Probing Chemical Changes in Holocellulose and Lignin of Timbers in Ancient Buildings

Zhao, Chengcheng and Zhang, Xiaochun and Liu, Lina and Yu, Youming and Zheng, Wei and Song, Pingan ORCID: https://orcid.org/0000-0003-1082-652X (2019) Probing Chemical Changes in Holocellulose and Lignin of Timbers in Ancient Buildings. Polymers, 11 (5):809. pp. 1-13. ISSN 2073-4360

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Abstract

Wooden structures in China’s ancient buildings hold highly historical and cultural values. There is an urgent need to repair and replace the damaged wooden structures after hundreds and thousands of years of exposure to weather. Unfortunately, to date there is still a lack of insightful understanding on how the chemical structure, composition, and micro-morphology evolve over the long-term natural aging before artificial ancient timbers can be developed. This work aims to systematically examine the outer surface, middle layer, and inner surface of the same piece of Chinese fir (Cunninghamia lanceolate) collected from an ancient Chinese building. Based on qualitative and quantitative analysis, both cellulose and hemicellulose in aged woods are found to experience significant degrees of degradation. The crystalline regions of cellulose are also determined to undergo moderate degradation as compared to the control fresh wood. In comparison, the lignin basically remains unchanged and its content in the inner layer slightly increases, as evidenced by more free phenol groups determined. Relative to the outer and inner layer, the middle layer of the ancient wood shows the lowest degree of degradation close to that of the fresh wood. This work offers guidelines for fabricating artificial ancient woods to repair the destroyed ones in China’s ancient architectures.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 22 Jan 2021 03:44
Last Modified: 01 Feb 2021 01:01
Uncontrolled Keywords: aged timbers; ancient building; chemical analysis; structure evolution; morphology
Fields of Research (2008): 09 Engineering > 0904 Chemical Engineering > 090499 Chemical Engineering not elsewhere classified
09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
09 Engineering > 0904 Chemical Engineering > 090402 Catalytic Process Engineering
Fields of Research (2020): 40 ENGINEERING > 4005 Civil engineering > 400511 Timber engineering
40 ENGINEERING > 4004 Chemical engineering > 400499 Chemical engineering not elsewhere classified
40 ENGINEERING > 4005 Civil engineering > 400505 Construction materials
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
E Expanding Knowledge > 97 Expanding Knowledge > 970103 Expanding Knowledge in the Chemical Sciences
Socio-Economic Objectives (2020): 24 MANUFACTURING > 2406 Environmentally sustainable manufacturing activities > 240699 Environmentally sustainable manufacturing activities not elsewhere classified
24 MANUFACTURING > 2417 Wood, wood products and paper > 241799 Wood, wood products and paper not elsewhere classified
24 MANUFACTURING > 2417 Wood, wood products and paper > 241704 Wood products
Identification Number or DOI: https://doi.org/10.3390/polym11050809
URI: http://eprints.usq.edu.au/id/eprint/40566

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