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Abstract  

The accelerated thermal degradation of low-density polyethylene (LDPE) was studied in air at atmospheric pressure and temperatures of 70, 80, 90 and 100C. The changes in elongation at break, traction resistance and density as a result of accelerated thermooxidative degradation were followed. Thermal analysis curves (TG, DTG and DTA) of non-aged and thermally aged LDPE were recorded, and the thermal analysis results were compared with those relating to the variations in the elongation at break, the traction resistance and the density as a consequence of accelerated thermal aging.

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Abstract  

To reveal the fire injuring of parchment, the changes in the thermal behaviour of some goat parchments, obtained from skins originating from different animals, as a result of thermal aging were determined by thermal analysis methods (DSC; simultaneous TG/DTG, DSC; micro hot table (MHT)). Thermal aging of parchments was revealed to bring about the decrease in shrinkage temperature, absolute value of enthalpy of denaturation in water and some changes in non-isothermal parameters characteristic for dehydration process in static air atmosphere. The results obtained by DSC analysis performed in N2 and O2 flows as well as those obtained by simultaneous TG/DTG, DSC analyses have shown that both softening (melting) process parameters and parameters of thermo-oxidative processes have not been changed by thermal ageing. The results obtained by thermal analysis methods were correlated with those obtained by microscopic investigation of parchment samples immersed in water and scanning electron microscopy (SEM). The application of these microscopic techniques has revealed the morphology changes in the investigated parchments as a result of thermal degradation.

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historical leathers and parchments . J Cult Herit 9 : 146 – 153 10.1016/j.culher.2007.10.001 . 31. Budrugeac , P , Miu , L 2008 Effect of accelerated thermal ageing on the thermal behaviour

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Journal of Thermal Analysis and Calorimetry
Authors: M. Prochon, G. Janowska, A. Przepiorkowska, and A. Kucharska-Jastrzabek

can facilitate the cross-linking processes but also can increase the resistance of the elastomeric materials to accelerated thermal aging. The presence of 15% of nitrogen in keratin ( Table 1 )—an element belonging to the group of flame

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. 2. Budrugeac , P , Miui , L . Effect of accelerated thermal ageing on the thermal behaviour of the recently made parchments . J Therm Anal Calorim . 2008 ; 94 : 2 335 – 342 . 10.1007/s10973

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, P , Miu , L . Effect of accelerated thermal ageing on the thermal behaviour of the recently made parchments . J Therm Anal Calorim . 2008 ; 94 : 342 – 355 . 10.1007/s10973-008-9103-2 . 39

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