Main-chain sulphur containing water soluble poly(N-isopropylacrylamide-co-N,N′-dimethylacrylamide sulphide) copolymers via interfacial polycondensation
作者:Ujjal Haldar、Latha Ramakrishnan、Kannan Sivaprakasam、Priyadarsi De
DOI:10.1016/j.polymer.2014.09.008
日期:2014.10
lower glass transition temperature (Tg) values. The thermaldegradation behavior and the major degradationproducts have been characterized by thermogravimetric analysis (TGA) and electron-impact mass spectroscopy (EI-MS), respectively. Both the studies reveal that the degradation takes place due to weak-link scission of the polymeric main chain. Solubility in water and in most of the common organic solvents
这里,我们报告水溶性聚的第一合成(Ñ -isopropylacrylamide-共- Ñ,Ñ '二甲基丙烯酰胺硫醚)共聚物通过使用相转移催化剂(PTC)常规界面缩聚法。具有不同脂族链长和抗衡离子的各种PTC的作用被用来检查多硫化物聚合物形成的动力学。反应性比率是通过扩展的Kelene–Tüdös方法使用1 H NMR分析获得的进料组成确定的,表明N-异丙基丙烯酰胺(NIPAM)的反应性比N,N高。单硫化物和二硫化物聚合物中的'-二甲基丙烯酰胺(DMA)。通过差示扫描量热法(DSC)研究的热转变行为表明,随着硫化物主链键的硫级增加,聚合物的柔韧性增加,这是由较低的玻璃化转变温度(T g)值。热降解行为和主要降解产物已分别通过热重分析(TGA)和电子冲击质谱(EI-MS)进行了表征。两项研究均表明,降解是由于聚合物主链的弱连接断裂而发生的。甚至在主链中硫的等级从1增加到2之后,在水和大多数常见
Pyrazole amides
申请人:The Upjohn Company
公开号:US04072498A1
公开(公告)日:1978-02-07
The present invention discloses amides and thioamides substituted in the .alpha. or .beta. position with substituted pyrazoles which are useful as herbicides.
本发明公开了取代吡唑基的酰胺和硫代酰胺,其在α或β位置上取代,可用作除草剂。
Knunyants,I.L. et al., Journal of general chemistry of the USSR, 1962, vol. 32, # 4, p. 1235 - 1246
作者:Knunyants,I.L. et al.
DOI:——
日期:——
NaIO<sub>4</sub>-Mediated Selective Oxidative Halogenation of Alkenes and Aromatics Using Alkali Metal Halides
作者:Gajanan K. Dewkar、Srinivasarao V. Narina、Arumugam Sudalai
DOI:10.1021/ol0358206
日期:2003.11.1
[reaction: see text] NaIO(4) oxidizes alkali metal halides efficiently in aqueous medium to halogenate alkenes and aromatics and produce the corresponding halo derivatives in excellent regio and stereoselectivity. The system also demonstrates the asymmetric version of bromo hydroxylation using beta-cyclodextrin complexes, resulting in moderate ee.