Dynamic Ureas with Fast and pH‐Independent Hydrolytic Kinetics
作者:Kaimin Cai、Hanze Ying、Jianjun Cheng
DOI:10.1002/chem.201801138
日期:2018.5.23
and synthesis of a new type of hydrolysable polymer that has identical hydrolysis kinetics from pH 3 to 11. The unprecedented pH independent hydrolytickinetics of the aryl ureas were shown to be related to the dynamic bond dissociation controlled hydrolysis mechanism; the resulting hindered poly(aryl urea) can be degraded with a hydrolysis half‐life of 10 min in solution. More importantly, these fast
This report focuses on epoxy‐dicyandiamide (DICY) curingsystemaccelerated by N‐aryl‐N′,N′‐dialkyl urea, aiming at clarifying the accelerating mechanism and the relationship between accelerating effect and molecular structure of the accelerators. Nine N‐aryl‐N′,N′‐dialkyl ureas were synthesized and investigated with measurements of differential scanning calorimetry, thermo gravimetric/differential