Abstract
The sodium hydroxide aqueous solution as a hardening agent for the adhesive made of starch was microencapsulated with polymer melted at about 90℃. Microcapsules were prepared by the suspension polymerization method using styrene and ethyl hexyl aclylate monomers. In the experiment, the concentration of oil soluble surfactant, the prebulkpolymerization time and the impeller speed for preparing (W/0)/W dispersion were changed stepwise. It was investigated how these operating conditions affected the content of core material, the mean diameter and the inner structure of microcapsules. The sodium hydroxide aqueous solution could be microencapsulated under all the experimental conditions adopted here and released at about 90℃.The content of core material was decreased with the impeller speed, increased with the prebulkpolymerization time and became maximum at the concentration of surfactant of 1.0wt%.
