In this study, we provide a novel study on improving wood stability, mechanical, and bio-preservative properties of nanohybrid biopolymers - impregnated tropical fast-growing tree woods. The woods are mostly composed by juvenile wood with inferior properties for both structural and non-structural objectives. Prior the impregnation, chitosan nanoparticles are isolated from speckled swimming crab shells by means of deacetylation of chitin nanofibers and mechanical disintegration with 10-80 nm in width1 whereas crystalline nanocellulose is isolated from wood flour wastes by means of acid hydrolysis and ultrasonication with the average thickness of 1–3.5 nm2.
To attain superior properties, nanohybrid biopolymers for chitosan nanoparticles and crystalline nanocellulose with a ratio of 10:1 are mixed, and impregnated in six-year-old fast growing tree woods using a vacuum at 20 atm for 60 min, and followed with 2 h at 2.5 bar pressure. Functional nanohybrid polymer solution derived from chitosan nanoparticles, cationic chitosan, cellulose nanocrystal, and glycidoxypropyltrimethoxysilane were prepared and subsequently modified with PFSOF3. The impregnated woods are then coated with the functional perfluorinated solution. Resultant impregnated woods are investigated their wood stability, self-cleaning, mechanical, and bio-preservative properties. Impregnated woods, which are functionally perfluorinated had lotus effect3,4 with a water contact angle (CA) above 150° and CA hysterisis of less than 10°. Due to the nature, the woods have good self-cleaning properties, stability, and durability against high humidity and water leaching5. Wood stability and bio-preservative nature against bacteria, fungi, moulds, and termites can be enhanced with the inclusion of nanohybrid biopolymers of chitosan nanoparticles and cellulose nanocrystal3,6,7. These enhanced properties of the woods will be applicable for both luxurious structural and non-structural building application.
1. Lin, M.-C., Wu, Q. Song, K., Cheng, H.N., Suzuki, S., Lei, T. ACS Sustainable Chem. Eng. 4, 4385-4395 (2016).
2. Fahma, F., Iwamoto, S., Hori, N., Iwata, T., Takemura, A. Cellulose 17, 977–985 (2010).
3. Song, K., Gao, A., Cheng, X., Xie, K. Carbohydr. Polym. 130, 381-387 (2015).
4. de Francisco, R., Tiemblo, P., Hoyos, M., Arellano, C.G., Garcia, N., Berglund, L., Synytska, A. ACS Appl. Mater. Interfaces 6, 18998-19010 (2014).
5. Verho, T., Bower, C., Andrew, P., Franssila, S., Ikkala, O., Ras, R.H.A. Adv. Mater. 23, 673-678 (2010).
6. Panek, M., Reinprecht, L., Hulla, M. BioResources, 9, 5588-5603 (2014).
7. Raji, O., Telmadarrehei, T., Tang, J.D., Jeremic, D. Proceedings of the Canadian Wood Preservation, 128-136 (2015)
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