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| Titel: |
Water Sorption of a Polyurethane/Bentonite Composite: Effects of Bentonite Content and Drying Conditions |
| Auteur: |
Pinto, M. R. O. Silva, S. M. de L. de Carvalho, L. H. d'Almeida, J. R. M. |
| Verschenen in: |
International journal of polymeric materials |
| Paginering: | Jaargang 56 (2007) nr. 9 pagina's 885-892 |
| Jaar: |
2007-09 |
| Inhoud: |
In the present work, compression molded polyurethane/bentonite composites were manufactured and their water sorption characteristics were determined as a function of filler content and drying conditions. The matrix was a polyurethane derived from castor oil and the filler was a commercially available sodium bentonite. Filler contents varied from 0 to 10% by weight. The effects of three filler drying conditions, that is, 1 h at 200°C; 1 h at 110°C, and 24 h at 110°C, on the water sorption behavior of PU/bentonite composites with 5% w/w filler loading were also analyzed. The experimental results show that the water sorption behavior of the composites could be satisfactorily modeled by the Fickian model, and that the amount of absorbed water increases with the filler loading. It was also observed that, within the first 200 h of immersion, composite water sorption was lower than that of the polymeric matrix alone. The data evince that although only minor differences were noted, water sorption is reduced when the filler was dried at higher temperatures. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 45 van 45 gevonden artikelen
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