Mechanical strength of microcapsules made of different wall materials

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Colleges, School and Institutes


The mechanical strength of microcapsules made of three different wall materials, including melamine-formaldehyde resin, urea-formaldehyde resin and gelatin-gum arabic coacervate, were measured by a micromanipulation technique. Single microcapsules were compressed to large deformations or rupture and the force being imposed on them were measured simultaneously. Melamine-formaldehyde and urea-formaldehyde microcapsules showed clear bursting under compression, and their bursting force, deformation at bursting and deformation at a pesudo yield point were determined. Gelatin microcapsules did not show clear bursting under compression, and their mechanical strength was characterized by the force required to cause their deformation to 50%. The mechanical strengths of these three types of microcapsules are compared in this paper. (C) 2002 Elsevier Science B.V. All rights reserved.


Original languageEnglish
Pages (from-to)307-311
Number of pages5
JournalInternational Journal of Pharmacy
Issue number1-2
Publication statusPublished - 21 Aug 2002


  • urea-formaldehyde, gelatin, microcapsules, micromanipulation, formaldehyde, melamine, mechanical strength