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Licensed Unlicensed Requires Authentication Published by De Gruyter January 13, 2020

Hygrothermal recovery of compression wood in relation to DMSO swelling and drying shrinkage

  • Shuoye Chen ORCID logo EMAIL logo , Miyuki Matsuo-Ueda ORCID logo , Masato Yoshida ORCID logo and Hiroyuki Yamamoto ORCID logo EMAIL logo
From the journal Holzforschung


To understand the irreversible dimensional changes caused by hygrothermal treatment of green wood, i.e. hygrothermal recovery (HTR), green hinoki compression wood (CW) and normal wood (NW) were hygrothermally (HT) treated in water at 100°C for 120 min and their HTR strains were determined. The specimens were then swollen using dimethyl sulfoxide (DMSO) and then completely dried after solvent exchange with water at room temperature. Their HTR strains were then compared with their DMSO swelling and drying shrinkage strains. The volumetric HTR strains in the CW were about twice as large as those in the NW. Moreover, the microfibril angle (MFA) was found to be an important factor for controlling the HTR intensity. A clear commonality between the HTR behavior and both DMSO swelling and drying shrinkage behavior was identified, which indicates that HTR is caused by volumetric changes in the matrix substances. HTR has been defined as a phenomenon due to the release of locked-in growth stress when a wood specimen is HT treated. To determine whether DMSO treatment has a similar effect as hygrothermal treatment, both HT-untreated and HT-treated specimens were swollen using DMSO, and their dimensional changes during and after DMSO treatment were compared. The results showed that DMSO treatment is a possible alternative for releasing the locked-in growth stress.


The authors would like to thank Associate Professor Eiichi Obataya, University of Tsukuba, for his discussion of this study. The authors would also like to thank Mr. Naoki Takabe and Mr. Norio Yamaguchi, Experimental Forest of Nagoya University, for their help in harvesting the hinoki tree. The authors express their appreciation for the Radioisotope Research Center, Nagoya University, for providing the X-ray diffractometer for the MFA measurements.

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: None declared.

  3. Employment or leadership: None declared.

  4. Honorarium: None declared.

  5. Conflict of interest statement: The authors declare no conflict of interest regarding the content of this article.


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Received: 2019-06-12
Accepted: 2019-11-15
Published Online: 2020-01-13
Published in Print: 2020-08-27

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