Microencapsulation of fragrant oil via in situ polymerization: Effects of pH and melamine-formaldehyde molar ratio

H. Y. Lee, S. J. Lee, I. W. Cheong, J. H. Kim

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

Microcapsules containing fragrant oil (Foral oil) were synthesized via the in situ polymerization method using melamine-formaldehyde (M-F) as a wall material. The encapsulation efficiency and other physical properties were analysed with varying formaldehyde/melamine (F/M) mole ratio and pH of emulsion medium. The pH of the reaction medium was varied from 5.0-6.0 and the F/M molar ratio, 2.3∼5.5. Microcapsules containing fragrant oil were synthesized successfully and their particle sizes ranged from 12-15 μm. Encapsulation efficiency of fragrant oil varied from 67-81%. It was found that both pH and F/M molar ratio have an effect on the separation of M-F prepolymer, consequently the morphology of the surface of the microcapsule was changed as well as encapsulation efficiency. The encapsulation mechanism, focusing on the liquid-liquid phase separation of methylolmelamines and formation of M-F precursor particle, was described to explain the surface morphology and encapsulation efficiency.

Original languageEnglish
Pages (from-to)559-569
Number of pages11
JournalJournal of Microencapsulation
Volume19
Issue number5
DOIs
Publication statusPublished - 2002 Sep 1

Fingerprint

Microencapsulation
melamine
Drug Compounding
Melamine
formaldehyde
Formaldehyde
Polymerization
Encapsulation
Oils
polymerization
oils
Capsules
prepolymers
Liquids
Emulsions
Particle Size
Phase separation
emulsions
Surface morphology
melamine formaldehyde

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Pharmaceutical Science
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Colloid and Surface Chemistry

Cite this

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abstract = "Microcapsules containing fragrant oil (Foral oil) were synthesized via the in situ polymerization method using melamine-formaldehyde (M-F) as a wall material. The encapsulation efficiency and other physical properties were analysed with varying formaldehyde/melamine (F/M) mole ratio and pH of emulsion medium. The pH of the reaction medium was varied from 5.0-6.0 and the F/M molar ratio, 2.3∼5.5. Microcapsules containing fragrant oil were synthesized successfully and their particle sizes ranged from 12-15 μm. Encapsulation efficiency of fragrant oil varied from 67-81{\%}. It was found that both pH and F/M molar ratio have an effect on the separation of M-F prepolymer, consequently the morphology of the surface of the microcapsule was changed as well as encapsulation efficiency. The encapsulation mechanism, focusing on the liquid-liquid phase separation of methylolmelamines and formation of M-F precursor particle, was described to explain the surface morphology and encapsulation efficiency.",
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Microencapsulation of fragrant oil via in situ polymerization : Effects of pH and melamine-formaldehyde molar ratio. / Lee, H. Y.; Lee, S. J.; Cheong, I. W.; Kim, J. H.

In: Journal of Microencapsulation, Vol. 19, No. 5, 01.09.2002, p. 559-569.

Research output: Contribution to journalArticle

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AU - Lee, H. Y.

AU - Lee, S. J.

AU - Cheong, I. W.

AU - Kim, J. H.

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