مرکز منطقه ای اطلاع رساني علوم و فناوري -

چكيده لاتين :

The thermal protection of space crafts during hypersonic re-entry into the Earthיs atmosphere by ablative composite and nanocomposite has been the subject of intensive investigation in recent years. An evaluation has been made on the advantages of relative performances of various ablation materials which is based on the thermal degradation mechanism and thermal stability of these materials. The objective of this work is to investigate the effect of kaolinite nanocrystal on the thermal degradation of resol-type phenolic/asbestos nanocomposite during pyrolysis using thermogravimetric analysis and to compare the results with that of the phenolic/asbestos composite. Thermal degradation and char forming mechanisms could be obtained from parametric adjustments of the process model to the thermogravimetric experimental data. The results of this work are the kinetic parameters of thermal degradation, i.e., the activation energy, frequency factors, and degree of thermal degradation which are employed to clarify the degradation mechanism. INTRODUCTION (.) To whom correspondence to be addressed: E-mail: mehrir@modares.ac.ir The composite materials based on thermoset resins are being increasingly used in aeronautical and aerospace applications such as heat shields. Thermal