Rantuch, Peter, 1985- Vplyv rýchlosti ohrevu na termický rozklad izolácie z drevovláknitej hmoty = The influence of the heat rate to thermal decomposition of wood fibre insulation / Peter Rantuch ...[et al.]. -- Obr., tab. -- Lit. - In terms of fire safety, it is necessary to understand the behaviour of insulation materials during thermal load, as they are widely used in the building industry. Samples of wood fibreboard insulation with weight between 1,002 g and 1,006 g were heat stressed by four heating rates: 1,78 °C×min−1; 3,68 °C×min−1; 7,60 °C×min−1 and 11,27 °C×min−1. The test took place in a hot air furnace in air atmosphere. By means of thermogravimetric analysis, a temperature range of thermooxidation of the samples was characterized and subsequently the corresponding activation energy was calculated. The measured results showed two marked stages of thermal degradation in the temperature range from 215 °C to 345 °C and from 335 °C to 520 °C. The course of slowly heated samples differed from quick heated samples. The maximum mass loss rate occurred during the first stage of decomposition. The activation energies were calculated by three different methods. Similar dependences of activation energy on conversion were acquired using calculations according to Kissinger-Ahahira-Sunose and Flynn-Wall-Ozawa, however the values determined by the first of the mentioned methods were slightly lower. By means of Kissinger method, only activation energy related to the area of maximum mass loss rate was determined. The average values of the activation energy of the first stage reaction ranged from 97,1 kJ×mol−1 to 101,4 kJ×mol−1. - Drevovláknitá izolácia má podobne ako iné lignocelulózové materiály dva výrazné stupne termickej degradácie. V prípade vzoriek zahrievaných rýchlosťami 1,78 °C×min−1 a 3,68 °C×min−1 nastávala prvá fáza rozkladu pri teplotách 215 °C – 335 °C a druhá fáze medzi 385 °C – 425 °C. Pri rýchlostiach ohrevu 7,60 °C.min-1 a 11,27 °C.min-1 na seba obe fázy nadväzovali, pričom boli pozorované v rozsahu 235 °C – 345 °C, resp. 335 °C – 0 20 40 60 80 100 120 140 0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 Aktivačná energia (kJ/mol) Konverzia Kissinger Flynn-Wall-Ozawa Kissinger-Akahira-Sunose 106 520 °C. Maximálne rýchlosti hmotnostného úbytku nastávali v priebehu prvého stupňa rozkladu, pričom sa ich hodnoty s rastúcou rýchlosťou ohrevu zvyšovali.

In Acta Facultatis Xylologiae Zvolen : vedecký časopis Drevárskej fakulty. -- Zvolen : Technická univerzita vo Zvolene, 2014. -- ISSN 1336-3824. -- Roč. 56, č. 1 (2014), s. 97-108

I. Kačíková, Danica, 1964-
II. Martinka, Jozef, 1983-
III. Balog, Karol, 1949-
IV. Acta Facultatis Xylologiae Zvolen : vedecký časopis Drevárskej fakulty. -- Roč. 56, č. 1 (2014), s. 97-108
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