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Licensed Unlicensed Requires Authentication Published by De Gruyter March 24, 2022

Optical properties of transparent wood composites prepared using transverse sections of poplar wood

  • Priya Bisht , Krishna K. Pandey EMAIL logo and Srinivas G
From the journal Holzforschung


The revolutionary transformation of opaque wood into a transparent material, with combination of high optical transmittance and high haze, has gained widespread interest in the realms of advanced functional materials. However, the thickness of transparent wood composite (TWC) is limited to a few millimeters which restricts potential use. In this study, TWC were prepared using transverse sections of poplar (Populus deltoides) in thickness ranging from 1.5 to 15 mm by lignin modification bleaching followed by epoxy resin infiltration. The effects of bleaching duration as well as sample thickness on the optical properties of TWC were investigated. TWC was characterized using scanning electron microscopy and FTIR spectroscopy. The optical properties of TWC were measured using UV-VIS-NIR spectroscopy. The results indicated that light transmittance depended on severity of bleaching, lignin content and sample thickness.

Corresponding author: Krishna K. Pandey, Institute of Wood Science and Technology, 18th Cross Malleswaram, Bengaluru 560003, India, E-mail:

Funding source: Department of Science and Technology, New Delhi

Award Identifier / Grant number: DST/INSPIRE Fellowship/[IF190269

Funding source: Indian Council of Forestry Research and Education, Dehradun

Award Identifier / Grant number: IWST/WSP/XI/174


The authors gratefully acknowledge support received from Dr. Harish C. Barshilia, Chief Scientist and Head, Surface Engineering Division, CSIR-National Aerospace Laboratories Bengaluru for useful discussion and his support.

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

  2. Research funding: This work was supported by Indian Council of Forestry Research and Education, Dehradun (grant no. IWST/WSP/XI/174). Priya Bisht expresses her sincere thanks to DST, New Delhi for financial support under DST Inspire fellowship (no. DST/INSPIRE Fellowship/[IF190269].

  3. Conflict of interest statement: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.


Bisht, P., Pandey, K.K., and Barshilia, H.C. (2021). Photostable transparent wood composite functionalized with an UV-absorber. Polym. Degrad. Stabil. 189: 109600. in Google Scholar

Chen, H., Baitenov, A., Li, Y., Vasileva, E., Popov, S., Sychugov, I., Yan, M., and Berglund, L. (2019). Thickness dependence of optical transmittance of transparent wood: chemical modification effects. ACS Appl. Mater. Interfaces 11: 3541–35457. in Google Scholar

Colom, X., Carrillo, F., Nogués, F., and Garriga, P. (2003). Structural analysis of photodegraded wood by means of FTIR spectroscopy. Polym. Degrad. Stabil. 80: 543–549. in Google Scholar

Fink, S. (1992). Transparent wood – a new approach in the functional study of wood structure. Holzforschung 46: 403–408. in Google Scholar

Gan, W., Gao, L., Xiao, S., Zhang, W., Zhan, X., and Li, J. (2017a). Transparent magnetic wood composites based on immobilizing Fe3O4 nanoparticles into a delignified wood template. J. Mater. Sci. 52: 3321–3329. in Google Scholar

Gan, W., Xiao, S., Gao, L., Gao, R., Li, J., and Zhan, X. (2017b). Luminescent and transparent wood composites fabricated by poly(methyl methacrylate) and γ-Fe2O3@YVO4:Eu3+ nanoparticle impregnation. ACS Sustain. Chem. Eng. 5: 3855–3862. in Google Scholar

González, M.G., Cabanelas, J.C., and Baselga, J. (2012). Applications of FTIR on epoxy resins – identification, monitoring the curing process, phase separation and water uptake. In: Infrared spectroscopy – materials science, engineering and Technology. IntechOpen, Rijeka, Croatia, pp. 285–300.10.5772/36323Search in Google Scholar

Kamke, F.A. and Lee, J.N. (2007). Adhesive penetration in wood — a review. Wood Fiber Sci. 39: 205–220.Search in Google Scholar

Lang, A.W., Li, Y., Keersmaecker, M. De, Shen, D.E., Österholm, A.M., Berglund, L., and Reynolds, J.R. (2018). Transparent wood smart windows: polymer electrochromic devices based on poly (3,4-ethylenedioxythiophene): poly (styrene sulfonate) electrodes. ChemSusChem 11: 854–863. in Google Scholar PubMed PubMed Central

Li, H., Guo, X., He, Y., and Zheng, R. (2019a). House model with 2-5 cm thick translucent wood walls and its indoor light performance. Eur. J. Wood Wood Prod. 77: 843–851. in Google Scholar

Li, H., Guo, X., He, Y., and Zheng, R. (2019b). A green steam-modified delignification method to prepare low-lignin delignified wood for thick, large highly transparent wood composites. J. Mater. Res. 36: 932–940. in Google Scholar

Li, T., Zhu, M., Yang, Z., Song, J., Dai, J., Yao, Y., Luo, W., Pastel, G., Yang, B., and Hu, L. (2016). Wood composite as an energy efficient building material: guided sunlight transmittance and effective thermal insulation. Adv. Energy Mater. 6: 1601122. in Google Scholar

Li, Y., Fu, Q., Yu, S., Yan, M., and Berglund, L. (2016). Optically transparent wood from a nanoporous cellulosic template: combining functional and structural performance. Biomacromolecules 17: 1358–1364. in Google Scholar PubMed

Li, Y., Fu, Q., Rojas, R., Yan, M., Lawoko, M., and Berglund, L. (2017a). Lignin-retaining transparent wood. ChemSusChem 10: 3445–3451. in Google Scholar PubMed PubMed Central

Li, Y., Yang, X., Fu, Q., Rojas, R., Yan, M., and Berglund, L. (2017b). Towards centimeter thick transparent wood through interface manipulation. J. Mater. Chem. A 6: 1094–1101.10.1039/C7TA09973HSearch in Google Scholar

Li, Y., Yu, S., Veinot, J.G.C., Linnros, J., Berglund, L., and Sychugov, I. (2017c). Luminescent transparent wood. Adv. Opt. Mater. 5: 1600834. in Google Scholar

Li, Y., Fu, Q., Yang, X., and Berglund, L. (2018). Transparent wood for functional and structural applications. Philos. Trans. R. Soc., A 376: 20170182. in Google Scholar PubMed PubMed Central

Li, Y., Cheng, M., Jungstedt, E., Xu, B., Sun, L., and Berglund, L. (2019). Optically transparent wood substrate for Perovskite solar cells. ACS Sustain. Chem. Eng. 7: 6061–6067. in Google Scholar PubMed PubMed Central

Li, Y., Gu, X., Gao, H., and Li, J. (2020). Photoresponsive wood composite for photoluminescence and ultraviolet absorption. Construct. Build. Mater. 26: 119984. in Google Scholar

Mi, R., Li, T., Dalgo, D., Chen, C., Kuang, Y., He, S., Zhao, X., Xie, W., Gan, W., Zhu, J., et al.. (2020). A clear, strong, and thermally insulated transparent wood for energy efficient windows. Adv. Funct. Mater. 30: 1907511. in Google Scholar

Pan, G.X., Spencer, L., and Leary, G.J. (2000). A comparative study on reactions of hydrogen peroxide and peracetic acid with lignin chromophores. Holzforschung 54: 144–152. in Google Scholar

Pandey, K.K. (2005). Study of the effect of photo-irradiation on the surface chemistry of wood. Polym. Degrad. Stabil. 90: 9–20. in Google Scholar

Pandey, K.K. and Pitman, A.J. (2003). FTIR studies of the changes in wood chemistry following decay by brown-rot and white-rot fungi. Int. Biodeterior. Biodegrad. 52: 151–160. in Google Scholar

Qin, J., Li, X., Shao, Y., Shi, K., Zhao, X., Feng, T., and Hu, Y. (2018). Optimization of delignification process for efficient preparation of transparent wood with high strength and high transmittance. Vacuum 158: 158–165. in Google Scholar

Sadeghifar, H. and Ragauskas, A. (2020). Lignin as a UV light blocker - a review. Polymers 12: 1134. in Google Scholar PubMed PubMed Central

Tappi Press (2001). Standard test method for acid- insoluble lignin in wood. In TAPPI test methods. Tappi Press, pp. 1–2.Search in Google Scholar

Subba Rao, A.N., Nagarajappa, G.B., Nair, S., Chathoth, A.M., and Pandey, K.K. (2019). Flexible transparent wood prepared from poplar veneer and polyvinyl alcohol. Compos. Sci. Technol. 182: 107719. in Google Scholar

Wachter, I., Rantuch, P., Martinka, J., and Pastierov, A. (2021). Effect of UV radiation on optical properties and hardness of transparent wood. Polymers 13: 2067. in Google Scholar PubMed PubMed Central

Wang, X., Zhan, T., Liu, Y., Shi, J., Pan, B., Zhang, Y., Cai, L., and Shi, S.Q. (2018). Large-size transparent wood for energy-saving building applications. ChemSusChem 11: 4086–4093. in Google Scholar PubMed

Wójciak, A., Kasprzyk, H., Sikorska, E., Khmelinskii, I., Krawczyk, A., Oliveira, A.S., Ferreira, L.F.V., and Sikorski, M. (2010). Changes in chromophoric composition of high-yield mechanical pulps due to hydrogen peroxide bleaching under acidic and alkaline conditions. J. Photochem. Photobiol. A Chem. 215: 157–163.10.1016/j.jphotochem.2010.08.005Search in Google Scholar

Wu, Y., Wu, J., Yang, F., Tang, C., and Huang, Q. (2019). Effect of H2O2 bleaching treatment on the properties of finished transparent wood. Polymers 11: 776. in Google Scholar PubMed PubMed Central

Wu, Y., Zhou, J., Yang, F., Wang, Y., Wang, J., and Zhang, J. (2021). A strong multilayered transparent wood with natural wood color and texture. J. Mater. Sci. 56: 8000–8013. in Google Scholar

Wuorimaa, A., Jokela, R., and Aksela, R. (2006). Recent developments in the stabilization of hydrogen peroxide bleaching of pulps: an overview. Nord. Pulp Pap. Res. J. 21: 435–443. in Google Scholar

Yaddanapudi, H.S., Hickerson, N., Saini, S., and Tiwari, A. (2017). Fabrication and characterization of transparent wood for next generation smart building applications. Vaccum 146: 649–654. in Google Scholar

Yan, M., Fu, Q., Yan, M., Jungstedt, E., Yang, X., Li, Y., and Berglund, L.A. (2018). Transparent plywood as a load-bearing and luminescent biocomposite transparent plywood as a load-bearing and luminescent biocomposite. Compos. Sci. Technol. 164: 296–303.10.1016/j.compscitech.2018.06.001Search in Google Scholar

Yu, Z., Yao, Y., Yao, J., Zhang, L., Chen, Z., Gao, Y., and Luo, H. (2017). Transparent wood containing CsxWO3 nanoparticles for heat- shielding-window applications. J. Mater. Chem. A 5: 6019–6024. in Google Scholar

Zhang, H., Fu, S., and Chen, Y. (2020). Basic understanding of the color distinction of lignin and the proper selection of lignin in color-depended utilizations. Int. J. Biol. Macromol. 147: 607–615. in Google Scholar PubMed

Zhu, M., Li, T., Davis, C.S., Yao, Y., Dai, J., Wang, Y., AlQatari, F., Gilman, J.W., and Hu, L. (2016a). Transparent and haze wood composites for highly efficient broadband light management in solar cells. Nano Energy 26: 332–339. in Google Scholar

Zhu, M., Song, J., Li, T., Gong, A., Wang, Y., Dai, J., Yao, Y., Luo, W., Henderson, D., and Hu, L. (2016b). Highly anisotropic, highly transparent wood composites. Adv. Mater. 28: 5181–5187. in Google Scholar PubMed

Received: 2021-12-14
Accepted: 2022-03-06
Published Online: 2022-03-24
Published in Print: 2022-07-26

© 2022 Walter de Gruyter GmbH, Berlin/Boston

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