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Lower critical solution temperature study on cellulose diacetate-acetone solutions

✍ Scribed by H. Suzuki; K. Kamide; M. Saitoh

Publisher: Elsevier Science
Year: 1982
Tongue: English
Weight: 501 KB
Volume: 18
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(82)90188-4

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✦ Synopsis

Cloud points of acetone solutions of four well-fractionated samples of cellulose diacetate (degree of substitution = 2.46) have been measured at elevated temperatures. The molecular weight of the fractions ranged from 3.76 × 104 to 17.5 x 104. The lower critical solution temperature (LCST) was determined as the minimum of each cloud-point curve. The results adequately satisfy the Shultz-Flory relation with OL = 428 K and ~bl. L = -0.94; here Or, is the Flory theta temperature and ~,,~, is the entropy parameter of dilution; subscript L refers to the LCST. The results have been analysed by an equation-of-state theory. The molecular-weight dependence of LCST is compared with the theoretical prediction of Delmas and Patterson, the temperature dependence of the interaction parameter ;(1 being estimated therefrom. Although the absolute predicted values for LCST are low, the equation-of-state parameter obtained suffice to confirm the observation in a previous study that no phase separation occurs at low temperatures.

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