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Determining the solubility parameter and the cross-link density of medical grade silicones: Effect of increasing the range of swelling liquids

Four samples of four medical grade silicones were swollen in six "good" liquids (i.e. those with a good swelling ability, in which silicones swell appreciably) at 25°C, until they reached constant mass (i.e. equilibrium). The volume fraction, Φ, of the silicone in the swollen sample was calculated f... Full description

Contained in: Bio-Medical Materials and Engineering Vol. 25, No. 2 (2015), p. 137-142
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ISSN: 0959-2989
Additional Keywords: KURVENANPASSUNG
SILICON:POLYMER
VOLUMENFRAKTION
Notes: Copyright: Metadaten: TEMA, Copyright WTI-Frankfurt eG
Copyright: (C) Alle Rechte beim Herausgeber
Physical Description: 6 Seiten, Bilder, Tabellen, 24 Quellen
PPN (Catalogue-ID): WTI056581394
Note: WTI TEMA DB
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Internes Format
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520 |a Four samples of four medical grade silicones were swollen in six "good" liquids (i.e. those with a good swelling ability, in which silicones swell appreciably) at 25°C, until they reached constant mass (i.e. equilibrium). The volume fraction, Φ, of the silicone in the swollen sample was calculated for each grade of silicone. Using a combination of the six Φ values obtained in this study and four of those obtained in a previous study, for each silicone grade, Φ was plotted against δl, the liquid solubility parameter for the ten liquids used. Using a curve fitting technique a second-order polynomial was plotted through the data points; the minimum in this polynomial provided a value for δp (the polymer solubility parameter). Furthermore, the results showed that the δp values obtained in this study (using ten liquids) were slightly but significantly greater (p<0.05) than those obtained in a previous study (using four liquids), for grade C6-165 only. Similarly, the χ and ν values obtained in the two studies were only significantly different (p<0.05) from each other, for grade C6-165. 
653 4 |a SILICON:POLYMER 
653 4 |a VOLUMENFRAKTION 
653 4 |a KURVENANPASSUNG 
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