Environmentally Friendly and Recyclable CuCl2-Mediated C–S Bond Coupling Strategy Using DMEDA as Ligand, Base, and Solvent
作者:Guodong Shen、Xianqiang Huang、Qichao Lu、Zeyou Wang、Weiwei Sun、Yalin Zhang、Manman Sun、Zhiming Wang
DOI:10.1055/a-1561-5508
日期:2022.1
Simple reaction conditions and recyclable reagents are crucial for environmentally friendly industrial applications. An environment-friendly, recyclable and economic strategy was developed to synthesize diaryl chalcogenides by the CuCl2-catalyzed C–S bond-formation reaction via iodobenzenes and benzenethiols/1,2-diphenyldisulfanes using N,N′-dimethylethane-1,2-diamine (DMEDA) as ligand, base, and solvent
Aromatic polythioetheramides and process for their production
申请人:MITSUBISHI PETROCHEMICAL CO., LTD.
公开号:EP0162606A1
公开(公告)日:1985-11-27
Aromatic polythioetheramides have repeating units represented by one or both of the following formulae
and
wherein X is C1-C10 divalent hydrocarbon, -0-, -S-, - SO-, - SO2- or -CO-; a is 0 or 1; Y is C,-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aralkyl, C6-C20 aryl, halogen or nitro; b, c, e and f, 0 to 4; d, 0-20 and Ar is a C6-C30 aromatic ring.
Repeating units derived from C6-C30 aromatic diamines may replace up to 50 mol% of the above thioetheramide units, and from 51 to 99 mol% when Ar is isophthalyl or terephthalyl. The polymers have excellent moldability, flame retardance, heat resistance and chemical resistance, and are suitable for use as engineering plastics.
An aromatic polythioetherimide is disclosed, which comprises at least 50 mol% of a repeating unit represented by formula (I):
wherein Ar is as defined in the specification, with the total of the repeating unit(s) being 100 mol%. The polythioetherimide has an excellent balance between heat resistance and mechanical properties as well as improved moldability.
本发明公开了一种芳香族聚硫醚酰亚胺,它由至少 50 摩尔%的式 (I) 所代表的重复单元组成:
其中 Ar 如说明书中所定义,重复单元的总量为 100 摩尔%。这种聚硫醚酰亚胺在耐热性和机械性能之间取得了极佳的平衡,并改善了成型性。
Resin composition, cured product and optical parts
申请人:Tokyo Institute of Technology
公开号:EP1975192A1
公开(公告)日:2008-10-01
It is provided for a resin composition including (A) at least one polyamic acid having the structure represented by the following formula (1) :
wherein R1 is independently an alkyl group having 1 to 3 carbon atoms or a cyano group; a is independently an integer of 0 to 4; R is a tetravalent organic group; n is an integer of 1 to 4; and m is an integer of 1 to 100,000, and (E) an organic solvent.
Developing solution and method of forming polyimide pattern by using the developing solution
申请人:Yoshiaki Kawamonzen
公开号:US20010006767A1
公开(公告)日:2001-07-05
Disclosed is a developing solution for a photosensitive polyimide, which consists of an aqueous solution of an amine compound having a base dissociation index pKb [=−log (Kb)=−log (Kw/Ka)=14−pKa, where Kb is a base dissociation constant, Ka is acid dissociation constant of a proton complex, pKa is an acid dissociation index of a proton complex=−log (Ka), and Kw is an ion product of water=1×10
−14
] of 5 to 8 within an aqueous solution of 25° C.