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Official Journal of the Japan Wood Research Society

Mechanical relaxation processes due to sugars in cane (Arundo donax L.)


The storage modulus and the mechanical loss tangent of untreated, extracted, and sugar- impregnated canes (Arundo donax L.) were measured over a temperature range of −150° to 0°C at low frequencies. Two relaxation processes, labeled α and β, were detected in the ranges −60° to 0°C and −120° to −100°C, respectively. The α and β processes shifted to lower temperatures with increasing moisture content. The α process was detected only in the canes containing sugar. The magnitude of its loss peak increased with an increase in sugar content. It was speculated that the α process was due to some interactive molecular motions of the adsorbed water and sugar. The β process, detected in all of the canes, was attributed to the motion of the adsorbed water in the amorphous cell wall substances.


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Correspondence to Eiichi Obataya.

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Obataya, E., Norimoto, M. Mechanical relaxation processes due to sugars in cane (Arundo donax L.). J Wood Sci 45, 378–383 (1999).

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Key words

  • Relaxation process
  • Arundo donax
  • Storage modulus
  • Loss tangent
  • Extractives