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Effect of Si–Al molar ratio on microstructure and mechanical properties of ultra-low density fiberboard

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Abstract

Si–Al compounds represent the substances having silicium (Si) and aluminum (Al) in the mixed aqueous solution of sodium silicate and aluminum silicate. Their chemical structure depends on Si–Al molar ratio. In this study, several Si–Al molar ratios were used to prepare different Si–Al compounds. These Si–Al compounds were added in the manufacturing process of ultra-low density fiberboards (ULDFs) to examine the effects of Si–Al molar ratio on the microstructure and the mechanical properties of ULDFs. Scanning electron microscope-energy dispersive spectroscopy, X-ray photoelectron spectrometer, infrared spectrometer, X-ray diffractometer and electronic universal testing machine were used to analyze the microstructure and mechanical properties of ULDFs. The results showed that the microstructure and bulk density of ULDFs were affected by Si–Al molar ratios. The mechanical properties of ULDFs were also significantly affected because of Si and Al components being uniformly distributed on the fibers’ surface and formation of Si–O–C bond. When Si–Al molar ratio was 2:1, the modulus of elasticity, modulus of rupture and internal bond strength of the ULDF was up to 20.78, 0.17, and 0.025 MPa, respectively.

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Acknowledgments

This paper is supported by the Scientific Research Foundation of Graduate School of Fujian Agriculture and Forestry University (1122YB020) and the Studying Abroad Scholarships of China. The authors are also grateful for the financial support of the National Science and Technology Support Program (2008BADA9B01) and the National Natural Science Foundation of China (NSFC) (30781982).

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Authors and Affiliations

  1. College of Material Engineering, Fujian Agriculture and Forestry University, Jinshan, Fuzhou, Fujian, 350002, People’s Republic of China

    Tingjie Chen, Zhenzeng Wu, Min Niu & Yongqun Xie

  2. Division of Wood Products Engineering, Luleå University of Technology, Forskargatan 1, 93187, Skellefteå, Sweden

    Tingjie Chen & Xiaodong Wang

Authors
  1. Tingjie Chen
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  2. Zhenzeng Wu
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  3. Min Niu
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  4. Yongqun Xie
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  5. Xiaodong Wang
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Correspondence to Yongqun Xie.

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Chen, T., Wu, Z., Niu, M. et al. Effect of Si–Al molar ratio on microstructure and mechanical properties of ultra-low density fiberboard. Eur. J. Wood Prod. 74, 151–160 (2016). https://doi.org/10.1007/s00107-015-0986-x

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  • DOI: https://doi.org/10.1007/s00107-015-0986-x

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