7 research outputs found
Effect of emulsion preparation method on microencapsulation of <i>n</i>-octadecane using melamine-formaldehyde pre-polymers
101-106The
microcapsules containing n-octadecane as the core material and
melamine-formaldehyde resin as the wall material have been synthesized by in situ polymerization method. A
systematic study has been carried out to investigate the effect of the method
used in the preparation of reaction emulsion mixture, and the curing conditions
used during the encapsulation process on the properties of microcapsules. The
microcapsules so obtained are characterized for their core content, encapsulation
efficiency, mean particle size distribution, and thermal & solvent
stability. Using the modified encapsulation process with a
formaldehyde-to-melamine molar ratio of 8 and core-to-wall ratio of 2,
microcapsules with a high core content of 70% and a heat storage capacity of >160
J/g could be obtained. The capsules are found to be stable at temperatures more
than 80 °C and to cyclohexane wash