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1.
Mild oxidation of cellulose fibers using dioxygen as ultimate oxidizing agent
Gabriela Biliuta, Lidija Fras Zemljič, Valeria Harabagiu, Sergiu Coseri, 2011, izvirni znanstveni članek

Opis: Two types of regenerate cellulose fibres were oxidized under mild conditions, by using N-hydroxyphthalimide as catalyst and molecular oxygen as ultimate oxidizing agent. The amounts of negatively charged groups introduced were determined by means of potentiometric titration. The degree of polymerization and molar mass of the oxidized fibres determined viscosimetrically, has been found to be almost unaffected during oxidation.
Ključne besede: viscose fibers, modal fibers, oxidation, N-hydroxyphthalimide, NHPI, phthalimide-N-oxyl radical, PINO
Objavljeno: 01.06.2012; Ogledov: 949; Prenosov: 28
URL Povezava na celotno besedilo

2.
Chemical modification and characterization of poly(ethylene terephthalate) surfaces for collagen immobilization
Mioara Drobota, Zdenka Peršin, Lidija Fras Zemljič, Tamilselvan Mohan, Karin Stana-Kleinschek, Aleš Doliška, Matej Bračič, Volker Ribitsch, Valeria Harabagiu, Sergiu Coseri, 2013, izvirni znanstveni članek

Opis: The functionalization of poly(ethylene terephthalate) (PET) surface films by reactions with multifunctional amines such as triethylenetetramine (TETA), and tetraethylenepentamine (TEPA) was investigated. For the functionalization of PET films surface we used a new way of treatment, a 'sandwich model'. Physical-chemical properties of functionalized PET films were analysed. Qualitative and quantitative determination of the introduced amine groups were examined by means of Fourier Transform Infrared Attenuated Total Reflexion(FTIR - ATR), X-ray photoelectron spectroscopy (XPS), and potentiometric titration. Gained wetting properties were determined by using contact angle measurements and thoroughly analysed by acid-base approach. In addition, surface topography was investigated by atomic force microscopy (AFM). The amount of the introduced amino groups after TETA incorporation has been found to be two times higher as compared to TEPA. Wetting properties were significantly improved after aminolysis. Surface free energy was higher for PET - TETA treated film than that observed for PET - TEPA treated which is in accordance with titration results. The collagen immobilization onto PET treated films was evidenced by using AFM and subsequently by using XPS.
Ključne besede: PET, aminolysis, AFM, collagen immobilization
Objavljeno: 03.04.2017; Ogledov: 479; Prenosov: 211
.pdf Celotno besedilo (2,48 MB)
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