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Ethyl 2-diazo-3-oxo-perfluorocarboxylates as a Potentially Fluorine-containing Building Block:[Rh(OAc)_2]_2-Catalyzed Reaction with Nitriles
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《厦门大学学报(自然科学版)》 CAS CSCD 北大核心 1999年第S1期241-241,共1页
关键词 Rh OAC Ethyl 2-diazo-3-oxo-perfluorocarboxylates as a Potentially Fluorine-containing Building Block Catalyzed Reaction with nitriles
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潜油螺杆泵定子橡胶摩擦磨损行为研究 被引量:16
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作者 王哲 王世杰 吕晓仁 《机械设计与制造》 北大核心 2014年第2期163-166,共4页
采用MPV-600型微机控磨粒磨损试验机考察了潜油螺杆泵定子丁腈橡胶(NBR)和氟橡胶(FPM)与转子45#钢配副在干摩擦条件下的磨损行为,并用扫描电子显微镜-X射线能量散射分析(SEM-EDXA)法对橡胶的磨痕表面形貌、元素含量进行分析。结果表明:... 采用MPV-600型微机控磨粒磨损试验机考察了潜油螺杆泵定子丁腈橡胶(NBR)和氟橡胶(FPM)与转子45#钢配副在干摩擦条件下的磨损行为,并用扫描电子显微镜-X射线能量散射分析(SEM-EDXA)法对橡胶的磨痕表面形貌、元素含量进行分析。结果表明:两种橡胶在低载荷条件下的干摩擦磨损主要是以滞后摩擦为主,而较高载荷时NBR的磨损机制表现为粘着磨损;橡胶磨损的物理过程为微切削作用产生的微观分子断裂,随着载荷的增大,宏观分层剥落逐渐起主导作用;干摩擦过程中橡胶分子链发生断裂形成大分子自由基,大分子自由基异构化并发生氧化反应。 展开更多
关键词 螺杆泵 干摩擦 丁腈橡胶 氟橡胶 摩擦磨损机理 物理效应 化学效应 nitrile BUTADIENE Rubber(NBR) Fluororubber (FPM)
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CATALYTIC BEHAVIOR OF PQLYMER-BOUND PALLADIUM COMPLEXES FOR DECARBONYL-ARYLATION
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作者 Guo Zhongcheng and Liu Hanfan (Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China) 《分子催化》 EI CAS CSCD 1989年第S1期22-28,共7页
The activities and stabilities of the polymer-bound palladium complexes fordecarbonyl-arylation were investigated in this paper.It was found that the activities ofpolymer-bound complexes are comparable to those of the... The activities and stabilities of the polymer-bound palladium complexes fordecarbonyl-arylation were investigated in this paper.It was found that the activities ofpolymer-bound complexes are comparable to those of their homogeneous counterparts.Among the catalysts examined,the sulfur-containing polymer-bound palladium complexeshave high activity and better stability than the phosphine-,amine-and nitrile-containingpolymerie palladium catalysts.Experimental work was undertaken to evaluate the possibleside reactions.The factors which caused the catalyst deactivation were discussed and the in-flucnce of experimental parameters on the reaction was studied as well. 展开更多
关键词 PALLADIUM complexes nitrile comparable ACRYLATE reused BENZOYL catalyzed mercapto POLYMERIC
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