Hybrid palm-oil/styrene-maleimide nanoparticles synthesized in aqueous dispersion under different conditions.
J Microencapsul
; 32(4): 336-48, 2015.
Article
in En
| MEDLINE
| ID: mdl-26057257
ABSTRACT
Poly(styrene-co-maleic anhydride) was imidized with ammonium hydroxide and palm oil, resulting in an aqueous dispersion of hybrid nanoparticles with diameters 85-180 nm (dispersed) or 20-50 nm (dried). The reaction conditions were optimized for different precursors by evaluating the relative amount ammonium hydroxide and maximizing the incorporated palm oil up to 70 wt.%. The interactions between palm oil and polymer phase have been studied by TEM, IR, Raman spectroscopy and thermal analysis (TGA, [TM] DSC). From Raman spectra, the amount of imide and reacted oil were quantified. Through concurring effects of imidization and coupling of fatty acids, the imidization needs a slight excess of NH3 relatively to maleic anhydride. The oxidative stability highly depends on oxidative crosslinking of free or non-reacted oil. Comparing the imide content from spectroscopic and thermal analysis suggests that a complex rigid imide phase without strong relaxation behavior has formed in combination with oil.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Polystyrenes
/
Plant Oils
/
Nanoparticles
/
Maleates
/
Maleimides
Language:
En
Journal:
J Microencapsul
Journal subject:
FARMACIA
Year:
2015
Document type:
Article
Affiliation country:
Germany
Publication country:
ENGLAND
/
ESCOCIA
/
GB
/
GREAT BRITAIN
/
INGLATERRA
/
REINO UNIDO
/
SCOTLAND
/
UK
/
UNITED KINGDOM