聚酰亚胺织物的羧基化表面改性

为提高聚酰亚胺织物的服用性能,采用碱剂对聚酰亚胺织物表面进行羧基化改性处理。借助X 射线光电子能谱、红外光谱、热重、热阻、湿阻等测试手段研究了碱处理后聚酰亚胺织物的性能,并探讨了阳离子染料对其的染色性能。结果表明：碱处理可对聚酰亚胺纤维进行有效的改性;碱处理在聚酰亚胺纤维表面引入大量氧元素,纤维分子中引入了羧基和酰胺酸;改性后聚酰亚胺织物热稳定性保持良好;碱处理后聚酰亚胺织物热阻、湿阻略有下降,极限氧指数可达到37%,阻燃性能优异;聚酰亚胺纤维羧基化改性增加了阳离子染料的亲和力,平衡上染百分率显著提高,染色吸附等温线符合Langmuir 吸附模型。     

羧基化改性静电纺天然棕色棉纤维素膜的金属铜离子吸附性能

为探究静电纺纤维素膜对重金属离子的吸附性能,在用静电纺成功制备天然棕色棉纤维素膜的基础上,进行了Cu~(2+)吸附性能的研究。结果表明:静电纺纤维素膜材料和原棉纤维相比具有很高的Cu~(2+)吸附能力,在不同p H值条件下可分别达到原棉的3~5倍;静电纺纤维素膜经羧基化改性后,可极大提高Cu~(2+)的吸附容量,在此条件下静电纺纤维素膜吸附量可高达约250 mg/g;羧基化改性静电纺纤维素膜对Cu~(2+)的吸附具有快速性,80%以上的吸附量可在16 s左右完成;羧基化改性静电纺纤维素膜对Cu~(2+)的吸附具有饱和性和单分子层吸附特性;制备的羧基化静电纺纤维素膜的理论单层饱和吸附量为526.3 mg/g,Langmuir特征常数为7.133×10~(-6)L/mg。     

Multiple Organolithium Generation in the Continuous Flow Synthesis of Amitriptyline

A continuous flow protocol for the preparation of the tricyclic antidepressant (TCA) amitriptyline is reported. The advantages of flow chemistry when handling organometallic agents as well as when performing reaction with gases are demonstrated. Continuous multilithiation combined with carboxylation and the Parham cyclization, a Grignard addition and thermolytic water elimination by inductive heating are key features of the multistep protocol.

     

溶剂法合成2-羟基-3-萘甲酸技术进展

介绍了国内外溶剂法生产２－羟基－３－萘甲酸的进展情况,并推荐采用溶剂法规模化生产２－羟基－３－萘甲酸     

Single‐Pot Ethane Carboxylation Catalyzed by New Oxorhenium(V) Complexes with N,O Ligands

The oxorhenium(V) chelates [ReOCl(N,O‐L)(PPh₃)] [N,O‐L=(OCH₂CH₂)N(CH₂CH₂OH)(CH₂COO) ( 2 ), (OCH₂CH₂)N(CH₂COO)(CH₂COOCH₃) ( 3 )] and [ReOCl₂(N,O‐L)(PPh₃)] [N,O‐L=C₅H₄N(COO‐2) ( 4 ) C₅H₃N(COOCH₃‐2)(COO‐6) ( 5 )] have been prepared by reaction of [ReOCl₃(PPh₃)₂] ( 1 ), in refluxing methanol, with N,N‐bis(2‐hydroxyethyl)glycine [bicine; N(CH₂CH₂OH)₂(CH₂COOH)], N‐(2‐hydroxyethyl)iminodiacetic acid [N(CH₂CH₂OH)(CH₂COOH)₂], picolinic acid [NC₅H₄(COOH‐2)] or 2,6‐pyridinedicarboxylic acid [NC₅H₃(COOH‐2,6)₂], respectively, with ligand esterification in the cases of 3 and 5 . All these complexes have been characterized by IR and multinuclear NMR spectroscopy, FAB⁺‐MS, elemental and X‐ray diffraction structural analyses. They act as catalysts, in a single‐pot process, for the carboxylation of ethane by CO, in the presence of potassium peroxodisulfate K₂S₂O₈, in trifluoroacetic acid (TFA), to give propionic and acetic acids, in a remarkable yield (up to ca. 30%) and under relatively mild conditions, with some advantages over the industrial processes. The picolinate complex 4 provides the most active catalyst and the carboxylation also occurs, although much less efficiently, by the TFA solvent in the absence of CO. The selectivity can be controlled by the ethane and CO pressures, propionic acid being the dominant product for pressures about ca. 7 and 4 atm, respectively (catalyst 4 ), whereas lower pressures lead mainly to acetic acid in lower yields. These reactions constitute an unprecedented use of Re complexes as catalysts in alkane functionalization.     

聚吡咯/羧酸化细菌纤维素复合材料的电学性能研究

基于细菌纤维素的多羟基结构，对其进行羧酸化改性；接着以羧酸化细菌纤维素为模板，原位复合聚吡咯（PPy），得到PPy/羧酸化细菌纤维素导电复合材料。并对其微观形貌、化学结构、热稳定性等进行测试表征，重点研究了用不同浓度的氧化剂处理后，复合材料电学性能的变化。结果表明，电子电导率随氧化程度的提高而升高，最高可达10^-3 S/cm，编号为0.04-48h的样品具有最佳的离子电导率。     

粮仓建筑密封膏用无乳聚合胶乳的研制

根据粮仓建筑密封膏的理化特性和对所用乳液理化性能的要求,对胶乳进行了分子设计.对胶乳分子设计中一些关键因素如单体的选择、羧基化及交联进行了详细讨论,并提出了工艺条件选择的一些依据.     

溶剂法生产2—羟基—3—萘甲酸

介绍了国内外生产２－羟基－３－萘甲酸的现状,阐述了溶剂法的优越性,提出了采用溶剂法生产２－羟基－３－萘甲酸的建议。     

Free Radical‐Mediated Acylation and Carboxylation Reactions

Radical acylations to prepare carbonyl compounds are described and focus on indirect acylation approaches using sulfonyl oxime ethers under tin‐mediated and tin‐free conditions. The efficiency of carboxylic acid derivatives as carbonyl group radical acceptors in radical acylation and carboxylation reactions is discussed.