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Erschienen in: Wood Science and Technology 5/2022

02.09.2022 | Original

Improvement in hygroscopicity and dimensional stability of bamboo through a synthetic modification of maleic anhydride with tung oil heat treatment

verfasst von: Luxi He, Tianfang Zhang, Xiangyu Zhao, Jingjing Gao, Zhengbin He, Songlin Yi

Erschienen in: Wood Science and Technology | Ausgabe 5/2022

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Abstract

Bamboo is known to be a sustainable material with fast growth and high mechanical properties, while the high hygroscopicity and low-dimensional stability limit its further utilization in the construction sector. Thus, a novel dual modification method combining maleic anhydride and tung oil heat treatment was firstly applied to bamboo, and an orthogonal experiment was designed to investigate the influence of the processing parameter on the physical properties of bamboo, including weight change rate (WCR), moisture excluding efficiency (MEE) and anti-swelling efficiency (ASE). Furthermore, the morphological characteristics, chemical structure and water status of modified bamboo were also studied. The results showed that a parameter combination of maleic anhydride pretreatment at 80 °C for 3 h and tung oil heat treatment at 140 °C for 3 h was considered as an optimized process. The MEE and ASE (volume) of the modified bamboo could reach approximately 80 and 60%, respectively. Maleic anhydride was deposited on the cell wall and the reaction sites were grafted onto the bamboo by esterification. A portion of tung oil could be impregnated into the bamboo and occluded the water channel, such as vessels and pits, and the chemical linkage between the modified bamboo and tung oil was then established during heat treatment through the Diels–Alder reaction. Additionally, the dual modification method not only changed the water distribution of bamboo, but also shortened the spin–spin relaxation time (T2) of the bound water and free water.

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Literatur
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Zurück zum Zitat Thygesen LG, Elder T (2008) Moisture in untreated, a cetylated, and furfurylated Norway spruce studied during drying using time domain NMR. Wood Fiber Sci 40:309–320 Thygesen LG, Elder T (2008) Moisture in untreated, a cetylated, and furfurylated Norway spruce studied during drying using time domain NMR. Wood Fiber Sci 40:309–320
Metadaten
Titel
Improvement in hygroscopicity and dimensional stability of bamboo through a synthetic modification of maleic anhydride with tung oil heat treatment
verfasst von
Luxi He
Tianfang Zhang
Xiangyu Zhao
Jingjing Gao
Zhengbin He
Songlin Yi
Publikationsdatum
02.09.2022
Verlag
Springer Berlin Heidelberg
Erschienen in
Wood Science and Technology / Ausgabe 5/2022
Print ISSN: 0043-7719
Elektronische ISSN: 1432-5225
DOI
https://doi.org/10.1007/s00226-022-01410-0

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