Association of the Ion Pair End-Groups of Halato Telechelic Polymers in Nonpolar Solvents

  • R. Jerome
  • G. Broze
  • Ph. Teyssie
Part of the Polymer Science and Technology book series (NISS, volume 30)

Abstract

Halato telechelic polymers (HTP) result from the complete ionization of both ends of telechelic prepolymers. In nonpolar solvents, they form homogeneous gels which upon dilution generally transform into more or less viscous solutions unless they display a phase separation process. In the former case, critical gel concentrations (Cge1) as low as 1.5 g dL-1 are observed. This process is dependent on flie molecular weight of the prepolymer according to the general relationship \({C_{gel}} = k.{{\bar M}_n}^{ - 1/2}\). Solutions of 10 g DL-1 α,ω alkaline earth dicarboxylato polybutadiene \(({{\bar M}_n} = \,4,\,600)\) in xylene exhibit an attractive thermorheological simplicity and obey a deformation mechanism controlled by the stability and the mean size of multiplets formed by the carboxylate end-groups. A secondary relaxation characteristic of these multiplets is clearly evidenced. Furthermore, the shear-thickening character of these solutions is noteworthy. Nature of ion pairs, polarity of the medium, and temperature significantly influence the general behavior of HTP solutions and prove its electrostatic origin. At high concentrations (> 50 g dL-l), the multiplets can possibly aggregate and form periodic structures with a lamellar character, as evidenced by the SAXS spectra of α,ω) — Ba and K dicarboxylatopolybutadienes in toluene.

Keywords

Hydrocarbon Rubber Carboxylate Macromolecule Acetyl 

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Copyright information

© Plenum Press, New York 1985

Authors and Affiliations

  • R. Jerome
    • 1
  • G. Broze
    • 1
  • Ph. Teyssie
    • 1
  1. 1.Laboratory of Macromolecular Chemistry and Organic CatalysisUniversity of LiegeLiegeBelgium

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