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Current Issue
2004 Vol.21 Issue.4,
Published 2004-07-15
Article
Article
235
Preparation and Properties of Hydrophilic Polyurethane Pressure Sensitive Adhesives for Skin
LI Jun, GONG Zhi-chao, DENG Lian-dong, DONG An-jie
To overcome the shortcomings of the nature rubber pressure sensitive adhesives(PSAs) used in the present transdermal drug delivery systems(TDDs) of traditional Chinese medicine,the preparation and characteristic of hydrophilic polyurethane pressure sensitive adhesives(HPPSAs) were studied. The HPPSAs were synthesized by the condensation copolymerization of polymer glycol, diisocyanate and extender. Especially, polyethylene glycol(PEG) on the main chain of the polyurethane can offer good hydrophilicity. The experiment results indicated that the HPSAs synthesized in this paper could provide excellent adhesive strength and repeating sticking properties, and also good compatibility with drug and skin, which can promote drug releasing property.
2004 Vol. 21 (4): 235-238 [
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239
Influence of CaO on Naphthalene Conversion in Nickel-Based Catalyst
LI Zeng-xi~1,JIAO Ming-shu~
The catalysts of Ni/Al_2O_3 and Ni-Ca/Al_2O_3 were prepared respectively by impregnation and co-impregnation. The effect of CaO incorporation on the conversion of naphthalene, yields and selectivities of H_2,CO, had been investigated. The difference of the ratio of H_2/CO, the carbon deposit and the amount of the organic by-products between the catalysts Ni-Ca/Al_2O_3 and Ni/Al_2O_3 had been compared. It had been confirmed that adding the CaO not only improve the conversion of naphthalene and the yields of H_2, CO, but also increase the selectivities of H_2,CO_2, nevertheless decrease the selectivity of CO. It is also found that the catalyst with CaO can improve the ratio of H_2/CO and decrease the carbon deposit, but do not affect the sort of the by-products and the content of the benzene.
2004 Vol. 21 (4): 239-243 [
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244
Thermodynamic Prediction on the Preparation of Multiwall Carbon Nanotubes via Chemical Vapor Deposition of Hydrocarbon and CO
PEI Zhen-zhao, WU Jun-sheng, WANG Li-sheng
Influences on the percentage of deposited carbon from hydrocarbon via chemical vapor deposition at 700 K to (1 500 K,)101×10~3 Pa and CO via chemical vapor deposition at 700 K to (1 200 K),101×10~3 Pa were calculated by use of the CVD (chemical vapor deposition) software developed by the scientists of Russia Academy of Science.And curves of the phase boundary of carbon deposition were drawn according to the composition of reactants at the phase boundary of carbon deposition.The carbon deposition area was predicted.Catalysts suitable for different situations were selected.The calculated results provided useful references for the preparation of multiwall carbon nanotubes.
2004 Vol. 21 (4): 244-247 [
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1904
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248
Development of Supported TiO_2 Photocatalysts
WANG Zu-yuan, ZHANG Feng-bao, ZHANG Qian-cheng
TiO_2 photocatalysis is an energy-saved and high efficiency green environmental technology.TiO_2 photocatalyst has an attractive application perspective in wastewater treatment,air purification and material (self-)cleaning. It is very important to immobilize the TiO_2 photocatalyst onto substrates for designing high efficient photocatalytic reactors. In this paper the recent progress of TiO_2 photocatalyst is reviewed. Furthermore, types and effects of the supports, immobilization methods, influence of supports on photocatalytic activities are emphasized. The problems and development trends of TiO_2 photocatalysts have also been pointed out briefly.
2004 Vol. 21 (4): 248-253 [
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254
Progress on Basic Features of Expanded Bed Adsorption Chromatography
GUAN Hong-xin, HU Hong-bo, ZHANG Xue-hong, TANG Yong-lian
With merits of both fluidized bed and packed bed,the technology of expanded bed adsorption chromatography can capture product directly from the crude feed without removal of solid particles previously.But the technology is not well developed and operations are instable.In order to probe into the mechanism of expansion and adsorption,researches on basic characteristics of expanded bed,such as hydrodynamics,adsorption,interaction of cell and adsorption etc,in recent years are reviewed.
2004 Vol. 21 (4): 254-258 [
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259
Advance in Preparation of Biodegradable Nanoparticles
ZHANG Shuang-nan, XU Xiao-qiu, LI Jing-qing, CHANG Jin
As a new drug delivery and controlled release device,biodegradable polymeric nanoparticles appear to be very promising and have been widely studied. Nanoparticles have more advantages over the microparticles,such as lowering toxicity,shielding odor and controlling release of drug effectively.Due to their subcellular size, nanoparticles can be absorbed by the cells through the tissue matrix and penetrate into the arterial wall without causing trauma,and even be able to cross the blood-brain barrier(BBB). This review emphasizes to introduce the manufacturing techniques of biodegradable nanoparticles and their influence factors.
2004 Vol. 21 (4): 259-262 [
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1750
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263
Synthesis and Properties of Fluoropolymer Emulsion Paintings
QU Jin-qing, MAO Shu-cai, CHEN Huan-qin
Fluoropolymer emulsions may acquire extensive application in high weather-resistance coating and special properties paints because of its excellent surface properties,weatherability and environment friendship.The preparation methods and materials such as (fluoro-monomer) and fluorosurfactants of fluoropolymer emulsion were reviewed.The relationship between structure and properties of fluoropolymer emulsion was discussed.The key study work of fluoropolymer emulsion was pointed out.
2004 Vol. 21 (4): 263-267 [
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268
Removal of Persistent Organic Pollutants in Wastewater by Electrochemical Oxidation Technology
LI Tian-cheng, PIAO Xiang-lan, ZHU Shen-lin
There are small amount of persistent organic pollutants existed in water systems,and this does great harm to human beings and biology. It is necessary to remove these materials immediately. However,it is no use for the common water treatment technologies. As some new semi-conductor electrodes doped with additives were prepared,the electrochemical oxidation technology may efficiently oxidize persistent organic pollutants into CO_2 and H_2O under normal temperature and pressure thoroughly,and there are no extra pollutions produced. In this article,the developments of electrochemical oxidation technology on treating persistent organic pollutants were discussed,meantime,the electrochemical oxidation mechanisms and all kinds of influential factors were introduced,and the emphasis was placed on the structures and properties of electrodes.
2004 Vol. 21 (4): 268-271 [
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272
Development of Reversed Micellar Technology in Biology Engineering
WENG Ya-jun, ZHOU Xiao-hua
A brief survey is presented on the recent fundamental research and application of reversed micellar extraction.It is also concluded that,as a novel medium for enzyme catalysed reaction,reversed micelle has remarkable advantages and features.On the basis of results obtained in many researches, the application of reversed micelle,the activity and stability of enzyme in reversed micelle are introduced.
2004 Vol. 21 (4): 272-275 [
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276
Progress on Catalytic Partial Oxidation of Methane to Syngas
SUN Chang-geng, LIU Zong-zhang, ZHANG Min-hua
Progress on catalytic partial oxidation of methane to syngas was reviewed.Two main mechanisms of oxidation were recommended,i.e.direct oxidation and indirect oxidation.Attention was given to Nisupported catalysts.The characteristics of fixed bed reactor,fluidized bed reactor,membrane reactor and other reactors which were developed recently were summarized.
2004 Vol. 21 (4): 276-280 [
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281
Research and Advance in Properties and Microstructures of Dimeric and Oligomeric Surfactants
LIANG Huan~1, MA Bo~2, ZHU Sen~1, FENG Zhi-qiang~1,CHENG Fa~1
Dimeric and oligomeric surfactants are novel surfactants that are presently tending towards the application in the academic research and industrial communities.Based on the latest advance in the surfactants,this paper focuses on two aspects of critical micelle concentration and microstructure,presents and reveals the inner theory and promising application by using comparison and contrast method.
2004 Vol. 21 (4): 281-286 [
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1984
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287
Solubilities of Penicillin G Potassium and Penicillin G Sodium in Mixtures Containing n-Butyl Acetate
WEI Dong-wei, JIANG Hao-xi, LI Fu-sheng, JIN Ke-xin
Solubilities of penicillin G potassium in the mixtures of n-butyl acetate with water ranging from 0.6 to 9.0 mL in 100 mL solvents were measured at 23.5 ℃,46.7 ℃ and 52.0 ℃.In several individual mixtures of n-butyl acetate with water,acetic acid or ethanol,solubilities of penicillin G potassium or sodium were determined at 27.0—50.0 ℃.The results could be used in the crystallization procedure of penicillin G potassium or penicillin G sodium.
2004 Vol. 21 (4): 287-289 [
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290
Growth Conformation Differences of Wax Crystals in Diesel Fuels with/without EVAP
HU Rui-jie~1, WU Chuan-jie~1, CAO Hui~2, BAO Jia-kun~1, HAN Yong-cai~1, ZHANG Jin-li~1
Low-temperature micrography technology was applied to the real-time observation of the growth conformation differences of wax crystals in diesel fuel with/without EVAP,and XRD was also performed.The results showed that with the addition of EVAP,the dispersity,integrity and crystallinity of the wax crystals in the diesel fuel were all enhanced greatly the cold flow properties of the diesel fuel were improved.
2004 Vol. 21 (4): 290-292 [
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1970
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293
Determination of Aggregation Properties of Gemini Solution by Steady-State Fluorescence Method
CHENG Fa, ZHENG Bao-Jiang, ZHU Sen, LIANG Huan
The aggregation properties of synthesized Gemini anionic surfactant solution were measured by (steady-)state fluorescence method.The measured results were in accordance with the results by other methods such as electronic conductivity and surface tension,therefore,steady-state fluorescence method was proved to be feasible as a method of measuring aggregation properties of anionic Gemini.And the variational rule of fluoresence intension close to critical micelle concentration C_(cmc) of Gemini and monomer-surfactant was briefly analyzed.
2004 Vol. 21 (4): 293-295 [
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1964
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296
Development of Waterborne Polyurethane Coatings
ZHANG Hui, SHEN Hui-fang, HUANG Hong, LI Yong-jin, CHEN Huan-qin
With the social progress,the consciousness of protecting environment is getting strengthened.Developing green and environmental protection coatings will become the major direction.This article reviews the classification and performance of waterborne polyurethane coatings,and indicates their development trends.
2004 Vol. 21 (4): 296-299 [
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300
Progress on Gas-Liquid Mass Transfer in Slurry Bubble Column Reactor
LIU De-lin, JIN Hai-bo, TONG Ze-min
The characteristic of gas-liquid mass transfer in slurry bubble column reactor(SBCR) is reviewed. Effects such as pressure,temperature,superficial gas velocity,character of liquid, solid concentration and its characteristic on the characters of mass transfer are discussed in detail. Moreover, the mass transfer models about slurry bubble column are also summarized and the perspective of SBCR is introduced.
2004 Vol. 21 (4): 300-304 [
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305
Application of PSRK Equation of State to Predicting Vapor-Liquid Equilibria at High Pressures
GAO Xiao-lin, LI Zhi-jian, LI Min
To predict the vapor-liquid equilibria at high pressures, a group contribution equation of state called PSRK was proposed, wherein the excess Gibbs free energy mixing rule and the UNIFAC model were combined with SRK equation of state. PSRK equation of state was applied to predicting the vapor-liquid equilibria of five binary systems at different temperatures and pressures, the relative average deviations of the experimentally determined vapor pressure and vapor molar faction with calculated results were 2.16% and 1.01%, respectively. The comparision of the results showed that the PSRK equation of state can be successfully used to predict vapor-liquid equilibria at high pressures, and its accuracy was slightly higher than that of the MHV1 and MHV2 model.
2004 Vol. 21 (4): 305-307 [
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308
Progress on Mathematic Models and Algorithms for the Steady-State Reactive Distillation Process
JIAO Zi-hua, ZHOU Chuan-guang, ZHAO Wen
The reactive distillation that combines reaction and separation in the same vessel has achieved wide and quick development in recent years. This article describes the equilibrium stage model, non-equilibrium stage model and non-equilibrium stage cell model that are used in the steady-state simulation of the reactive distillation at length and summarizes the algorithms of each model. On the basis of analyzing and comparing these models and their algorithms, the future trends and advances are proposed.
2004 Vol. 21 (4): 308-313 [
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