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200m^3自航四开体石驳的总体设计 被引量:1
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作者 杜小明 《珠江水运》 2019年第5期22-23,共2页
介绍长江上游200m^3自航四开体石驳的总体设计方案内容,着重对主尺度、布置方案、开体方式、结构形式、主要设备的选取等作了分析和研究。
关键词 石驳 主尺度 四开体 船舶设计
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Cationic Ring Opening Polymerization of Octamethylcyclotetrasiloxane Initiated by Acid Treated Bentonite 被引量:5
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作者 陈碧 詹晓力 +1 位作者 易玲敏 陈丰秋 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2007年第5期661-665,共5页
Cationic ring opening polymerization of octamethylcyclotetrasiloxane (Da) initiated by acid treated bentonite was investigated. The experimental conditions were chosen on the basis of preliminary experiments.Higher ... Cationic ring opening polymerization of octamethylcyclotetrasiloxane (Da) initiated by acid treated bentonite was investigated. The experimental conditions were chosen on the basis of preliminary experiments.Higher temperature was found beneficial for the reaction process while stirring intensity beyond a certain level showed no obvious effect on the reaction rate. Polymers were characterized by Fourier transform infrared, proton nuclear magnetic resonance (IH-NMR) and gel perneation chromotography. The width of molecular mass distribution was found ranging between 1.2 and 1.4, which is extraordinarlly narrow compared with that of cationic polymerizations reported elsewhere (〉 1.9). The results were believed due to the absence of free proton and counter ion which simplifies the polymerization process and the huge steric hindrance provided by bentonite particles which keeps the propagation of polysiloxane onto the surface of bentonite particles in a much more regular way. A feasible mechanism is proposed and seems to be supported well by experiments. Additionally, from the results of α, ω-dihydrogen terminated polysiloxanes prepared, the possibility of applying this potential environmentally friendly heterogeneous catalyst in industrial polymerization of cyclosiloxanes is anticipated. 展开更多
关键词 OCTAMETHYLCYCLOTETRASILOXANE cationic polymerization POLYSILOXANE
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