DMSO溶液浓度对玻璃化后结构参数的影响

采用分子模拟的手段计算了70%、50%和30%DMSO溶液的密度、RDF、RMSD、DMSO-H2O空间角度关系、氢键数量、键长和键角的分布。计算表明:三种浓度的溶液密度、RDF、RMSD、氢键数量构成表现不同的特征。而三种浓度的溶液的DMSO-H2O空间角度分布具有相似性、取向性和周期性的特点,三种浓度的DMSO分子C-S键长、O-S键长、C-S-C键角、O-S-C键角都有相似的特征:一部分在一个数值段类高斯分布,而一部分集中在一个数值。     

溶液聚合过程中AN-IA共聚物粘均分子量的测定

在溶液聚合的转化率比较高时,直接对反应液进行稀释并测其粘度来求聚合物的分子量。简化了通常测定过程中的压膜、烘干、重新溶解等步骤,明显缩短了测定的时间,更能适合于现场分析。对于丙烯腈与衣糠酸在二甲基亚砜中的共聚物,利用单点法进行测定,相对误差为1％。     

丙基乙烯基亚砜的合成

本文以正丙硫醇和环氧乙烷为原料,经开环加成,脱水和氧化反应合成丙基乙烯基亚砜,用IR,′H-NMR光谱对产物进行了表征。本合成方法适合于其他低碳(≤C_6)烷基或苯基乙烯基亚砜的合成。     

三聚氰酸在二甲基亚砜中溶解度的测定与关联

用计算机在线检测的激光监视动态法测定三聚氰酸在二甲基亚砜中的溶解度,并分别用Apelblat溶解度方程和简化的溶解度方程对实验数据进行了关联.关联结果分别为lnx=-94.21 3.162×10 3/T 13.80lnT和lnx=-0.863 0-1.239×10 ./T,所得平均相对误差分别为0.55%和0.75%,模型基本上可满足工程设计的需要.     

二甲基亚砜的工业氧化生产方法

介绍了二甲基亚砜的用途及前景,阐述了采用氧化二甲基硫醚来生产二甲基亚砜的工业方法,并对主要的工艺控制指标进行了探讨和总结。     

Liquid–liquid extraction of Hg(II) from acidic chloride solutions using bis‐2‐ethylhexyl sulfoxide

The liquid–liquid extraction of Hg(II) from acidic chloride solutions has been studied using bis‐2‐ethylhexyl sulfoxide (B2EHSO) as an extractant. For comparison, extraction studies have also been carried out using di‐n‐octyl sulfoxide (DOSO) and diphenyl sulfoxide (DPhSO). The extraction data have been analysed by both graphical and theoretical methods taking into account aqueous phase speciation and all plausible complexes extracted into the organic phase. These results demonstrate that Hg(II) is extracted into xylene as HgCl₂.3R₂SO (where R₂SO represents the sulfoxide). The equilibrium constant of the extracted complex has been deduced by non‐linear regression analysis. The developed liquid–liquid extraction procedure has been applied for the recovery of mercury from the brine‐sludge of a Chlor‐Alkali plant. © 2001 Society of Chemical Industry     

亚砜配体在金属催化烯丙基官能团化反应中的应用

过渡金属催化的烯丙基官能团化反应在有机合成中具有重要作用,是构建碳碳键和碳杂原子键的重要方法。亚砜配体以其独特的立体化学性质,不仅在传统的（Tsuji-Trost）烯丙基取代反应中取得优异结果,而且在烯丙基碳氢活化反应中展现出巨大潜力。本文根据产生烯丙基钯中间体的催化反应机理及亚砜配体配位模式的不同,总结了近些年亚砜配体在传统的烯丙基取代、烯丙基碳氢官能团化及不对称烯丙基碳氢官能团化领域的最新研究进展,指出影响各个催化体系的关键因素及所存的问题并对今后发展做出了展望。     

Novel carboxymethyl derivatives of chitin and chitosan materials and their biomedical applications

Chitin and chitosan are natural biopolymers that are non-toxic, biodegradable and biocompatible. In the last decade, chitin and chitosan derivatives have garnered significant interest in the biomedical and biopharmaceutical research fields with applications as biomaterials for tissue engineering and wound healing and as excipients for drug delivery. Introducing small chemical groups to the chitin or chitosan structure, such as alkyl or carboxymethyl groups, can drastically increase the solubility of chitin and chitosan at neutral and alkaline pH values without affecting their characteristics; substitution with carboxyl groups can yield polymers with polyampholytic properties. Carboxymethyl derivatives of chitin and chitosan have shown promise for adsorbing metal ions, as drug delivery systems, in wound healing, as anti-microbial agents, in tissue engineering, as components in cosmetics and food and for anti-tumor activities. This review will focus on the preparative methods and applications of carboxymethyl and succinyl derivatives of chitin and chitosan with particular emphasis on their uses as materials for biomedical applications.     

石油亚砜从酸性硫脲浸金液中萃取Au(Ⅰ)的性能及机理

本文探讨了各种主要因素对石油亚砜从酸性硫脲浸金液中萃取Au(Ⅰ)的影响、用亚硫酸钠溶液从萃Au(Ⅰ)有机相中反萃Au(Ⅰ)的可能性,以及在酸性硫脲介质中亚砜萃取Au(Ⅰ)的机理。