2-巯基-5，7-二甲基-1，2，4-三唑并[1，5—α]嘧啶的合成

2-巯基-5,7-二甲基-1,2,4-三唑并[1,5—α]嘧啶是合成三唑并嘧啶类衍生物的重要中间体。实验研究了以5-氨基-3-巯基-1,2,4-嘧啶为原料,与乙酰丙酮环合制备2-巯基-5,7-二甲基-1,2,4-三唑并[1,5-α]嘧啶的工艺条件,研究结果表明,在AMZ与乙酰丙酮物质的量比为1：1．1、反应温度为120℃、反应时间为10h时,2-巯基-5,7-二甲基-1,2,4-三唑并[1,5-α]嘧啶的收率达到80％。     

一种新型巯基胺型羧酸螯合树脂的制备与表征

以环硫氯丙烷和多乙烯多胺为原料,通过交联反应合成巯基胺型树脂(PA树脂).然后用氯乙酸对PA树脂进行改性,合成巯基胺型羧酸螯合树脂(PAC树脂),并通过傅里叶红外光谱仪(FTIR)和热重分析仪(TG)对其结构和热稳定性进行表征.研究溶胀时间、介质中含水量、物料比对反应的影响,获得了较佳的工艺条件.结果表明:以三乙烯四胺为原料合成的PAC3树脂的弱酸交换容量最高,达到3.53 mmol/g.     

有机两相法制备巯基羧酸修饰的小尺寸贵金属纳米粒子

以生物相容性较好的巯基羧酸分子为保护剂、NaBH4为还原剂,采用有机两相法制备金属纳米粒子,实现了对纳米粒子的表面功能化。该方法制备的纳米材料粒径小(5 nm),单分散性好。讨论了巯基羧酸与金属前驱体之间的投料比、还原剂NaBH4的量以及巯基羧酸分子链长等因素对纳米粒子形貌的影响。除Au外,该方法还适用巯基羧酸对Ag、Pt和Pd等多种纳米粒子的表面修饰。     

Bis (2‐mercapto‐ethyl) amine modification of macroporous sulfonic resin catalyst in bisphenol‐a synthesis

A novel catalyst for bisphenol‐A synthesis was prepared by bis (2‐mercapto‐ethyl) amine adsorbed on macroporous sulfonic resin through neutralization reaction. The physicochemical properties of two resin catalysts before and after bis (2‐mercapto‐ethyl) amine absorption were compared by scanning electron microscope and nitrogen adsorption. The kinetic of the new catalyst preparation process was studied and it was found that this is a chemical adsorption and endothermic process. The adsorption rate is mainly controlled by the intraparticle diffusion, affected by boundary layer diffusion and chemical reaction as well. The thermodynamic activation parameters were calculated. Compared with unmodified catalyst, the modified resin catalyst showed higher selectivity and acetone conversion in the continuous bisphenol‐A synthesis process. © 2013 American Institute of Chemical Engineers AIChE J, 59: 3816–3823, 2013     

XPS和AES研究ACN复合剂在青铜表面上形成的膜

采用ＸＰＳ和ＡＥＳ方法,研究了含ＡＭＴ的复合物ＡＣＮ处理青铜和含粉状锈青铜的形成膜中组成及成分,结果表明膜中含有Ｎ,Ｓ,Ｃ,Ｏ和Ｃｕ,其中Ｃｕ元素以＋１价存在,且膜中无Ｃｌ元素。     

巯基中空纤维亲和膜Hg2+动态等温吸附方程的计算机模拟

在测定巯基中空纤维亲和膜对Hg ^2＋动态等温吸附方程的基础上,利用C＋＋语言编程,按Langmuir、Lang- muir-Freundlich和扩展的Langmuir 3个模型对吸附Hg ^2＋实验数据进行拟合,分别检验了实验数据的拟合程度.这3个模型对实验数据都拟合较好;相对其它两个模型,扩展Langmuir模型提供了最好的拟合,从而推断出巯基中空纤维亲和膜对Hg ^2＋的动态等温吸附是非完全的单分子层吸附.     

A novel route for the preparation of hybrid zwitterionic membranes containing both sulfonic and carboxylic acid groups

A novel route for the preparation of hybrid zwitterionic membranes containing both sulfonic and carboxylic acid groups is reported. Based on this synthetic methodology, a series of membranes were synthesized via sol–gel reaction, zwitterionization process, and the oxidization of the  SH group. FTIR spectra confirmed the corresponding reactions. The properties of these prepared membranes were characterized by ion-exchange capacity (IEC), water content, and pure water flux, etc. The anion-exchange capacity (AIEC), total cation-exchange capacity (CIEC_total), and the CIEC of the sulfonic groups (CIEC_sulf) of the membranes coated for 1–3 times were in the range of 0.017–0.12, 0.1–0.53, and 0.029–0.14 mmol g⁻¹, respectively. The measurement of water content showed that it was independent of pH values whether for the membranes coated once or twice. Pure water flux revealed a downward trend with the increased coating times. The surface SEM images of the produced membranes exhibited that these membranes' textures could be affected highly by the curing temperature, and excessively higher curing temperature would lead the membranes to brittle and chasm. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

大米陈化机理的研究及其控制对策

本文结合近几年研究工作及国内外对大米陈化研究的新进展,综合阐述了随大米存放时间的延长,其化学组织特别是大米蛋白质、类脂与淀粉的共同作用,促使羰基化合物的生成、乙醛减少、己醛增加、SH基减少,以及胞壁改变,是造成大米陈化、米饭“陈米臭”的主因.提出大米采用脱脂、除糠、低温及谷物冷却、脱氧剂应用及气控小包装等储藏技术,控制陈化米生成的对策.     

巯基-苯基聚倍半硅氧烷的合成

以巯丙基三甲氧基硅烷和苯基三甲氧基硅烷为原料,在甲醇作溶剂、浓HCl作催化剂的条件下水解缩合制备了巯基聚倍半硅氧烷和巯基-苯基聚倍半硅氧烷,并利用FTIR和GPC对合成产物进行了表征。结果表明:当苯基单体添加量为20%时,所制备的巯基-苯基聚倍半硅氧烷中均含有一定量的巯基和苯基,在引入部分苯环增加折光率的同时也保持了产物拥有进一步反应的活性巯基,且相对分子质量较大,分子量分布较窄。     

Odor similarity between stress-inducing odorants in wistar rats

Odor similarity to the odor of 4-mercapto-4-methyl-2-pentanone (I) was measured on eight rats by generalization of a conditioned avoidance response tocis- andtrans-8-mercapto-p-menthan-3-one (II and III), 3-mercapto-3-methyl-2-pentanone (V), andt-amyl mercaptan (VI). Previously, these odorants had been found to induce stress in rats in an open-field situation. In the present experiment, rats generalized the avoidance response learned with I, for V, VI, and to a lesser extenttrans-isomer III, implying odor similarities;cis isomer II was discriminated. Odor similarity between mercapto ketone I and mercaptan VI is surprising since VI lacks the keto group.