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Effect of temperature on electrophoresis velocity of sol particles in water

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Journal of Harbin Institute of Technology(New Series) 2002年第4期9卷 348-350页

作者： BAO Zhi-yu(鲍治宇) GU Da-ming(顾大明) dept. of Environment Protection Suzhou University of Science and Technology Suzhou 215011 China Dept. of Chemistry Harbin Institute of Technology Harbin 150090 China

Viscosity of water is affected by temperature and electrophoresis velocity is related to the viscosity of colloid. However, there hasn’t been any direct description about the relation between electrophoresis velocity of colloid and temperature. Based on a large number of tests, the relation between electrophoresis velocity and temperature is established as [v=A+B(T-T°)]. Meanwhile the ratio of the electric charge (q) of sol particles to their radium (r) is a constant is obtained. The results of above were testified in both experiment and theory.

关键词： electrophoresis velocity viscosity temperature iron hydroxide colloidal sol

The effects of coagulants on the structure of PBO materials

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Journal of Harbin Institute of Technology(New Series) 2006年第5期13卷 541-544页

作者：李金焕黄玉东孟琳 dept. of Applied chemistry Harbin Institute of Technology Harbin 150001China dept. of Chemical Engineering Daqing Vocational College Daqing 163255 China

PBO materials possess super mechanical properties and high thermal and chemical resistance due to their special rigid-rod backbones with heterocyclie chemical structure and supermolecular microstrueture. But these structures may be affected by a series of preparing technologies, among which the coagulant is even more important. In this paper the chemical and microstrueture changes of PBO materials coagulated with different solvents were investigated. Analyses of molecular weight and chemical structure of PBO coagulated indicate that the heteroeyclie ring of PBO will experience cleavage in coagulation and in this stage water plays an important role. The final structure of PBO materials may involve several intermediate structures lying between benzoxazole a,d the open ring. Wide-angle X-ray diffraction （WAXD） 20 scans and scanning probe microscope （ SPM ） show that the microstrueture of PBO materials eoagulated in solvents with different properties will change a lot and those coagulants with the smaller rate of diffusion like methanol can cause more ordered molecule alignment containing fewer voids.

关键词： PBO ( poly( p-phenylene benzobisoxazole) ) coagulation eoagulants structure

ZEOLITE－CATALYZED　FRIEDEL－CRAFTS　ACYLATION　OF　AROMATICS∶Ⅲ．SYNTHESIS　OF　4－ACYL　ANISOLE　WITH　USY　CATALYST

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Chinese Chemical Letters 1996年第3期7卷 233-236页

作者： Yu Dao MA Qi Long WANG Xing Dong JI Chang Ming ZHONG(Department of chemistry,Shandong University, Jinan, 250100)and Qin QIU(Department of Environmental Engineering, Shandong UniversityJinan, 250100) Department of chemistry Shandong University Jinan 250100 dept. of Environmental Engineering Shandong University Jinan 250100

The synthesis with high yield of a series of4-acyl anisole was performed through the Friedel-Crafts reaction of anisole with alkanoic or substituted benzoic acids in thepresence of an ultrastable Y zeolite (USY) catal... 详细信息

关键词： USY CATALYST ACYLATION ACYL

Zeolite－Catalyzed　Friedel－Crafts　Acylation　of　Aromatics．Ⅳ．Nature　of　the　Active　Sites　of　Zeolites

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Chinese Chemical Letters 1996年第9期7卷 841-844页

作者： Yu Dao MA Qi Long WANG Wei JIANG Be Jun ZUO and Qin QIU(Department of chemistry,Shandong University,Jinan 250100.)(Department of Environmental Engineering, Shandong University,Jinan 250100.) Department of chemistry Shandong University Jinan 250100 dept. of Environmental Engineering Shandong University Jinan 250100

For zeolite-catalyzed Friedel-Crafts acylation of aromatic rings,the Lewis acid sites were found to be active;while the Bronsted acid sites with moderate strength were found to be inactive.

关键词： Nature Aromatics the Active

Addition of Ce as additive to Pb-Ca-Sn-Al grid alloy for lead acid battery

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Journal of Harbin Institute of Technology(New Series) 2003年第1期10卷 28-30页

作者：魏杰王东田栾中华郭强 dept. of Applied chemistry Harbin Institute of Technology Lalin Lead Acid Battery Factory

The study on three Pb Ca Sn Al alloys with 0.08%, 0.4% and 1.0% of Ce indicates that the addition of Ce results in an obvious increase in the tensile strength and hardness of the alloys, an increase in the overpotentials of hydrogen and oxygen evolution and the corrosion resistance as well. The study on the corrosion film formed on the alloys by cyclic voltammetry shows that the addition of Ce slows down the formation of corrosion film. It is therefore concluded from the experimental results that the addition of Ce can increase the tensile strength and HB of Pb Ca alloy and the tensile strength and HB of the alloy increase with the increase of Ce; the addition of Ce also increases the hydrogen and oxygen evolution overpotentials of Pb Ca alloy, and when the content of Ce is 1.0%, the alloy has the highest hydrogen and oxygen evolution overpoteatials; the addition of Ce improves the anticorrosion capability of the alloy, and when the content Ce is 1.0%, the alloy has the best anticorrosion capability; and the addition of Ce also slows down the formation of corrosion film.

关键词： lead acid battery grid alloy Ce electrochemical performance

Preparation, morphology and mechanical properties of acrylate-modified polyurethane/unsaturated polyester resin graft-IPNs

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Journal of Harbin Institute of Technology(New Series) 2003年第1期10卷 7-10页

作者：唐冬雁乔英杰赵连城 dept. of Applied chemistry Harbin Institute of Technology School of Material Science and Technology Harbin Institute of Technology dept. of Chemical Engineering Harbin University of Science and Technology

Acrylate modified polyurethane resin was first synthesized, and interpenetrated with unsaturated polyester resin to form IPNs and gradient IPNs which cured at room temperature. The polymerization process was traced by an IR spectroscopy technique and the simultaneous interpenetrating techniques were determined. The morphology of these IPNs were estimated by TMA and TEM methods. The results indicated that large amount of interpenetrating and entanglement make T g  linked up effectively, and domains between two phases can be in nanometre ranges, which changed with composition ratios. The mechanical properties results showed that IPNs varied from elastomeric to plastic materials. It was noteworthy that, with the introduction of modified groups and the formation of graft construction in IPNs, the miscibility in the systems was improved a lot. These further led to the improved mechanical properties of IPNs with elastomer reinforced and plasticizer toughened as well. The reinforced miscibility between the networks can apparently change mechanical property especially for the gradient ones when the materials are elongated.

关键词： acrylate modified polyurethane unsaturated polyester resin (UP) interpenetrating polymer networks(IPNs) morphology mechanical property

Microstructure and Phase Behavior of Cationic Gemini/Anionic Polyelectrolyte/Water Ternary System

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过程工程学报 2006年第2期6卷 296-301页

作者：皮瑛瑛尚亚卓彭昌军刘洪来 dept. chemistry and State Key Lab. Chem. Eng. East China Univ. Sci. & Technol.

The microstructure of cationic gemini surfactant 1,6-bis(dodecyldimethylammonium) hexane dibromide C12H25(CH3)2N(CH2)6N(CH3)2C12H252Br (126122Br) and oppositely charged polyelectrolyte poly(acrylic acid, sodium salt) (NaPA) in aqueous solution has been studied by using fluorescence, conductivity measurement, freeze-etching and TEM. The data obtained from fluorescence and conductivity measurement show that micelle-like or complex can form between the gemini surfactant (126122Br) and polyelectrolyte NaPA due to the static electric interaction and hydrophobic forces. Through freeze-etching and TEM, the microstructure of the mixture solution has been studied, which is consistent with the result from micropolarity. Comparing the fluorescence spectrum of system of dodecyltrimethylammonium bromide (DTAB) and NaPA with that of system of gemini surfactant (126122Br) and NaPA, it can be found that the interaction between gemini surfactant (126122Br) and NaPA is stronger than that between DTAB and NaPA. And the phase behavior of (126122Br) and NaPA in aqueous solution has also been detected. It can be shown that the precipitate will transform into gel in higher NaPA concentration.

关键词：表面活性剂高分子电解质分子交互作用微胶粒显微结构

LIVING/CONTROLLED GRAFTING FROM POLYMER MICROSPHERES

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Chinese Journal of Polymer Science 2003年第6期21卷 639-651页

作者： Harald D. H. Stver dept. of chemistry McMaster University Hamilton ON L8S 4MI Canada

A review is given of grafting-from methods using living polymerizations, with emphasis on grafting from polymermicrospheres using ATRP.

关键词： Living controlled polymerization Grafting ATRP Microspheres

Removal of benzene homologous compounds with chlorine dioxide

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Journal of Environmental Sciences 1996年第3期8卷 321-327页

作者： Chen Hui Wei Dongbin(chemistry Department, Northwest Normal University, Lanzhou 730070,China)Wang Shuyan Zhu Mingyang Liu Zhaochang(Department of Environmental Engineering, Tsinghua University, Beijing 100084, China)Keng Zhu(chemistry Department, Pekin chemistry Department Northwest Normal University Lanzhou 730070 China dept. of Environmental Engineering Tsinghua University Beijing 100084 China chemistry Department Peking University Beijing 100871 China

Chlorine dioxide composite disinfectant generator that produces a mixture of the oxidant gases comprising chlorine dioxide, chlorine, ozone and hydrogen peroxide through electrolyzing salt,is widely utilized in China *** experiments in the paper focused on the removal of benzene homologous compounds such as styrene, methyl and dimethyl benzene. The results indicated that pH value was the most crucial factor to influence the treatment effects while reaction time and input way were considered as the importance. The removal rate for benzene could reach 60% when above 80% for methyl, and 100% for styrene and dimethyl. The variation mechanisms between chlorine dioxide,chlorite and chloride which determine the drinking water quality also discussed.

关键词： Benzene homologous compounds chlorine dioxide drinking water treatment