The acetoacetyl group can be used to improve superabsorbent resins since it is more active than the hydroxyethyl group. The acetoacetyl group can be introduced into the side group of hydroxyethyl cellulose (HEC) to a...The acetoacetyl group can be used to improve superabsorbent resins since it is more active than the hydroxyethyl group. The acetoacetyl group can be introduced into the side group of hydroxyethyl cellulose (HEC) to activate HEC using the ester exchange reaction between HEC and ethyl acetoacetate (EAA) to improve HEC grafting. This paper discusses the main factors affecting the reaction, such as the amount of EAA and catalyzer, the reaction temperature, and the reaction time. The acetoacetyl group was successfully introduced into HEC. Within specified ranges, increasing the amount of EAA, the reaction temperature and the reaction time will increase the acetoacetylation.展开更多
A polyacrylate comprising acetoacetyl group and a polyurethane with vinyl end groups have been prepared.These two polymers could crosslink with each other to form a composite coating in the presence of a basic catalys...A polyacrylate comprising acetoacetyl group and a polyurethane with vinyl end groups have been prepared.These two polymers could crosslink with each other to form a composite coating in the presence of a basic catalyst at room temperature.A model Michael reaction between ethyl acetoacetate (EAA) and methyl acrylate (MA) was used to investigate the crosslinking mechanism.The results indicate that the two active hydrogen atoms in the acetoacetyl group could both react with vinyl groups to form mono and bis adducts in a two step process.展开更多
文摘The acetoacetyl group can be used to improve superabsorbent resins since it is more active than the hydroxyethyl group. The acetoacetyl group can be introduced into the side group of hydroxyethyl cellulose (HEC) to activate HEC using the ester exchange reaction between HEC and ethyl acetoacetate (EAA) to improve HEC grafting. This paper discusses the main factors affecting the reaction, such as the amount of EAA and catalyzer, the reaction temperature, and the reaction time. The acetoacetyl group was successfully introduced into HEC. Within specified ranges, increasing the amount of EAA, the reaction temperature and the reaction time will increase the acetoacetylation.
文摘A polyacrylate comprising acetoacetyl group and a polyurethane with vinyl end groups have been prepared.These two polymers could crosslink with each other to form a composite coating in the presence of a basic catalyst at room temperature.A model Michael reaction between ethyl acetoacetate (EAA) and methyl acrylate (MA) was used to investigate the crosslinking mechanism.The results indicate that the two active hydrogen atoms in the acetoacetyl group could both react with vinyl groups to form mono and bis adducts in a two step process.
