Session: General Poster:

Continuous steam explosion was applied to preprocess microcrystalline cellulose(MCC), and then changes in crystalline structure of MCC were studied. All samples preprocessed showed a typical cellulose I crystal structure by XRD (Figure). However, the degrees of crystalline (Xc) of all samples preprocessed decreased, compared with raw MCC. The band of all samples preprocessed around at 3414 cm^-1, assigned to -OH stretching vibrations, was sharper and narrower than the band of raw MCC. Moreover, the bands were resolved into three peaks by Gaussian function[1], these were at 3551 cm^-1, 3350 cm^-1 and 3164 cm^-1, assigned to the intramolecular hydrogen bond of 2-OH…O-6, intramolecular hydrogen bond of 3-OH…O-5 and the intermolecular hydrogen bond of 6-O…HO-3’, respectively[1]. These three bands of samples preprocessed had red shift, which indicated that the hydrogen-bonding network of MCC changed after the preprocessing.

Figure. XRD patterns of raw MCC, B(steam explosion frequency: 30 Hz, feeding modes: one-time feeding, and steam explosion times: once), C(steam explosion frequency: 40 Hz, feeding modes: continuous and uniform feeding, and steam explosion times: once), D(steam explosion frequency: 40 Hz, feeding modes: two-time feeding, and steam explosion times: twice), and E(steam explosion frequency: 40 Hz, feeding modes: one-time feeding, and steam explosion times: once)

Figure. XRD patterns of raw MCC, B(steam explosion frequency: 30 Hz, feeding modes: one-time feeding, and steam explosion times: once), C(steam explosion frequency: 40 Hz, feeding modes: continuous and uniform feeding, and steam explosion times: once), D(steam explosion frequency: 40 Hz, feeding modes: two-time feeding, and steam explosion times: twice), and E(steam explosion frequency: 40 Hz, feeding modes: one-time feeding, and steam explosion times: once)

Jian Xiong

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