<Original>Viscoelastic Properties of Cellulose Acylates

概要

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この論文は国立情報学研究所の学術雑誌公開支援事業により電子化されました。Five kinds of cellulose acylates from propionate to caprate were prepared by trifluoro acetic anhydride-fatty acid esterification. The temperature variations of dynamic modulus, loss modulus and loss tangent for these acylates were measured at four frequencies of 3.5, 11, 35 and 110 Hz in the temperature range from -190℃ to 200℃. Four types of relaxation process were observed for the acylates from butyrate to caproate, being labelled a, β, β' and f in order of decreasing temperature at which they were detected. However, the γ process for propionate and the β' process for caprate were not observed. On the contrary, a relaxation process, labelled γ', for propionate was detected. These a to γ' processes were respectively attributed to; micro-Brownian motion (a), motion of the side chain (β and β'), motion initiated by three or more methylene groups (γ), and motion of two methylene groups (γ').
1983-03-25