著者

師岡 淳郎 則元 京

出版者

社団法人 繊維学会

雑誌

繊維学会誌 (ISSN:00379875)

巻号頁・発行日

vol.47, no.7, pp.328-333, 1991

被引用文献数

4

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In accordance with the newly developed homogeneous periodate oxidation procedure, we prepared high cleavage level 2, 3-dialcohol cellulose (DAC) which gives off a clear and transparent film. Viscoelastic properties of DAC were investigated in relation to those of cellulose. Dynamic mechanical measurements for DAC at 110Hz over the temperature range from -150°C to 150°C revealed two kinds of relaxation processes, which were respectively centered around -70°C and 112°C. The first process at -70°C was related to dielectric relaxion, and was regarded to be, similar to the process in cellulose, due to the motion of methylol groups. On the other hand, the cleavage of C₂-C₃ bonds of the glucopyranose ring resulted in the process at around 112°C, while no comparable process has been reported for cellulose in the similar region. This process was ascribed to the micro- Brownian motion along the main chain. From the temperature variation of the stress-elongation diagrams, the glass transition temperature Tg for DAC was estimated to be about 80°C. The DAC film above Tg showed a marked elongation reaching 200% at 112°C.