rate constants of the thermal dissociation of 1,1-dimethyl, 1,3-diethyl, 1,3-diisopropyl, 1,1, 3-triethyl, 1, 3-dihexyl, 1,3-dibenzyl, 1, 1-diethyl-3-isopropyl and 1,3-di-t-butyl ureas in n-butyric,n-caproic,n-capric, phenylacetic and benzoicacids were deter mined. The effects of substituents and those of solvents on the reaction rate were discussed. The transition state of the dissociation containing
Mesoporous silica MCM-41 as a highly active, recoverable and reusable catalyst for direct amidation of fatty acids and long-chain amines
作者:Kenichi Komura、Yu Nakano、Mamoru Koketsu
DOI:10.1039/c0gc00673d
日期:——
Direct amidation of fattyacids with long-chain amines was successfully performed by mesoporous silica MCM-41, which showed the highest catalytic activity among other used homo- and heterogeneous catalysts. It was found that MCM-41 can be easily recovered from the reaction mixture followed by simple calcination treatment and reused without loss of its catalytic activity.
A resin composition comprising alicyclic structure-containig polymer such as additional copolymer with monomer having norbornene structure and ethylene, hydrogenated product of ring-opening polymer with monomer having norbornene structure, and aromatic ring-hydrogenated product of copolymer with styrene and isoprene; and piperidine derivatives such as N,N'-bis(2,2,6,6-tetramethyl-4-piperidyl)-N,N'-diformyl-hexamethylenediamine and 4-(formyl amino)-2,2,6,6-tetramethyl piperidine.
The resin molded article of the present invention comprises (B) 0.1 to 5 parts by mass of a sliding agent having a weight average molecular weight of 10,000 or less, and (C) 0.01 to 3 parts by mass of a coloring agent, based on (A) 100 parts by mass of a polyacetal resin, wherein a relative element concentration ratio between carbon and oxygen on a surface thereof [C/O] (atomic %) is 1.01 to 2.50.
The resin molded article of the present invention comprises (B) 0.1 to 5 parts by mass of a sliding agent having a weight average molecular weight of 10,000 or less, and (C) 0.01 to 3 parts by mass of a coloring agent, based on (A) 100 parts by mass of a polyacetal resin, wherein a relative element concentration ratio between carbon and oxygen on a surface thereof [C/O] (atomic %) is 1.01 to 2.50.