title: Wettability and surface composition of partly and fully regenerated cellulose thin films from trimethylsilyl cellulose.
abstract: The wettability and surface free energy (SFE) of partly and fully regenerated cellulose model surfaces from spin coated trimethylsilyl cellulose were determined by static contact angle (SCA) measurements. In order to gain detailed insight into the desilylation reaction of the surfaces the results from SCA measurements were compared with data from other surface analytical methods, namely thickness measurements, X-ray photoelectron spectroscopy (XPS) and attenuated total reflectance infrared spectroscopy (ATR-IR). Additionally, the influence of ultra high vacuum treatment (UHV) during XPS measurements on the water wettability and surface morphology of regenerated cellulose thin films was investigated. The wetting of polar and non-polar liquids increased with prolonged regeneration time, which is reflected in the higher SFE values and polarities of the films. After UHV treatment the water SCA of partly regenerated films decreases, whereas fully regenerated cellulose shows a higher water SCA. Therefore it is assumed that volatile desilylation products tend to adsorb on partly regenerated films, which strongly influences their wettability.
authors: Laboratory for Characterization and Processing of Polymers, Faculty of Mechanical Engineering, University of Maribor, Smetanova 17, SI-2000 Maribor, Slovenia.
authors: Tamilselvan
authors: T
authors: Mohan
authors: Rupert
authors: R
authors: Kargl
authors: Aleš
authors: A
authors: Doliška
authors: Alenka
authors: A
authors: Vesel
authors: Stefan
authors: S
authors: Köstler
authors: Volker
authors: V
authors: Ribitsch
authors: Karin
authors: K
authors: Stana-Kleinschek
mesh_terms: D002482:Cellulose / Q000031:analogs & derivatives / Q000737:chemistry*; D059027:Recycling; D013499:Surface Properties; D014297:Trimethylsilyl Compounds / Q000737:chemistry; D014618:Vacuum; D017155:Wettability
chemical_list: D014297:Trimethylsilyl Compounds; C480356:trimethylsilyl hydroxypropylcellulose; D002482:Cellulose