engleski

Citric Acid - Promising Agent for Increased Biological Effectivenes of Wood

Obtained results in improving biological durability of pine (Pinus sylvestris L.) sapwood by modification with citric acid (CA) as a representative of polycarboxylic acids are presented in this paper. Modification was performed by impregnation with 7, 0 % water dilution of CA and 6, 5 % sodium-hypophosphite monohydrate (SHP) followed with curing at 140 °C for 10 hours. The contribution of citric acid ester linkages was monitored with FTIR. In addition, the influence of solely thermal treatment onto durability was investigated. According to EN 113, modified and control specimens were exposed to the fungi Gloeophyllum trabeum and Trametes versicolor. Results have proved significant improvement of CA modified wood in a case of G. trabeum, while thermal treatment didn’ t have considerable influence on biological effectiveness. Chemical modification with CA showed tendency toward increasing the wood durability and as such offers promising environmentally friendly method.

Chemical modification of wood; Citric acid; FTIR analyses; wood durability; Gloeophyllum trabeum (Pers.: Fr.); Trametes versicolor (L.: Fr.) Pilat.

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