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2005 | 3 | 1 | 53-62
Tytuł artykułu

Thermal behavior of some aromatic copolyethers containing a propylenic spacer

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
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.
Wydawca

Czasopismo
Rocznik
Tom
3
Numer
1
Strony
53-62
Opis fizyczny
Daty
wydano
2005-03-01
online
2005-03-01
Twórcy
  • Department of Macromolecules, Technical University Iasi, Bd. Mangeron 71, 700050, Iasi, Romania, nhurduc@ch.tuiasi.ro
  • Department of Physical and Theoretical Chemistry, “A.I. Cuza” University Iasi, Bd. Carol 11, Iasi, Romania
autor
  • Department of Physical and Theoretical Chemistry, “A.I. Cuza” University Iasi, Bd. Carol 11, Iasi, Romania
  • Department of Macromolecules, Technical University Iasi, Bd. Mangeron 71, 700050, Iasi, Romania
  • Department of Physical and Theoretical Chemistry, “A.I. Cuza” University Iasi, Bd. Carol 11, Iasi, Romania
Bibliografia
  • [1] S. Alazaroaie, N. Hurduc, D. Scutaru, A. Dumitrascu, L. Petraru and C.I. Simionescu: “Phase Transfer Catalysis in the Polycondesation Process. XXV. The Relationship Between Structure and Supramolecular Ordering of Some Aromatic Polyethers Containing Flexible Spacer”, J. Macromol. Sci.: Part A Pure and Applied Chemistry, Vol. A40, (2003), pp. 1241–1252. http://dx.doi.org/10.1081/MA-120024837[Crossref]
  • [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. http://dx.doi.org/10.1016/S0014-3057(03)00002-8[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. http://dx.doi.org/10.1002/(SICI)1522-9505(19991201)273:1<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. http://dx.doi.org/10.1016/S0014-3057(97)00025-6[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. http://dx.doi.org/10.1002/pola.11066[Crossref]
  • [7] E. Freeman and B. Carroll: J. Phys. Chem., Vol. 62, (1958), pp. 394. http://dx.doi.org/10.1021/j150562a003[Crossref]
  • [8] A.N. Coats and R. Redfern: Nature, Vol. 68, (1964), pp. 201.
  • [9] P.D. Garn: J. Therm. Anal., Vol. 8, (1975), pp. 220.
  • [10] V.M. Gorbacev, A.V. Nicolaev and V.A. Logvinenko: textit J. Therm. Anal., Vol. 6, (1974) pp. 473.
  • [11] Hyperchem 4.5, Hypercube Inc (Licensed to M. Constantinescu).
  • [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. http://dx.doi.org/10.1016/S0141-3910(99)00169-X[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. http://dx.doi.org/10.1023/A:1013108625929[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. http://dx.doi.org/10.1023/A:1022268606503[Crossref]
  • [15] D.W. van Krevelen and P.J. Hoftyzen: emphProperties of polymers, 3rd Ed., Elsevier Scientific Publishing Company, Amsterdam, 1990.
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_BF02476237
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