A method for the determination of the surface tension of cellulosic fibres in their natural state and its relation with chemical composition
| Autor: | J.M. van Hazendonk, J.T.F. Keurentjes, J.C. van der Putten |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 1995 |
| Předmět: |
chemistry.chemical_classification
Wax Materials science biology Polymer Instituut voor Agrotechnologisch Onderzoek biology.organism_classification Kenaf Surface tension Contact angle chemistry.chemical_compound chemistry visual_art Agrotechnological Research Institute visual_art.visual_art_medium Life Science Hemicellulose Wetting Composite material Cellulose |
| Zdroj: | Cellulose and cellulose derivatives: Physio-chemical and industrial applications. Abington: Woodhead Publishing Cellulose and cellulose derivatives: Physio-chemical and industrial applications |
| Popis: | The surface tensions of several natural cellulosic fibres like flax, hemp, kenaf and cotton and a synthetic cellulosic fibre have been determined using the so-called floating test. This method determines the liquid surface tension γ F at which fibres placed on a liquid surface remain just floating. It can be shown that γ F is the liquid surface tension at which the contact angle θ = 0°. By measuring γ F in both a polar and an apolar liquid system, the fibre surface tension γ S and its dispersive and polar parts, γ s d and γ s p , respectively, can be calculated using the harmonic mean approximation. The fibre surface tensions found for untreated and extracted natural fibres are in good agreement with literature data for surface tensions of various fibre components such as cellulose, hemicellulose, lignin and waxes. Untreated natural cellulosic fibres proved to be very hydrophobic due to a waxy layer on their surface. Extraction of fatty substances significantly increases the fibre surface tension. This method can be very useful in predicting the wettability of fibres by the surrounding polymer matrix in fibre-reinforced composite materials. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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