Mechanical strength of microcapsules made of different wall materials.
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.
Sun
G
G
School of Chemical Engineering, Queen's University Belfast, BT9 5AG, Belfast, UK.
Zhang
Z
Z
D002214:Capsules / Q000737:chemistry*; D004548:Elasticity; D005079:Excipients; D005780:Gelatin; D006244:Hardness; D010316:Particle Size; D012116:Resins, Plant
D002214:Capsules; D005079:Excipients; D012116:Resins, Plant; D005780:Gelatin