Article (Scientific journals)
EXAFS study of halato-telechelic polymers and-capped with group IVb metal carboxylates at room and low temperature
Vlaic, G.; Navarra, G.; Regnard, J. R. et al.
1995In Journal of Physics II France, 5 (5), p. 665-675
Peer reviewed
 

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Keywords :
halatotelechelic polymer
Abstract :
[en] The EXAFS analysis at 300, 70 and 5 K has shown that the thermal disorder is very low in a carboxylato telechelic polybutadiene neutralized with an increasing excess of Zr isopropoxide. Two types of Zr-O bonds in the first shell account for the experimental data. The Zr-O distances and number of oxygen neighbours in the two subshells are found to be independent of temperature in the investigated range. The proportion of Zr in the samples has no effect on the total number of oxygen atoms around Zr, in contrast to their relative distribution in the two subshells. The number of Zr atoms increases in the second shell with the total amount of this metal. Upon increasing degree of neutralization from 200 to 600%, the static disorder increases together with a strong reduction of the dynamic part of the Debye-Waller (DW) factor. At a high degree of neutralization (> 400%), the DW factor for the Zr-Zr bond is largely independent of temperature. These observations agree with formation of Zr polynuclear microdomains, the size and rigidity of which increase with the Zr content, in good agreement with the profound changes previously reported in the viscoelastic properties of these materials.
Research center :
Center for Education and Research on Macromolecules (CERM)
Disciplines :
Materials science & engineering
Chemistry
Author, co-author :
Vlaic, G.;  University of Trieste, Italy
Navarra, G.;  University of Cagliari, Italy
Regnard, J. R.;  University Joseph Fourier, Grenoble, France
Williams, C. E.;  University of Paris Sud, Orsay, France > LURE
Jérôme, Robert ;  Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Language :
English
Title :
EXAFS study of halato-telechelic polymers and-capped with group IVb metal carboxylates at room and low temperature
Publication date :
May 1995
Journal title :
Journal of Physics II France
Publisher :
EDP Science
Volume :
5
Issue :
5
Pages :
665-675
Peer reviewed :
Peer reviewed
Funders :
BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique
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