIR, TG, and XPS showed that Methyltetrahydrophthalic Anhydride (MeTHPA) was successfully grafted onto the surface of graphene nanosheets. SEM indicated that grafted graphene nanosheets are uniformly dispersed in PVDF. Brunauer Emmett Teller (BET) analysis suggested that MGNP-PVDF composite film with a dense structure was fabricated. Compared with the PVDF-based composite film with un-grafted GNP, the introduction of MeTHPA-GNP remarkably enhanced the dielectric properties and restricted the dielectric loss and conductivity of the MGNP-PVDF composite films. When content of MeTHPA-GNP filler was 3.5%, the dielectric constant of the composite film reached 62 under 1 kHz at room temperature, and the dielectric loss maintained a low value of 0.425. The above-mentioned outstanding properties are owing to the compatibility of the ester groups in the grafted graphene nanosheets and the ester groups in the epoxy resin. This is caused by the effective encapsulation of MeTHPA molecules grafted on the surface of graphene nanosheets.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
POLYMER INTERNATIONAL
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2018
·Vol. 68
·期 4
·724-734
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IF 2.352
Yang Liu,Zheng-zhou Liu,Wei-feng Peng,Zheng Lu,Jiang-huai Hu,Ke Zeng,Gang Yang
Two novel tetrahydrophthalic anhydride end-capped imide compounds (THAN and THBN) with high thermal stability were synthesized to promote the curing reaction of 1,3-bis(3,4-dicyanophenoxy)benzene (3BOCN), and to study the effects of comonomer structure on the curing behavior and thermal performance of phthalonitrile resins. The curing behaviors of THAN/3BOCN and THBN/3BOCN blends with various molar ratios were investigated using rheological analysis and differential scanning calorimetry, suggesting a wide processing window. Dynamic mechanical analysis and thermogravimetric analysis showed that the cured resins possessed high glass transition temperatures (> 500 °C), and superior thermal and long-term thermo-oxidative stabilities with weight retention of 95% ranging from about 544 to 558 °C in both nitrogen and air. All these results indicated that the processability and thermal properties of phthalonitrile resins could be improved further by modifying the structure of comonomer in this kind of curing system. © 2018 Society of Chemical Industry
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
ChemSusChem
·
2021
·Vol. 14
·期 9
·2067-2075
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IF 8.928
Sen Jiang,Haihua Wu,Junying Yin,Zhihua Wei,Jiahao Wu,Lai Wei,Dunfeng Gao,Xin Xu,Yunfang Gao
Graphical Enhanced electrolyte : Ultralow-cost benzoic anhydride (BA), as a promising bifunctional electrolyte additive to capture hydrogen fluoride and H 2 O as well as to construct a robust cathode-electrolyte interface on the LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) cathode surface, effectively improves the cycling performance and rate capability of high-voltage Li-ion batteries with LiPF 6 -based electrolyte. High-voltage LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811)-based Li-ion batteries (LIBs) with enhanced performance can be achieved by properly tailoring the electrolyte systems. Benzoic anhydride (BA) was proposed here as a promising bifunctional electrolyte additive that can not only construct a robust cathode-electrolyte interface (CEI) film on the electrode surface but also capture HF/H 2 O in the electrolyte effectively. Compared to the cell without the BA additive, the capacity of Li/NCM811 half-cell with 1.0 wt % BA was increased from 128.5 to 149.6 mAh g −1 after 200 cycles at 1 C between 3.0 and 4.3 V. Even at a higher cut-off voltage of 4.5 V, the BA-containing Li/NCM811 half-cell delivered a capacity retention of 69 % after 200 cycles, much higher than that of the half-cell without the additive (56 %). Both theoretical calculation and experimental results verified that the BA additive could be preferentially oxidized to form a stable interface film with high conductivity that protected the NCM811 cathode and suppressed the decomposition of the electrolyte.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
POLYMER
·
2022
·
IF 4.432
Chao Cheng,Chenyu Zhang,Zhengguo Chen,Fei Zhou,Zeyu Sun,Muhuo Yu
In this work, the tackified PDCPD (PDCPD-T) specialized for vacuum assistant resin infusion process (VARI) was developed. The epoxy resin and methyl nadic anhydride (NMA) was subsequently added to the PDCPD-T to improve the interfacial bonding with the carbon fibres. The results showed that the introduction of NMA-cured epoxy undermined the mechanical properties of the PDCPD-T owing to the agglomeration of the tackifier particles. Nonetheless, the mechanical properties of the CFRCs based on the co-cured blends of the PDCPD-T and the NMA-cured epoxy were comprehensively improved compared to the composites based on the PDCPD-T. The improvement was that a part of NMA-cured epoxy in the co-cured blends would phase separate on the surface of the carbon fibre, which formed the “bridge” connecting the matrix and the carbon fibre. In addition, the degree of the tackifier agglomeration would also decrease due to the decrease in the surrounding epoxy concentration.
研究领域:
材料科学
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复合材料工程
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DOI
高影响因子
Journal of Cleaner Production
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2021
·
IF 9.297
Ning Zhang,Xianglin Hou,Xiaojing Cui,Lin Chai,Hongyan Li,Hui Zhang,Yingxiong Wang,Tiansheng Deng
Plastic waste is increasingly aggravating environmental pollution problems. Unsaturated polyester resin is one kind of thermoset resins . Its three-dimensional network endows it good mechanical and chemical properties, but made its degradation and recovery challenging. Here we report a novel and efficient reaction system consisting of amphiphilic p-toluenesulfonic acid/acetic acid aqueous solution for decomposition of unsaturated polyester resin by acyl exchange reaction. Amphiphilic p-toluenesulfonic acid facilitated the entrance of itself and solvent into the resin and consequently promoted catalytic cleavage of ester bonds in unsaturated polyester resin. Water, as a co-catalyst, stabilized the key reaction intermediate species, which reduced largely the overall reaction activation energy and thus accelerated the degradation of the resins. Unsaturated polyester resin was completely degraded and converted to the valuable chemicals at 180 °C, which can be then recycled by a new separation process. The degradation products were mainly ethylene glycol diacetate, phthalic acid, and copolymer products of styrene and maleic anhydride, with the mass ratio of 43.18%, 24.81% and 44.16% to raw unsaturated polyester resin waste, respectively. The atoms of unsaturated polyester resin were completely incorporated into the high-value degradation products with zero production of waste. Hence, this work provides a green, economical, practical strategy to degrade waste unsaturated polyester resin and recycle high-value chemicals with an 100% atom utilization efficiency.
研究领域:
环境科学
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化学工程
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材料科学
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可持续化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）