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Rheological investigations of a polymeric precursor for ceramic materials: experiments and theoretical modeling

Balan, C. and Riedel, R. (2012):
Rheological investigations of a polymeric precursor for ceramic materials: experiments and theoretical modeling.
In: JOURNAL OF OPTOELECTRONICS AND ADVANCED MATERIALS, 8 (2), NATL INST OPTOELECTRONICS, 1 ATOMISTILOR ST, PO BOX MG-5, BUCHAREST-MAGURELE 76900, ROMANIA, pp. 561-567, ISSN 1454-4164,
[Article]

Abstract

The paper is concerned with the rheological investigation of a commercial polysiloxane of the form [CH3-SiO3/2](x) which has potential application as precursor for the synthesis of silicon oxycarbide ceramics. The cross-linking reaction of pre-ceramic polymers in the presence of catalyst and/or fillers is one of the key steps in the successful polymer-to-ceramic transformation process. During the proceeding cross-linking reaction, a fast change of the polymer rheology is observed. The route of time-temperature variation for elasticity and viscosity of the samples is of great importance for the final properties of the resulting ceramic material. Dynamic test at constant oscillatory frequency and different constant temperatures or temperature gradients have been performed in order to establish the time evolution of the elastic and viscous moduli, as a function of the catalyst and filler concentration. The experimental data are modelled with a novel constitutive relation which is able to reproduce the rheology of isothermal and non-isothermal cross-linking processes as a function of the reaction time. The qualitative agreement between experiments and numerical simulations of the process is obtained for all the tests. The results of the present study indicate the value of rheological measurements to determine the thermomechanical properties of pre-ceramic polymers.

Item Type: Article
Erschienen: 2012
Creators: Balan, C. and Riedel, R.
Title: Rheological investigations of a polymeric precursor for ceramic materials: experiments and theoretical modeling
Language: English
Abstract:

The paper is concerned with the rheological investigation of a commercial polysiloxane of the form [CH3-SiO3/2](x) which has potential application as precursor for the synthesis of silicon oxycarbide ceramics. The cross-linking reaction of pre-ceramic polymers in the presence of catalyst and/or fillers is one of the key steps in the successful polymer-to-ceramic transformation process. During the proceeding cross-linking reaction, a fast change of the polymer rheology is observed. The route of time-temperature variation for elasticity and viscosity of the samples is of great importance for the final properties of the resulting ceramic material. Dynamic test at constant oscillatory frequency and different constant temperatures or temperature gradients have been performed in order to establish the time evolution of the elastic and viscous moduli, as a function of the catalyst and filler concentration. The experimental data are modelled with a novel constitutive relation which is able to reproduce the rheology of isothermal and non-isothermal cross-linking processes as a function of the reaction time. The qualitative agreement between experiments and numerical simulations of the process is obtained for all the tests. The results of the present study indicate the value of rheological measurements to determine the thermomechanical properties of pre-ceramic polymers.

Journal or Publication Title: JOURNAL OF OPTOELECTRONICS AND ADVANCED MATERIALS
Volume: 8
Number: 2
Publisher: NATL INST OPTOELECTRONICS, 1 ATOMISTILOR ST, PO BOX MG-5, BUCHAREST-MAGURELE 76900, ROMANIA
Uncontrolled Keywords: rheology, pre-ceramic polymers, cross-linking, cscillatory test, constitutive relation
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
Date Deposited: 20 Apr 2012 09:21
Additional Information:

4th International Conference on New Research Trends in Materials Science (ARM-4), Constantsa, ROMANIA, SEP 04-06, 2005

Reprint adress: C. Balan, Politechn Univ, Hydraul Dept, Splaiul Independentei 313, Bucharest 060042, Romania.

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