| 摘要 |
The invention provides a dispensing composition for the controlled release of semiochemicals, such as pheromones, wherein the semiochemical is enclosed in a network of a crosslinked polymer which is substantially free of radical initiator residues. The dispensing composition can be prepared by mixing a prepolymer with the semiochemical and optional additives and crosslinking the mixture by means of gamma radiation or electron beam treatment, or by UV radiation or heat in the presence of a radical initiator, the residues of which are subsequently extracted. The prepolymer is preferably an acrylate or methacrylate terminated prepolymer. The rate of release of the semiochemical can be varied by modifying the network density, the type of prepolymers, the degree of loading and the shape of the dispenser. Vulnerable semiochemicals can be stabilized by adding stabilizers, such as UV absorbers and antioxidants. The predetermined release rate can be sustained for several months. The composition can be shaped or applied as a coating. |
