N - cyclohexylmaleimide was synthesized by dehydration and ring closure of n - cyclohexylmalemic acid in the presence of a catalyst consisting of a mixture of sulfuric acid and triethylamine 摘要用浓硫酸和三乙胺共催化环己基马来酰胺酸脱水关环合成环己基马来酰亚胺。
Chinese use about 6 . 5 billion pieces of disposable plastic tableware annually . plastic food wrappers containing a dangerous material deha were banned nationwide last month 大陆每年使用65亿个免洗塑胶餐具,而含有危险物质乙基己基胺( deha )的塑胶食品外包装,已在上个月遭到大陆全面禁止使用。
An efficient esterification of ferrocenecarboxylic acid and substituted phenols has been achieved using dcc / dmap protocol in ionic liquids . the corresponding esters were produced in high yields 摘要在“绿色溶剂”室温离子液体中,采用二环己基碳二亚胺4 -二甲氨基吡啶( dcc / dmap )进行二茂铁甲酸芳香酯的合成研究,反应条件温和,简单方便,产率高,该反应具有环境友好的特点。
In this paper , three alkyl substituted dimethyl phosphonates have been synthesized by trimethyl phosphite with 1 - bromopentane , 1 - bromohexane and 1 , 2 - dibromoethane . ir , 1h - nmr and 13c - nmr data of these compounds have been reported 摘要以溴戊烷、溴己烷、 1 , 2 -二溴乙烷和亚磷酸三甲酯为原料,分别合成了戊基、己基、溴乙基取代的三种膦酸二甲酯化合物。并报道了所合成的化合物的红外光谱、核磁共振氢谱及核磁共振碳谱的数据。
It has many advantages , such as the particles size is well distributed , and its diameter can be well controlled , etc . because of this virtue , reverse micelle shows broad prospects in the preparation of ferrite nanoparticles . hi this work , the syntheses of mnfe2o4 nanoparticles , cofe2o4 nanoparticles and znfe2o4 nanoparticles are prepared by the reverse micelle method , these preparations employed reverse micelles formed with anionic surfactant bis - ( 2 - ethylhexyl ) sodium sulosuccinate ( aot ) , which is considered the most effective surfactant , and another anionic surfactant bis - ( 2 - ethylhexyl ) sodium hydroxy sulosuccinate ( ahot ) , which is a new surfactant , and was synthesized by our own research group . we also synthesized znfe2o4 nanoparticles using the cationic surfactant cetyltrimethylammonium bromide ( ctab ) 本文分别采用通常被认为最佳的阴离子表面活性剂? ?二( 2 -乙基己基)丁二酸酯磺酸钠( aot ) ,和我们课题组自己设计合成的新型阴离子表面活性剂? ?二( 2 -乙基己基)羟基丁二酸酯磺酸钠( ahot )所构成的反胶束体系为微反应器,成功制备了mnfe _ 2o _ 4纳米粒子、 cofe _ 2o _ 4纳米粒子和znfe _ 2o _ 4纳米粒子;还以阳离子型表面活性剂? ?十六烷基三甲基溴化铵( ctab )构成的反胶束体系为微反应器,成功制备了znfe _ 2o _ 4纳米粒子;并探讨了表面活性剂的种类和结构对反胶束法制备铁氧体纳米粒子反应的影响。
The protected amino acids were z - ser ( bzl ) , boc - asp ( obzl ) and glu ( obzl ) 2 . the quality of the synthesized tripeptide : ser - asp - glu ( sde ) by thin layer chromatography , amino acid analysis and liquid chromatography - mass spectrometry is pure . the paam beads with different length arms were obtained by coupling the various length linear spacer , such as ethylene diamine , glutaraldehyde , 1 , 6 - diaminohexane and amino caproic acid to paam beads 按照从梭基端到氨基端的合成路线,用风n ’二环己基碳二亚胺( dcc ) l羟基苯骄三氮哩( hobt )液相合成法逐步接肽,制备得到对应的带保护基的中间体,用催化氢化还原脱去所有的保护基。
( 4 ) only when the resistance r = l / c , the transition efficiency between electric energy and heat reach its maximum value , which makes it possible to design the high performance damping composites of multi - energy transitions by adjusting the vgcf content . cpe / zkf / vgcf composites : in the cpe / pzt / vgcf composites , the conversion efficiency from force to electricity is very low because of the obvious difference of rigidity between cpe and pzt , which leads to the damping effect of multi - energy transitions is not so evident as the viscoelasticity of the matrix cpe , especially during the cpe glass transition Cpe / zkf那gcf复合材料:针对cpe / pzt / vgcf复合材料中由于cpe和pzt之间模量差异较大,导致cpe和pzt之间的应力传递欠佳,影响力一电变换效率,从而压电导电减振作用效果并不十分显著的现象;本章中采用极性有机小分子双( 2一轻基- 3一环己基一5一甲基)一苯基]甲烷( zkf ) ,而不采用pzt ,消除了pzt与cpe模量方面差异的影响。
This dissertation focuses on how to develop a high performance damping mechanism based on multi - energy transitions , which is independent or little dependant with the viscoelasticity of polymer matrix . three sections are mainly included in this dissertation as follows : chlorinated polyethylene ( cpe ) / piezoelectric ceramic ( pzt ) / vapor grown carbon fiber ( vgcf ) composites ; cpe / 2 , 2 ' - methylene - bis - ( 4 - methyl - 6 - cyclohexylphenol ) ( zkf ) / vgcf composites ; organic hybrids made from cpe and small molecules cpe / pzt / vgcf composites : the damping composites of multi - energy transitions mechanism were produced by mixing pzt and vgcf into cpe . in this system , the mechanical vibration energy that was transmitted to cpe was found to convert into joule ' s heat through conduction paths between vgcf in the polymer matrix , so the vibration fades away 本论文主要包括三个方面的研究内容: ?氯化聚乙烯( cpe ) /压电陶瓷( pzt ) /气相生长碳纤维( vgcf )复合材料; ? cpe /双[ ( 2 -羟基- 3 -环己基- 5 -甲基) -苯基]甲烷( zkf ) / vgcf复合材料; ? cpe基有机小分子混杂型复合材料cpe / pzt / vgcf减振复合材料:利用压电和导电填料填充高聚物基体,当复合材料受到机械振动时,通过高聚物基体将机械振动能传递到压电陶瓷粒子上,利用压电陶瓷的压电效应,将机械能转换成电能,则电流在导电粒子产生的回路中流动,由于导电回路具有一定的电阻,所以电能又转变成热能耗散掉,从而起到减振的目的。