Abstract
For the cellulose crystals I and II, the spacings and intensities of some typical X-ray reflections were measured over a range of temperature from room temperature to 200°C. The spacing vs. temperature curve for each reflection exhibited a distinct break at about 150°C for Cell I and at about 100°C for Cell II. The thermal expansion coefficients estimated from this curve for the (101) reflection of Cell I were 5.1×10−5 K−1 below 150°C and 1.6×10−4 K−1 above 150°C. The intensity vs. temperature curve for each reflection also exhibited a break at the same temperature as that for the break of the corresponding spacing vs. temperature curve. The reason for the appearance of these breaks is not yet clear.
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Takahashi, M., Takenaka, H. X-Ray Study of Thermal Expansion and Transition of Crystalline Cellulose. Polym J 14, 675–679 (1982). https://doi.org/10.1295/polymj.14.675
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DOI: https://doi.org/10.1295/polymj.14.675
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