JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 23
·46351
·
IF 1.901
Li Wen,Liwen Wang,Shuyi Fang,Lei Bao,Dongdong Hu,Yuan Zong,Ling Zhao,Tao Liu
Two newly-designed hydrocarbon surfactants, that is, poly(vinyl acetate)- block -poly(1-vinyl-2-pyrrolidone) (PVAc- b -PVP) and PVP- b -PVAc- b -PVP, were synthesized using reversible addition–fragmentation chain transfer polymerization and used to form CO 2 /water (C/W) emulsions with high internal phase volume and good stability against flocculation and coalescence up to 60 h. Their structures were precisely determined by nuclear magnetic resonance, gel permeation chromatography, thermal gravimetric analysis, and differential scanning calorimetry. Besides low temperature and high CO 2 pressure, the surfactant structures were the key factors affecting the formation and stability of high internal phase C/W emulsions, including the polymerization degrees of CO 2 -philic block (PVAc) and hydrophilic block (PVP), as well as the number of hydrophilic tail. The surface tension of the surfactant aqueous solution and the apparent viscosity of the C/W emulsions were also measured to characterize the surfactants efficiency and effectiveness. The surfactants with double hydrophilic tails showed stronger emulsifying ability than those with single hydrophilic tail. The great enhancement of the emulsions stability was due to decrease of the interface tension as well as increase of the steric hindrance in the water lamellae, preventing a frequent collision of CO 2 droplets and their fast coalescence. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46351.
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
POLYMER
·
2015
·
IF 3.562
Wei Luo,Shoucun Zhang,Peng Li,Ran Xu,Yuexuan Zhang,Liyun Liang,Colin D. Wood,Qunwei Lu,Bien Tan
For tissue engineering, pore structure is an essential element in the development of scaffolds. In this paper, we obtained highly porous cross-linked partially hydrolyzed poly (vinyl alcohol) (PVA) hydrogels by templating concentrated CO 2 -in-water (C/W) emulsions, which avoid the use of traditional organic solvents and additional surfactants . This method is very convenient for the formation of biocompatible PVA hydrogels, because redundant crosslinking agent and catalyst could be easily removed by washing with the absence of organic solvent and surfactants, and would have widespread applications due to the biocompatibility of the resulting materials. These PVA hydrogels were further evaluated for cellular growth and proliferation to demonstrate their applications in tissue engineering.
研究领域:
材料科学
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生物医学工程
·
组织工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 112
·92017-92024
·
IF 3.84
Wei Luo,Ran Xu,Yunfei Liu,Irshad Hussain,Qunwei Lu,Bien Tan
The key challenge in the formation of stable CO2-in-water (C/W) emulsions has always been the availability of effective surfactants. Most of the surfactants being used for this purpose are expensive and difficult to synthesize, rendering the formation of C/W emulsions an uneconomical and unfavorable process. In this work, we report the use of commercial polyvinyl alcohol as an effective stabilizer for the formation of C/W emulsions at low temperatures. Porous emulsion-templated materials were prepared by the polymerization of the continuous phase of C/W emulsions. The open-cell morphology of the emulsion-templated materials was observed by scanning electron microscopy. To tune the morphology of the porous structures, the influence of the stabilizer concentration and the process of polymerization were investigated. These porous PAM materials were further evaluated for cellular growth and proliferation to demonstrate their applications in tissue engineering.
研究领域:
材料科学
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组织工程
·
聚合物化学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 40
·49200
·
IF 2.52
Yunxia Zhang,Liqin Cao,Fan Yue,Jide Wang
A clean, sulfonated, highly adsorptive macroporous monolith was constructed using a carbon dioxide-in-water (C/W) high internal phase emulsion template. The random copolymerization of N-hydroxyethyl acrylamide and sodium styrene sulfonate in the water phase was initiated with persulfate. The chemical composition of the novel sulfonated monolith was confirmed by Fourier transform infrared spectroscopy and energy-dispersive X-ray spectroscopy, and the interconnected pore structure was confirmed by scanning electron microscopy (SEM). Results showed that the void sizes were 47–92 μm and that the interconnected pore throats were approximately 10–30 μm. Such a hydrophilic, anionic macroporous material exhibited excellent adsorption properties for cationic dyes. The maximum adsorption capacity of the monolith for methylene blue (MB) and malachite green (MG) reached 1,316 and 2,624 mg/g, respectively, in 500–800 mg/L dye solution at 25°C. Furthermore, the kinetics and thermodynamic parameters of the adsorption process were examined. Experimental data exhibited that adsorption kinetically followed the pseudo-second-order model. The removal rates of MG and MB both exceeded 90% after six regenerations. The adsorption mechanism of the adsorbent was demonstrated preliminarily. The dynamic adsorption operation of MB was conducted in a fixed column, and the breakthrough curve data were fitted using the Thomas and bed depth service time models. All these findings indicated the potential industrial applications of adsorptive sulfonated macroporous monolith.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）