Publication year: 2011 Source: Advanced Powder Technology, Available online 20 October 2011 Naoki Tsuda, Toshiro Ohtsubo, Masayoshi Fuji 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.
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Preparation of self-bursting microcapsules by interfacial polymerization