20.500.12556/RUL-152984 Biokompozitni / bionanokompozitni filmi na osnovi polivinil alkoholne matrice, ojačane s celuloznimi nanofibrilami in različnimi tipi taninov Biocomposite / bionanocomposite films based on polyvinyl alcohol reinforced with cellulose nanofibrils and different types of tannins Cilj naše študije je bil razviti več različnih formulacij biokompozitnih in bionanokompozitnih filmov na osnovi polivinil alkohola (PVA) z dodatkom ojačitvene komponente – celuloznih nanofibril (CNF) in različnih tipov biološko aktivnih taninov – taninske kisline (TA), galne kisline (GA) in kostanjevega tanina (KT). CNF smo dodali v utežnem deležu 2 %; TA, GA in KT pa v utežnem deležu 4 % glede na PVA. S 4 % dodatkom TA v PVA matrico smo pripravili biokompozitni film, ki je izkazoval več kot 25 % višjo natezno trdnost v primerjavi z osnovnim PVA filmom. Z dodatkom 2 % CNF in 4 % TA v PVA matrico smo pridobili bionanokompozitni film (P2C4T) z izboljšanim modulom elastičnosti in natezno trdnostjo, hkrati pa smo z omenjenima dodatkoma povečali tudi fleksibilnost pripravljenega nanokompozita, saj je bila vrednost raztezka pri pretrgu za končni formulirani film (P2C4T) več kot 50 % višja od raztezka pri pretrgu za osnovni PVA film. Hidrofilnost površine dvokomponentnih PVA filmov je bila nižja, trikomponentnih pa višja. The aim of our study was to develop biocomposite and bionanocomposite films based on polyvinyl alcohol (PVA) with the addition of a reinforcing component – cellulose nanofibrils (CNF) and different types of biologically active tannins – along with tannic acid (TA), gallic acid (GA) and chestnut tannin (KT). CNF was added in a weight percentage of 2%, while TA, GA and KT had a weight percentage of 4% in relation to PVA. The addition of 4% TA to the PVA matrix resulted in a biocomposite film with more than 25% higher tensile strength compared to the neat PVA film. By adding 2% CNF and 4% TA to the PVA matrix, a bionanocomposite film (P2C4T) with an improved elastic modulus and higher tensile strength was obtained. At the same time, the flexibility of this bionanocomposite was greatly increased, as the elongation at the breaking of the final formulated film (P2C4T) was more than 50% higher than the elongation at break of the neat PVA film. The surface hydrophilicity of the two-component PVA films was lower, while that of the three-component films was higher. biokompozitni filmi bionanokompozitni filmi polivinil alkohol celulozne nanofibrile taninska kislina galna kislina kostanjev tanin biocomposite films bionanocomposite films polyvinyl alcohol cellulose nanofibrils CNF tannic acid gallic acid chestnut tannin true false true Slovenski jezik Angleški jezik Neznano 2023-12-13 13:28:52 2023-12-13 13:28:56 2024-04-24 09:54:34 0000-00-00 00:00:00 2023 0 0 Str. 69-80 št. 2 Let. 72 2023 0000-00-00 Zaloznikova NiDoloceno NiDoloceno 0000-00-00 0000-00-00 2023-01-01 630*813.6 2590-9932 10.26614/les-wood.2023.v72n02a06 176678403 RAZ_Osolnik_Ursa_2023.pdf RAZ_Osolnik_Ursa_2023.pdf 1 F5582332B3143B64A2CAB6A38BEF1999 71d1779287e99b4eccb9901f65771351722ab36d58f5a9a2da0b7393f744232b 415a924d-99b3-11ee-9499-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=178751 https://journals.uni-lj.si/les-wood/article/view/16406 1 2fa537da-99b3-11ee-9499-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=178750 Biotehniška fakulteta Les 0 0 0