图1Zn(HMDS)2催化丙交酯聚合示意图 图2(a) L-LA开环聚合动力学曲线; (b) DP=150时单体对Mn和Đ的转化率图; (c) DP与Mn和Đ的关系图; (d) PLLA链延伸的GPC图; (e) 聚乳酸1H-NMR谱; (f) 聚乳酸微观结构的1H-NMR分析。 文章还...
有机硅丙烯酸酯双子表面活性剂大分子单体以甲基丙烯酰氧基丙基三甲氧基硅烷(MPS)-聚二甲基硅氧烷(PDMS)-六甲基二硅氧烷(HMDS)为大分子单体,以双子表面活性剂为共乳化剂,通过乳液聚合的方法合成出有机硅改性丙烯酸酯共聚物,并用1 H-NMR,FT-IR,X射线衍射光谱(XPS))以及原子力显微镜(AFM)等手段进行表征.研究表明,...
将乙炔基锂加入前手性酮中,就会得到手性醇产物。该反应的活性中间体的结构经NMR光谱和固态的X射线晶体扫描后确定为立方2:2四聚体。 SN2反应: 有机锂试剂可作为亲核试剂,与烷基或烯丙基卤化物进行SN2型反应。虽然在烷基化反应中有机锂试剂比格氏试剂有着更强的反应性,但由于诸如自由基反应或金属-卤素交换反应等竞...
The 1H NMR (300 MHz) and 13C NMR (75 MHz) were recorded on Bruker 300 MHz NMR instrument. Chemical shift values were expressed in ppm (δ) relative to TMS (0 ppm), CDCl3 (7.27 ppm) for 1H NMR, and CDCl3 (77.16 ppm), for 13C NMR. High-resolution mass spectra (HRMS) were ...
The surface modifications have been repeated via Schlenk technique at the same conditions and the surface modifications were studied with 13 C CP MAS–NMR, 1 H MAS–NMR, elemental-, SEM- and BET-analysis. The surface species of the resulting catalysts are discussed. The precatalysts have been...
1H-NMR analysis revealed that HMDS molecules mainly reacted with terminal Si-H3 groups of perhydropolysilazane.doi:10.1023/A:1004415209410Y. ShimizuTonen Corporation,K. SuzukiTonen Corporation,O. FunayamaTonen Corporation,Kluwer Academic PublishersJournal of Materials Science...
以甲基丙烯酰氧基丙基三甲氧基硅烷(MPS)-聚二甲基硅氧烷(PDMS)-六甲基二硅氧烷(HMDS)为大分子单体,以双子表面活性剂为共乳化剂,通过乳液聚合的方法合成出有机硅改性丙烯酸酯共聚物,并用1 H-NMR,FT-IR,X射线衍射光谱(XPS))以及原子力显微镜(AFM)等手段进行表征.研究表明,采用双子表面活性剂作为共乳化剂,有机硅...
以甲基丙烯酰氧基丙基三甲氧基硅烷(MPS)-聚二甲基硅氧烷(PDMS)-六甲基二硅氧烷(HMDS)为大分子单体、以双子表面活性剂为共乳化剂,通过乳液聚合的方法合成出有机硅改性丙烯酸酯共聚物,并用1 H-NMR、FT-IR、X射线衍射光谱(XPS))以及原子力显微镜(AFM)等手段进行表征。研究表明,采用双子表面活性剂作为共乳化剂,有...
In this work, the surface of MCM-48 was successfully coated by a gas phase reaction with hexamethyldisilazane (HMDS). Characterisation by gas adsorption showed that the method is highly reproducible. Solid-state NMR results demonstrated that the coating was chemically attached to the surface. The ...
LiHMDS-mediated enolizations of 2-methylcyclohexanone in toluene/polydentate ligand mixtures are described. Li and N NMR spectroscopies and in situ IR spectroscopy were used to characterized and monitor reactants. Rate studies reveal that enolizations by LiHMDS in TMEDA, TMCDA, and DME proceed ...