Wood Property Improvement of Siberian Pine by Combination of Boric Acid Impregnation and In-Situ Polymerization of Ԑ-Caprolactone

Year 2019, , 157 - 161, 01.03.2019

Mahmut Ali Ermeydan , Eylem Dizman Tomak Zeynep Nur Kartal

https://doi.org/10.2339/politeknik.386966

Cited By: 1

Abstract

Wood is an excellent engineering material with its
light weight and high mechanical properties. However, it is susceptible to
biodegradation due to its hygroscopic nature and chemical composition that
limits both its indoor and outdoor usage. Boron compounds which are known as
eco-friendly wood preservatives have limited utility at outdoor conditions
since they are easily leached out from wood by water. The aim of this study is
to prevent boron leaching by creating a polymer network that encapsulates boron
compound inside the wood cell walls, thus decay resistance, dimensional
stability and water repellence are improved. In the study, Siberian pine
samples were impregnated with 1% boric acid in DMF(N,N-Dimethylformamide) and
further ε-caprolactone monomer (1% SnOct2 as initiator) mixture for further
in-situ polymerization were carried out in the oven at 150°C for 3 hours. Prior
to decay testing, leaching test was conducted in order to evaluate any loss in
effectiveness in decay resistance against to C. puteana and C. versicolor
attack due to possibility of boron leaching from wood. The results showed that
leached samples had lower weight loss than unleached samples after C. puteana
attack, however, the weight loss by C. versicolor attack increased in leached samples.
Decay resistance of treated samples was found to be 7-99% in comparison with
references. Boric acid and polymer combination increased dimensional stability
(25% ASE), and water repellence (15%) of wood compared to references without
deformation. This method showed that curing may be an alternative for wood
modification with in-situ polycaprolactone polymerization in order to use
hazardous solvent media for polymerization. 

Keywords

Poly(ε-caprolactone), wood modification, dimensional stability, decay resistance

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