Thermal behavior of some aromatic copolyethers containing a propylenic spacer

• Authors: Nicolae Hurduc , Cristina Damian , Anca Tarus , Violeta Toader , Natalia Hurduc
• Languages of publication: EN

Abstracts

EN

The main objective of this paper is to study the thermal stability of some aromatic copolyethers containing a propylenic spacer. Some of the investigated copolyethers displayed a liquid crystalline (LC) behavior, with the presence of the mesogenic groups in the main chain, inducing high values of the thermal transition temperatures. As a consequence, a thermal stability study was necessary to establish the maximum temperature value for the LC behavior characterization. A thermal degradation mechanism is proposed, taking into consideration the azobenzenic unit as the weakest link in the polymer chain and thus, the starting point of the thermal degradation process. The degradation mechanisms were correlated with the chemical structure and the polarity and conformation of the chains. Conformational analysis was performed using molecular simulations. Freeman-Caroll and Coats-Redfern methods were used to calculate some kinetic characteristics.

Keywords

EN

Thermal stability; liquid crystalline copolyether; azobenzene; thermal degradation mechanism

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2005
• Volume: 3
• Issue: 1
• Pages: 53-62

Dates

published

1 - 3 - 2005

online

1 - 3 - 2005

Contributors

author

Nicolae Hurduc

• Department of Macromolecules, Technical University Iasi, Bd. Mangeron 71, 700050, Iasi, Romania

author

Cristina Damian

• Department of Physical and Theoretical Chemistry, “A.I. Cuza” University Iasi, Bd. Carol 11, Iasi, Romania

author

Anca Tarus

• Department of Physical and Theoretical Chemistry, “A.I. Cuza” University Iasi, Bd. Carol 11, Iasi, Romania

author

Violeta Toader

• Department of Macromolecules, Technical University Iasi, Bd. Mangeron 71, 700050, Iasi, Romania

author

Natalia Hurduc

• Department of Physical and Theoretical Chemistry, “A.I. Cuza” University Iasi, Bd. Carol 11, Iasi, Romania

References

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Identifiers

DOI

10.2478/BF02476237