Thermoreversible gelation of cellulose acetate solutions studied by differential scanning calorimetry

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Altena, F.W. and Schroder, J.S. and Huls, R. van de and Smolders, C.A. (1986) Thermoreversible gelation of cellulose acetate solutions studied by differential scanning calorimetry. Journal of Polymer Science, Part B: Polymer physics, 24 (8). pp. 1725-1734. ISSN 0887-6266

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Abstract:Thermoreversible gels of cellulose acetate can be obtained by cooling concentrated cellulose acetate solutions in solvent-nonsolvent mixtures of dioxane and water. Upon heating the gels, endothermic effects were observed with differential scanning calorimetry. The heat effects are ascribed to the melting of a crystalline phase consisting of cellulose triacetate units. The endothermic peaks appear only after long aging periods of up to several days. Melting points generally decrease and heats of melting increase with increasing polymer concentration and with increasing nonsolvent content. The maximum degree of crystallinity is estimated as 8%. The kinetic effects of varying the water content in the solvent mixture are discussed.
Item Type:Article
Copyright:© 1986 Wiley InterScience
Link to this item:http://purl.utwente.nl/publications/70823
Official URL:http://dx.doi.org/10.1002/polb.1986.090240808
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