MACROMOLECULAR MATERIALS AND ENGINEERING
·
2020
·Vol. 305
·期 6
·2000063
·
IF 3.853
Yang Mo,Lijun Yang,Wei Hou,Tiantian Zou,Youyu Huang,Ruijin Liao
This study aims to decrease the dielectric constant of kraft paper by 1,2,3,4-butanetetracarboxylic acid (BTCA) esterification crosslinking. Kraft paper samples are treated with various concentrations of BTCA to prepare modified paper with different reaction degrees. Morphology and surface chemical composition are characterized. The dielectric constant and loss of the plain and modified paper are also investigated. Results show that esterification occurs successfully between cellulose molecular chain and BTCA. The intrinsic dielectric constant and loss of 6 g L −1 BTCA-treated paper decrease by 23.5% and 36.3%, respectively, at 50 Hz. The esterification can reduce the hydroxyl amounts on cellulose. The formed crosslinking network between the cellulose chains restricts the cellulose orientation polarization, thereby reducing cellulose polarizability. The electrical strength, mechanical properties, and thermal behavior of the samples are explored to evaluate comprehensively the modifying effect. BTCA esterification crosslinking proves to be a promising method for decreasing the dielectric constant of kraft paper.
研究领域:
材料科学
·
电气工程
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 141
·期 10
·e55050
·
IF 3
Yang Mo,Gang Hu,Yuanyuan Gao,Mao Zhang,Ruijin Liao
This study investigates the effect of 1,2,3,4-butane tetracarboxylic acid (BTCA) crosslinking treatment on the electrical properties of poly-p-phenylene terephthalate (PPTA)/cellulose insulation paper to prepare a novel composite insulation paper with low dielectric constant and good electrical performance. Three-layer PPTA/cellulose composite paper crosslinked by BTCA under various conditions, composite paper without crosslinking, directly mixed composite paper, and conventional Kraft paper are prepared. The morphology and surface chemical composition of the paper samples are characterized. Dielectric, mechanical, and thermal properties are investigated. Results show that the BTCA concentration of 0.2 mol L −1 with a 180°C curing temperature is the relatively superior crosslinking condition to prepare a novel composite with low dielectric constant and good comprehensive performance. The dielectric constant and loss of the novel composite paper decrease to 3.21 and 0.392 at 50 Hz. The tensile strength of the BTCA crosslinked three-layer PPTA/cellulose composite paper (thickness: 130 μm) has reached 10.01 kN m −1 , increased by 41.6% than the directly mixed composite paper. The novel BTCA crosslinked composite paper also shows improved thermal stability. The BTCA crosslinking proves to be a promising method to improve the dielectric properties and electrical performance of the PPTA/cellulose composite paper.
研究领域:
材料科学
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电气工程
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 42
·e53031
·
IF 3.057
Shuxian Yu,Changjun Zhao,Jie Wei,Shuai Jia,Pan Chen,Ziqiang Shao,Shaoyi Lyu
In this study, cross-linked cellulose nanocrystals (CNC) were esterified using 1,2,3,4-tricarboxylic acid (BTCA) to decrease the hydroxyl content of the nanocellulose, control its hydrophilic/hydrophobic degree, and improve its compatibility with the polypropylene (PP) matrix. The mechanical and physical properties of nanocellulose-reinforced polypropylene composites were investigated after they were manufactured via melt extrusion using a twin-screw extruder. FTIR and XPS analysis revealed that the nanocellulose chain was successfully esterified utilizing BTCA. The results from SEM and Mapping demonstrated that the nanocellulose was spread equally throughout the matrix. By characterizing the 5 wt% CNC/PP composite material with DMA and tensile testing devices, the elongation at break decreases, the rigidity increases, and the tensile strength increases to 50.5 MPa, a 25.5% increase over pure polypropylene. Simultaneously, DSC data demonstrated that nanocellulose provided a heterogeneous nucleation site, expedited polypropylene crystallization, and was advantageous for polypropylene processing. According to the results of TG/DTG, esterified CNC/PP composites containing 5% CNC had the highest thermal resistance, with T onset and T max increasing by up to 66 and 11.6°C, respectively, when compared to pure PP. Following a thorough investigation and evaluation of the samples' mechanical and thermal properties, it was determined that BTCA esterification cross-linking is an effective method for surface modification of nanocellulose, as it increases the compatibility of nanocellulose with polypropylene, improves the mechanical properties of polypropylene, and thus expands its application range.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 7
·1-8
·
IF 5.479
Cao Yu,Wang Luona,Wang Chengyin,Su Dawei,Liu Yunling,Hu Xiaoya
A photoelectrochemical (PEC) sensor was constructed for the detection of non-electroactive malathion. It is based on the use of a hierarchical CuO material derived from a Cu-BTC metal-organic framework (where BTC stands for benzene-1,3,5-tricarboxylic acid). The modified CuO was obtained by calcination of Cu-BTC at a high temperature (300 °C) and possesses a high photocurrent conversion efficiency. Under irradiation with visible light and in the presence of malathion, the formation of the CuO-malathion complex on the CuO gave rise to an increase in steric hindrance. This results in a decrease in photocurrent. This novel PEC detection method has a lower detection limit of 8.6 × 10 −11 mol L −1 and a wide linear range (1.0 × 10 −10 ~ 1.0 × 10 −5 mol L −1 ).
Schematic presentation of the Cu-BTC MOF derived photoelectrochemical sensor for non-electroactive malathion detection.
研究领域:
分析化学
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环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Chenxi Zhang,Chao Zhang,Zhiming Jiang,Ping Zhu
To decrease strength loss of flame-retardant cotton fabric using polycarboxylic acid as the crosslinker, a series of multi-amino phosphoramide (BPEI/DPn) was synthesized using branched polyethyleneimine (BPEI) and dimethyl phosphite (DP). The flame retardant coating was fabricated on cotton fabric with the assist of 1,2,3,4-butanetetracarboxylic acid (BTCA). The optimum multi-amino phosphoramide was obtained by investigate the effect of different BPEI/DPn on washing durability and flame retardancy of modified cotton fabrics. The results found that BPEI/DP4 (mole ratio of BPEI and DP was 1:4) coated cotton fabric presented superior flame retardancy with self-extinguishing action and 27.9% of LOI value. Also, this flame-retardant cotton fabric can withstand a certain number of standard washing cycles. The heat and smoke release of cotton fabric during the combustion were significantly inhibited after modification with BPEI/DP4, and HRR value decreased by 35.0% compared with the unmodified cotton. Additionally, BPEI/DP4 can greatly improve the mechanical capability of cotton fabric modified with BTCA, and almost 80% of breaking force can be remained owning to partially neutralizing the acidic circumstance of BTCA solution, which might provide an efficient method to prepare functional cotton fabric with high performance.
研究领域:
纺织科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
CELLULOSE
·
2023
·Vol. 30
·期 11
·7373-7388
·
IF 5.7
Zhang Hao,He Shiqi,Hu Yanli,Li Fengyan,Zhou Baoming
In this study, a chitosan-based high polymer antibacterial agent CS-g-DMC with high water solubility was synthesized via an environmentally friendly initiator system of H 2 O 2 and ascorbic acid (Vc). The CS-g-DMC is used for the long-effective antibacterial finishing of cotton fabric. SEM, EDS, FTIR, XPS, and XRD were conducted to characterize the finished fabric. After the treatment, the CS-g-DMC were cross-linked with cellulose by 1,2,3,4-Butane tetracarboxylic acid BTCA thus immobilized on cotton fabrics. Results showed CS-g-DMC had linked with cellulose by stable chemical bond and uniformly distributed on the surface of cotton fiber. The antibacterial test shows that after treatment, the inhibition rates of the cotton fabric against E. coli and S. aureus are above 99.9%. Moreover, the inhibition rates of the two bacteria reach 94.3% and 95.3% after washing ten times, respectively. The finished cotton fabric had significantly improved hydrophily; its contact angle decreased from 107° to 104°. Its breaking force significantly increased from 173.38 to 219.33 N, while its breaking elongation and moisture transmission rate had no significant decrease. In general, CS-g-DMC-finished cotton fabrics achieve long-lasting antibacterial properties and higher mechanical properties while retaining a high degree of wearing comfort.
研究领域:
材料科学
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高分子科学
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纺织工程
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抗菌技术
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表面化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）