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Ganguly, Sauradipta; Hom, Sanjeet Kumar; Sharma, Varun; Samani, Ajmal
Drvna industrija, 03/2024, Volume: 75, Issue: 1Journal Article
The fast-growing species of Populus deltoides is of significant commercial importance to the Indian wood merchants. Despite its abundant availability and better treatability, the use of P. deltoides is limited due to its perishable nature. Heat treated and chemically modified Populus deltoides L. was thus explored for dimensional stability and biological durability to commercialise its use. Chemical modification was performed using a combination of citric acid and sodium hypophosphite. Heat treatment was done in a laboratory oven in air at 140 °C for 8h. Both chemically modified and heat-treated samples exhibited improvements in dimensional stability and biological durability in comparison to the untreated control sets. Chemical modification resulted in better dimensional stability. Anti-swelling efficiency of Populus deltoides was 2-2.5 times more for the chemically modified set compared to heat treatment in both radial and tangential directions. Chemically modified set became significantly more resistant to biodeterioration showing 5 times less mass loss by termites, whereas controls and heat-treated sets returned loss percentages which were comparable. Soil block bioassay with Trametes versicolor (TV) exhibited mass loss of 9.46 % for chemically modified samples, 40.26 % for heat treated samples and 50.02 % for the untreated controls, respectively. Rhodonia placenta (OP) followed a similar trend with mass loss of chemically modified set being 5.72 % and heat-treated set being 37 %, respectively, with the controls showing 43.85 % mass loss. Mass loss exhibited by the heat-treated samples were less than the controls, but the values suggested that heat treatment at 140 °C for 8 h failed to impart any substantial resistance against rotting fungi and termites. Brzorastuća vrsta Populus deltoides ima veliku komercijalnu važnost za indijske trgovce drvom. Unatoč velikoj dostupnosti i dobroj obradivosti, upotreba drva P. deltoides ograničena je zbog njegove slabe trajnosti. Stoga je radi bolje komercijalizacije drva Populus deltoides L. istražen utjecaj toplinske i kemijske modifikacije na njegovu dimenzijsku stabilnost i biološku trajnost. Kemijska modifikacija provedena je kombinacijom limunske kiseline i natrijeva hipofosfita. Toplinska modifikacija u trajanju od osam sati obavljena je u laboratorijskom sušioniku pri 140 °C, uz prisutnost zraka. Kemijski i toplinski modificirani uzorci drva pokazali su bolju dimenzijsku stabilnost i biološku trajnost od nemodificiranih kontrolnih uzoraka. Kemijska modifikacija rezultirala je i većom dimenzijskom stabilnošću. Učinkovitost u sprečavanju bubrenja drva Populus deltoides bila je 2 – 2,5 puta veća u kemijski modificiranih uzoraka nego u toplinski modificiranih uzoraka, i to u radijalnome i tangencijalnom smjeru. Kemijski modificirani uzorci drva postali su znatno otporniji na biološko propadanje i pokazali su pet puta manji gubitak mase pri djelovanju termita nego toplinski modificirani i nemodificirani uzorci. Test s Trametes versicolor (TV) pokazao je gubitak mase od 9,46 % za kemijski modificirane uzorke, 40,26 % za toplinski modificirane uzorke i 50,02 % za nemodificirane uzorke. Za test s Rhodonia placenta (OP) uočen je sličan trend gubitka mase, koji je za kemijski modificirane uzorke iznosio 5,72 %, za toplinski modificirane uzorke 37 %, a za nemodificirane uzorke 43,85 %. Gubitak mase toplinski modificiranih uzoraka drva bio je manji od gubitka mase nemodificiranih uzoraka, ali su vrijednosti pokazale da se toplinskom modifikacijom pri 140 °C tijekom osam sati nije uspjela postići značajna otpornost protiv gljiva truležnica i termita.
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