Volume 61 Issue 2 (2011) - Годишник на ТУ - София - Технически ...

Change of Mass M, %100-10-20-30-40-50-60TGIP12345Rate of Loss of Mass ΔM/ΔT, %/ 0 C0.2 0 100 200 300 400 500 600 7000-0.2-0.4-0.6-0.8DTG322350411365347Temperature T, 0 Cb)Fig. 2. Thermal analysis – TGA (a) and DTGA (b) spectra, of bare Douglas fir wood (1), flame retardedwood by capillary FRIS impregnation with 2 vol. % of anionic surfactant (2) and flame retarded wood byplasma-aided capillary impregnation at different operating rate of DBD pre-treatment: 3 – low frequency(50 Hz) DBD at 10 kV; 4 - low frequency (50 Hz) DBD at 15 kV, and 5 - high frequency (10 kHz) DBD at10 kV (at 50 0 C/min).Relative (Compared to Sample 1) Change of Mass-70-80200150100500-50-100-150-2000 200 400 600 800 1000 1200426430Temperature T, 0 C0100Zone A150200150215IPRTGFig. 3. Thermal analysis – TGA spectra, or relative change of mass obtained in comparison with the bareDouglas fir wood, of bare Douglas fir wood (1), flame retarded wood by capillary FRIS impregnation with2 vol. % of anionic surfactant (2) and flame retarded wood by plasma-aided capillary impregnation at differentoperating rate of DBD pre-treatment: 3 – low frequency (50 Hz) DBD at 10 kV; 4 - low frequency(50 Hz) DBD at 15 kV, and 5 - high frequency (10 kHz) DBD at 10 kV (at 50 0 C/min).300Zone B372376Zone A387379400 500 600426430Zone A2345a)Temperature T, 0 C89