POLYMER BULLETIN
·
2016
·Vol. 74
·期 5
·1817-1830
·
IF 1.371
Jiang Xiancai,Zhang Xi
In this paper, the chitosan/starch (CS/ST) cast films were prepared using AlCl 3 ·6H 2 O aqueous solution as the solvent for CS. AlCl 3 ·6H 2 O was retained in the CS/ST film acting as the plasticizer and glycerol were added to form the complex plasticizer with AlCl 3 ·6H 2 O. The effect of the complex plasticizer of AlCl 3 ·6H 2 O and glycerol on the crystalline, thermal stability, and mechanical properties of CS/ST films was studied by X-ray diffraction, thermal gravity analysis, and tensile testing, respectively. The results showed that AlCl 3 ·6H 2 O aqueous solution was a better solvent for CS than acetic acid aqueous solution which is the most commonly used solvent of CS. With AlCl 3 ·6H 2 O aqueous solution as the solvent, the thermal degradation of CS and ST in the dissolving process was weakened. Glycerol could form the synergism plasticizing effect with AlCl 3 ·6H 2 O. With the complex of AlCl 3 ·6H 2 O and glycerol as the plasticizer, the CS/ST film with the good mechanical properties could be obtained.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2018
·Vol. 87
·期 2
·486-495
·
IF 1.745
Zhang Xiaokang,Zhang Rui,Jin Shuangling,Hu Zhen,Liu Yan,Jin Minglin
Alumina aerogels are prepared from the cheap AlCl 3 ·6H 2 O precursor by the sol-gel method using acetoacetic-grafted polyvinyl alcohol (acac-PVA) as a template and dispersing agent, and propylene oxide as a gelation initiator. The acac-PVA has a high dispersing ability for Al 3+ ion through complexation interaction and increases the content of AlCl 3 ·6H 2 O in sols to as high as 37 wt%, leading to the formation of wet gels without precipitate and crack, and little shrinkage. As-prepared alumina aerogels have high density, high mechanical strength, high mesoporosity, and high-surface area. The shrinkage in supercritical drying processes is greatly reduced. The specific surface area increases and pore size decreases with increasing the content of the acac-PVA in sols. The acac-PVA also acts as a template that provides nucleation sites for boehmite AlOOH particles and inhibits their growth. An excess content of the acac-PVA isolates secondary particles, weakens the interaction between them, and therefore decreases the Young’s modulus. Coarsening is not alleviated obviously after removal of the acac-PVA by high-temperature treatment in air, and the fine primary particles grow into nanorods with diameters of 10–20 nm and lengths of 30–70 nm.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2015
·
IF 4.074
Xiancai Jiang,Yulai Zhao,Linxi Hou
The AlCl 3 ·6H 2 O aqueous solution was used to dissolve chitosan (CS) and the CS/poly(vinyl alcohol) (PVA) blend films were prepared at the absence of acetic acid. AlCl 3 ·6H 2 O was retained in CS/PVA film and glycerol was added to form the complex plasticizer with AlCl 3 ·6H 2 O. The effect of glycerol on the water sorption , crystalline, thermal and mechanical properties of AlCl 3 ·6H 2 O doped CS/PVA film was studied by atomic force microscopy , X-ray diffraction, thermal gravity analysis and tensile testing, respectively. The experimental results showed that glycerol had a significant positive effect on the properties of AlCl 3 ·6H 2 O doped CS/PVA films. With the synergism effect of AlCl 3 ·6H 2 O and glycerol, the prepared CS/PVA films showed excellent mechanical properties. With the addition of 30 wt% glycerol, the AlCl 3 ·6H 2 O doped CS/PVA films behave the tensile strength of 39 MPa and elongation at break of 120%, respectively.
研究领域:
材料科学
·
高分子化学
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DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2013
·
IF 0
Xiuquan Jia,Jiping Ma,Penghua Che,Fang Lu,Hong Miao,Jin Gao,Jie Xu
Direct conversion of fructose-based carbohydrates to 5-ethoxymethylfurfural (EMF) catalyzed by Lewis acid in ethanol was investigated. It was found that BF 3 ·(Et) 2 O was favorable for 5-hydroxymethylfurfural (HMF) etherification to EMF. BF 3 ·(Et) 2 O combination with AlCl 3 ·6H 2 O with the molar ratio of 1 was an effective catalyst system for synthesis of EMF from fructose-based carbohydrates. 55.0%, 45.4% and 23.9% of EMF yields were obtained from fructose, inulin and sucrose under optimized conditions, respectively.
研究领域:
有机化学
·
生物化学
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DOI
CARBOHYDRATE RESEARCH
·
2026
·
IF 3.4
Dongqi Liu,Jun Qian,Xing Chen,Qiaoling Liu,Xiaolei Liu,Xiaoqian Wang,Siyu Zhou,Ying Guan,Liang Zhou,Siquan Xu
A SnCl 4 ·5H 2 O/LVA-DMSO binary system was developed for glucose conversion. • The optimized system achieved 84% HMF yield at 150 °C within 10 min. • DMSO enhanced HMF formation by improving solvation and suppressing side reactions. • Balanced Lewis-Brønsted acidity was crucial for glucose to HMF. A deep eutectic solvent (DES) composed of SnCl 4 ·5H 2 O and levulinic acid (LVA) was developed and combined with dimethyl sulfoxide (DMSO) to construct an efficient reaction medium for the conversion of glucose into 5-hydroxymethylfurfural (HMF). Under the optimized conditions, the Sn/LVA-16-DMSO binary solvent, coupled with AlCl 3 ·6H 2 O as the catalyst, afforded an HMF yield of 84% at 150 °C within 10 min. The effects of key parameters, including solvent composition, DES molar ratio, catalyst dosage, glucose dosage, reaction temperature, and reaction time, were systematically investigated. Response surface methodology (RSM) revealed that reaction temperature and glucose dosage were the most significant linear factors affecting HMF yield within the studied range. The system also showed acceptable recyclability, as HMF could be extracted from the reaction mixture with a recovery efficiency of 86%, and an HMF yield of 52% was retained after five consecutive cycles. FTIR, DSC, TG, and DTG analyses indicated that the Sn/LVA DES formed a strong hydrogen-bonding network and modified the coordination environment of Sn species, while the combination of DMSO and AlCl 3 ·6H 2 O further provided favorable solvation and Lewis-Brønsted acid synergy for glucose conversion. Compared with previously reported DES-based systems, the present homogeneous DES-DMSO strategy combines a high HMF yield of 84% with a short reaction time of only 10 min, demonstrating an efficient approach for the rapid conversion of glucose to HMF. Download: Download high-res image (416KB) Download: Download full-size image
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DOI
高影响因子
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