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2005 | 3 | 1 | 53-62
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Thermal behavior of some aromatic copolyethers containing a propylenic spacer

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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.
Physical description
1 - 3 - 2005
1 - 3 - 2005
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  • [2] S. Alazaroaie, V. Toader, I. Carlescu, K. Kazmierski, D. Scutaru, N. Hurduc and C.I. Simionescu: “Liquid Crystallyne Polymers. 14. Synthesis and Thermal Behaviour of Some Polyethers Containing Azo-mesogens”, Eur. Polym. J., Vol. 39, (2003), pp. 1333–1339.[Crossref]
  • [3] N. Hurduc, M. Prajinaru, N. Hurduc and S. Alazaroaie: “Non-isothermal kinetic study of the thermal degradation process of some liquid crystalline azo-polyethers”, Materiale Plastice, Vol. 39, (2002), pp. 231–234.
  • [4] O. Catanescu, N. Hurduc, D. Scutaru, A. Stoleru and C.I. Simionescu: “Liquid Crystalline Polymers 9. Synthesis and Thermal Behavior of Some Oligomers Containing a Diethyletheric Spacer”, Die Angew. Macromol. Chem., Vol. 273, (1999), pp. 91–95.<91::AID-APMC91>3.0.CO;2-M[Crossref]
  • [5] N. Hurduc, A. Daoudi, J.M. Buisine, V. Barboiu and C.I. Simionescu: “Liquid Crystalline Polymers- 4. A study of the Thermal Behavior of Some Ternary Copolyethers, Containing 4,4′-dihydroxyazobenzene, Bisphenol A and 1,1-bis(4-hydroxyphenyl)ethane”, Eur. Polym. J., Vol. 34 (1997), pp. 123–125.[Crossref]
  • [6] K. Kazmierski, N. Hurduc, G. Sauvet and J. Chojnowski: “Polysiloxanes with Chlorobenzyl Groups as Precursors of New Organic-Silicone Materials”, J. Polym. Sci.: Part A: Polymer Chemistry, Vol. 42, (2004), pp. 1682–1692.[Crossref]
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  • [12] A. Tarus, N. Hurduc, O. Catanescu, C. Cobzaru and N. Hurduc: “Phase Transfer Catalysis in Polycondensation Processes XXIV. On the Thermal Stability of Some Aromatic Polyethers Containing a Propylenic Spacer”, Polym. Degrad. Stab., Vol. 68, (2000), pp. 87–91.[Crossref]
  • [13] A. Creanga, G. Pokol, N. Hurduc, Cs. Novak, S. Alazaroaie and N. Hurduc: “Thermal behavior and primary degradation mechanism of some aromatic polyethers with semiflexible chain”, J. Therm. Anal. Cal., Vol. 66, (2001), pp. 859–868.[Crossref]
  • [14] N. Hurduc, A. Creanga, G. Pokol, Cs. Novak, D. Scutaru, S. Alazaroaie and N. Hurduc: “The degradation mechanism using TG-MS technique of some aromatic polyethers containing flexible spacers”, J. Therm. Anal. Cal., Vol. 70, (2002), pp. 877–887.[Crossref]
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