Naslov
Nanoencapsulation mechanism of fragrant oil: effect of formaldehyde-melamine molar ratio

Autori
Escobar, Camila Ferreira ; Roldo, Liane ; Rocha, Tatiana L. A. C. ; Kindlein, Wilson, Jr.

Izvornik
Polymer international (0959-8103) 67 (2018), 2; 220-226

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
nanocapsules ; formaldehyde-melamine ; in situ polymerization ; fragrant oil

Sažetak
Encapsulation of essential oils by in situ polymerization is commonly used to contain the oil and thus ensure its controlled release. Melamine resin formaldehyde is one of the most widely used shell materials due to its thermal and chemical stability. One of the factors that influences the properties of the capsules is the molar relationship between monomers. The effect of formaldehyde − melamine (F/M) molar ratios 3, 4 and 6 on the nanoencapsulation, morphology and properties of nanocapsules was investigated. The morphology and particle size were investigated by the scanning electron microscopy and atomic force microscopy techniques. The composition of the formaldehyde − melamine resins was determined by Fourier transform infrared spectroscopy, and the thermal stability of the nanocapsules was analysed by differential scanning calorimetry and thermogravimetric analysis. Increasing the formaldehyde content reduced the nanocapsules' chemical stability. The capsule sizes obtained were nanometric at all melamine − formaldehyde ratios studied, with a non‐significant variation in particle size and shape.

Izvorni jezik
Engleski

Znanstvena područja
Interdisciplinarne tehničke znanosti

POVEZANOST RADA