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2018, vol. 22, br. 3, str. 125-128
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Uticaj procesnih parametara na osobine biopolimernih filmova na bazi pogače suncokreta
Effect of process parameters on biopolymer films based on sunflower oil cake
Projekat: Osmotska dehidratacija hrane - energetski i ekološki aspekti održive proizvodnje (MPNTR - 31055)
Sažetak
Obnovljive sirovine i agroindustrijski otpad su odlične sirovine za sintezu biorazgradivih polimera zbog široke rasprostranjenosti, niske cene i jednostavnosti prerade. Nusproizvodi industrije prerade ulja su pogodne sirovine za proizvodnju biopolimernih ambalažnih materijala zbog visokog sadržaja proteina. Dosadašnja brojna istraživanja pokazala su da proteini suncokreta imaju odlične sposobnosti za formiranje proteinskih filmova iz izolata pogače.Cilj ovog rada je sinteza i karakterizacija biorazgradivih kompozitnih filmova na bazi celokupne pogače suncokreta. U radu su prikazani rezultati ispitivanja uticaja procesnih parametara pH-vrednosti i temperature na osobine dobijenih filmova. Filmovi su sintetisani na različitim temperaturama: sobna, 60°C i 90°C i pri pH vrednostima 10 i 12. Dobijeni uzorci filmova okarakterisani su određivanjem mehaničkih, barijernih i fizičko-hemijskih osobina. Dobijeni rezultati pokazuju da su povećanjem vrednosti temperature i pH rasle i vrednosti zateznih jačina, dok je uzorak sa najvećim izduženjem pri kidanju bio 60°C/pH12. Vrednosti propustljivosti vodene pare su ujednačene i kreću se u opsegu 8,62-11,63 g/m2h, a niže vrednosti se uočavaju kod uzoraka sintetisanih na višim temperaturama. Prilikom određivanja propustljivosti svetlosti, uzorci se ponašaju ujednačeno i maksimalnu vrednost transmisije dostižu na 800 nm (vrednosti se kreću od 24,1% do 35,7%). Dobijene vrednosti za bubrenje i rastvorljivost su karakteristične za prirodu biopolimernih filmova. Na osnovu dobijenih rezultata karakterizacije filmova može se zaključiti da su optimalni procesni parametri za sintezu biopolimernih filmova od celokupne pogače suncokreta - temperatura 90°C i pH-vrednost 12.
Abstract
The purpose of this paper is the synthesis and characterization of biodegradable composite films based on whole sunflower oil cake, as well as the effect of process parameters (pH and temperature)on the film properties obtained. Films were synthesized at different temperatures (room temperature, 60 °C and 90 °C) and pH values (10 and 12). The film samples obtained were characterized by the mechanical, barrier and physicochemical properties determination. The experimental results showed that the tensile strength values increased with temperature and pH value increments, whereas the sample with the highest elongation at break value was 60 °C/pH12. The water vapour permeability values were uniform (8.62 g/m2h - 11.63 g/m2h), and lower values were recorded in samples synthesized at higher temperatures. The results obtained relative to light transmission were uniform, and the maximum transmission value was reached at 800 nm (24.1- 35.7 %). The values obtained for swelling and solubility parameters are characteristic of the nature of biopolymer films.
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