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- W2248808476 abstract "Hollow polyamide microcapsules were prepared by reacting terephthaloyl dichloride with ethylene diamine and diethylene triamine using interfacial polymerization for different reaction times. The resultant microcapsules (average diameter 28 um) had a porous shell structure with a smooth external surface and a rough internal surface. Early trials using ethylene diamine produced brittle microcapsules. Microcapsule wall thickness did not significantly increase with reaction time. But microcapsule strength was improved by changing the proportion of monomer (which gave greater cross-linking during interfacial polymerisation) and by removing any residual organic solvents before to freeze-drying. Microcapsules were functionalised using a modified DC discharge argon plasma process to induce graft co-polymerisation with 30% acrylic acid. Initial release studies using a drug model (cytochrome C) indicate that poly(acrylic acid)-grafted polyamide microcapsules could retain a compound under neutral pH and release the compound at low pH. Further investigations on developing biodegradable polymer microcapsules and the using a chemical grafting method for application in a post-ruminal controlled release delivery system are currently in progress." @default.
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- W2248808476 date "2006-01-01" @default.
- W2248808476 modified "2023-09-26" @default.
- W2248808476 title "Preparing Porous Polyamide Microcapsules with a pH-sensitive Chemical Valve" @default.
- W2248808476 hasPublicationYear "2006" @default.
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