Using chain extenders to modify release rates of orange oil from poly(urea-urethane) microcapsules
| Autor: | Aljoša Vrhunec, Jurij Puslar, Dejan Štefanec |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Release behaviour
Methylene diphenyl diisocyanate Orange oil Ethylenediamine Polyethylene glycol lcsh:Chemistry chemistry.chemical_compound Monomer lcsh:QD1-999 Polymerization chemistry Diethylenetriamine Polymer chemistry Interfacial polycondensation General Earth and Planetary Sciences Microencapsulation General Environmental Science Polyurea |
| Zdroj: | Acta chimica slovenica Acta Chimica Slovenica, Vol 62, Iss 3, Pp 700-708 (2015) |
| Popis: | Poly(urea-urethane) and polyurea microcapsules were prepared by an interfacial polymerisation using orange oil as a core material and a mixture of polymeric 4,4-methylenediphenyldiisocyanate and toluene diisocyanate in a molar ratio of 1:0.2 as oil-soluble monomers. The membrane composition, its thickness and other properties were varied by changing the type and amount of oil-soluble monomers and water-soluble chain extenders, such as ethylenediamine and diethylenetriamine based on amine groups and 1,4-butanediol and polyethylene glycol 400 based on hydroxyl groups. Studies of the morphology and release behaviour of microcapsules show high dependency on the reaction conditions and reactants’ properties. The release rate of the orange oil from microcapsules is highest when using a polymeric linear chain extender, polyethylene glycol with a molecular mass of 400. Improved mechanical stability and a slower release rate of microcapsules were achieved by a thicker membrane and by using the branched multi-functional chain extender diethylenetriamine. |
| Databáze: | OpenAIRE |
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