Welcome to Chemistry and Industry of Forest Products,

›› 2008, Vol. 28 ›› Issue (6): 61-66.

• 研究报告 • Previous Articles     Next Articles


LIU De-tao1,2, LI Jun2, SUN Yong3, CHEN Ke-fu2   

  1. 1. Industrial Technology Research Institute, South China University of Technology, Guangzhou 510640, China;2. Guangdong Public Laboratory of Paper Technology and Equipment, South China University of Technology, Guangzhou 510640, China;3. School Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
  • Received:2007-12-26 Revised:1900-01-01 Online:2008-12-30 Published:2008-12-30

Abstract: Physico-chemical characteristics of steam-degraded products collected from pine-wood fiber/MPU-20 resin(polyurethanes)composites by self-designed steam injection technology and equipments were studied by experimental observation, pH value determination, FT-IR and UV-Vis spectrometries. The surfaces of wood fibers were also invesitigated by SEM microscopy during steam injection treatment. The results indicated that steam-degraded products are acidic, the pH value of which was influenced by steam pressure, injection time and retention time. FT-IR spectrum showed that steam-degraded products consist mainly of a polyoses mixture, and the produced deposites are mainly resin mixture which are structurally similar to phenol-rosin resin. SEM microscopy clearly showed some significant groove marks and sockets on the surfaces of pine wood fiber after steam injection treatment. UV-Vis spectrum suggested that acidic degraded intermediate pigments with unsaturated conjugates were probably produced from the composites by steam injection treatment. In addition, lignin molecules were also degraded or/and resolved. The compared absorbance peaks of lignin compounds showed that resin in cellulose-based composite probably reacts or combines with lignin molecules.

Key words: steam injection, cellulose-based composite, degradation, physico-chemical characteristics

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