Preparation of self-bursting microcapsules by interfacial polymerization

Here, we describe a new technique for microencapsulating pyriproxyfen, a widely used insect growth regulator. Using interfacial polymerization, we successfully prepared self-bursting microcapsules that retained their shape when suspended in water but break open quickly after the water evaporates. In order to investigate the self-bursting phenomenon, we studied the relationship between formulation factors such as volume median diameter (D) or wall thickness (T) and the physical strength of the obtained polyurethane films. As a result, it was found that T and the structure of isocyanate affected the self-bursting phenomenon.