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Combined effect of organosolv delignification/polymerization on the set recovery of densified poplar wood

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Abstract

According to recent literature, delignification could be a new approach to enhance mechanical properties of densified wood. In the present study, the effect of delignification and polymerization, on the physical properties and chemical structure of densified poplar wood was investigated. Wood blocks were delignified with glycerol, in order to keep the hemicelluloses, as an important component in hydrogen and ester bond formation during densification. Afterwards, the delignified blocks were immersed in glycerol-maleic anhydride solution and compressed at 100 °C for 24 h. Results of infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) confirmed the changes in the chemical and morphological structure of delignified wood. Removal of lignin increased hydrogen bonds formation between the adjacent fibers during pressing and reduced the set recovery of the compressed product up to 2%. The set recovery of densified samples was further significantly decreased following surface polymerization with glycerol and maleic anhydride (68% lower than the non-polymerized ones). Combined delignification/polymerization increased the specific tensile strength of densified samples by 37% as compared to non-densified ones.

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Authors and Affiliations

  1. Department of Wood and Cellulosic Products Engineering, Sari Agricultural Sciences and Natural Resources University, Sari, Iran

    Sayed Mohammad Hossein Yahyaee, Foroogh Dastoorian, Maryam Ghorbani & Seyed Majid Zabihzadeh

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  1. Sayed Mohammad Hossein Yahyaee
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  2. Foroogh Dastoorian
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  3. Maryam Ghorbani
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  4. Seyed Majid Zabihzadeh
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Correspondence to Foroogh Dastoorian.

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Yahyaee, S.M.H., Dastoorian, F., Ghorbani, M. et al. Combined effect of organosolv delignification/polymerization on the set recovery of densified poplar wood. Eur. J. Wood Prod. 80, 367–375 (2022). https://doi.org/10.1007/s00107-021-01756-5

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  • DOI: https://doi.org/10.1007/s00107-021-01756-5

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