Premium
Nanoencapsulation mechanism of fragrant oil: effect of formaldehyde − melamine molar ratio
Author(s) -
Escobar Camila F,
Roldo Liane,
Rocha Tatiana LAC,
Kindlein Wilson
Publication year - 2018
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.5500
Subject(s) - nanocapsules , melamine resin , melamine , thermogravimetric analysis , differential scanning calorimetry , formaldehyde , materials science , thermal stability , chemical engineering , particle size , fourier transform infrared spectroscopy , scanning electron microscope , polymerization , polymer chemistry , polymer , chemistry , organic chemistry , composite material , nanoparticle , nanotechnology , physics , engineering , thermodynamics , coating
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. © 2017 Society of Chemical Industry