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Synthesis of Polyacrylate/Polysiloxane Copolymer and Its Damping Performance

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过程工程学报 2003年第6期3卷 528-534页

作者：夏宇正石淑先焦书科李素青 col. Mat. Sci. & eng. Beijing Univ. Chem. Technol. Beijing 100029 China National Jewelry Quality and Inspection Center Beijing 100088 China

The copolymer of polyacrylate/polysiloxane for vibration damping materials was synthesized through emulsion polymerization. The effects of the amount of methyl methacrylate (MMA), polysiloxane containing vinyl, initiator and emulsifier on the conversion, stability of polyacrylate/ polysiloxane emulsion were discussed when the emulsion was prepared by pre-emulsifying half continuous method. The graft copolymer has good vibration damping performance. The widest glass transition region of the copolymer spans 100℃, and the highest value of tand reached 2.0. The glass transition of the samples was examined by dynamic mechanical analysis (DMA). The vibration damping performance of the graft copolymer was affected by the amount of poly-vinyl dimethylsiloxane (PVMS).

关键词：聚丙烯酸脂聚硅氧烷共聚物合成阻尼性能

Influence of Emulsification of Composite collector on Rutile Flotation

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Journal of Wuhan University of Technology(Materials Science) 2001年第2期16卷 41-43页

作者：李晔 School of Resources and Envr. eng. Wuhan University Technology Wuhan 430070 China

The emulsifiable conditions of composite collector(FP-2)inindustry are systematically re- searched in the paper. It is foundthat types of the emulsifiers, emulsification temperature, the mixedproportion of FP-2 to emulsifier are the important parametersaffecting emulsification effect rutile flotation targets. When Theproportion of FP-2 to emulsifier(E-4)is 100, by means ofemulsification of mechanical stirring, the rutile Flotation recoveryis 85.6/100 and the grade is 75.3/100, which approach the flotationtargets of FP-2 used as col- Lector by ultrasonic emulsificationunit.

关键词： reagent emulsification rutile flotation chemical interaction

Ab Initio Theoretical Prediction on Structures of Boron Cationic Cluster B_(17)^+

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Chinese Chemical Letters 1997年第8期8卷 737-740页

作者： Xu-Guang HU Yu-Min CAI Qian-Shu LI(Institute of Theoretical Chemistry, National Key Laboratory of Theoretical and Computational Chemistry, Jilin University, Changchun 130023)(Department of Chemical eng.neering, Xi an Petroleum Institute,Xi an, 710061)(col Institute of Theoretical Chemistry Natl. Key Lab. Theor. Compl. Chem. Jilin University Changchun 130023 China Departrnent of Chemical eng.neering Xi' an Petroleum Institute Xi' an 710061 China coll. of Chem. eng./Materia Science Beijing Instituteof Technology Beijing 100081 China

Four isomers of the three-dimensionally connected bare boron cationic cluster B were investigated by using ab initio molecular orbital theory at the HF/6-31G level. The results show that the D5h symmetric isomer of B ... 详细信息

关键词： Ab Initio Theoretical Prediction on Structures of Boron Cationic Cluster B