AZETIDINE-2,4-DIONES VIA PHOTOCYCLIZATION OF<i>N</i>-FORMYL-<i>N</i>-METHYL α,β-UNSATURATED AMIDES
作者:Kazuhiro Maruyama、Takeshi Ishitoku、Yasuo Kubo
DOI:10.1246/cl.1980.265
日期:1980.3.5
Upon irradiation N-formyl-N-methylcyclohexene-1-carboxamide (2a) cyclized to give N-methylcyclohexane-l,1-dicarboximide (3a) in a high yield. The reaction proceeds via intramolecular hydrogen abstraction. Similarly, several other alkyl-substituted azetidine-2,4-diones were synthesized.
Azetidine-2,4-diones as catalysts for caprolactam polymerization
申请人:THE DOW CHEMICAL COMPANY
公开号:EP0155535A2
公开(公告)日:1985-09-25
An improved process for the anionic polymerization of lactams is described. Particular azetidinedione compounds are employed as promoters and their use not only permits low polymerization temperatures but gives rise to faster polymerization reactions than prior art procedures allow.
The rapid polymerization of caprolactam in accordance with the present invention makes the process particularly suited to RIM procedures for preparing molded polyamides.
本发明描述了一种改进的内酰胺阴离子聚合工艺。 本发明采用了特定的叠氮二酮化合物作为促进剂,使用这些化合物不仅可以降低聚合温度,而且聚合反应的速度也比现有工艺要快。 本发明中己内酰胺的快速聚合使得该工艺特别适用于制备模塑聚酰胺的 RIM 工艺。
ELECTROLYTE FOR FUEL CELL, ELECTROLYTE MEMBRANE FOR FUEL CELL, BINDER FOR FUEL CELL, MEMBRANE ELECTRODE ASSEMBLY FOR FUEL CELL, AND FUEL CELL
申请人:Kawada Nobuo
公开号:US20100143764A1
公开(公告)日:2010-06-10
Disclosed is an electrolyte for fuel cells, which is mainly composed of a copolycondensate of a polyimide having an alkoxysilyl group at an end and an alkoxysilane having an ion-conducting group. Also disclosed are an electrolyte membrane for fuel cells, a binder for fuel cells and a membrane electrode assembly for fuel cells, each using the electrolyte, and a fuel cell using such a membrane electrode assembly for fuel cells. The electrolyte enables to obtain an electrolyte membrane, a binder and a membrane electrode assembly, each having high ion conductivity, high strength, high toughness, low swelling and low fuel permeability suitable for fuel cells. By using such an electrolyte, there can be obtained a low-cost fuel cell having high output power and high durability.