Interactions with water of mixed acetic-fatty cellulose esters |
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Authors: | J Peydecastaing C Vaca-Garcia E Borredon |
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Institution: | 1.INRA, UMR 1010, ENSIACET,Toulouse Cedex 4,France;2.Université de Toulouse,Toulouse,France |
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Abstract: | Cellulose powder was acylated with mixtures containing acetic, fatty and acetic-fatty anhydrides to form acetic-fatty cellulose
esters. The total degree of substitution (DS) of the mixed cellulose esters (MCE) ranged from 2 × 10−2 to 2.92. MCE were characterized by their interactions with water. Static contact angles with water were measured on a regular
smooth surface. The values found were dependent on the fatty acyl content and independent of the acetyl content. In the case
of acetic-oleic cellulose esters, the minimum DS of the oleoyl moiety required to obtain permanent water repellency was 3 × 10−4. The microporosity of the samples may account for this exceptional hydrophobic character. Nevertheless, water vapor adsorption
measurements on powder samples revealed only a limited increase in hydrophobicity of the MCE compared to cellulose acetate
with the same acetyl content. It was thus demonstrated that water repellency and vapor water adsorption are not correlated. |
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