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Study of multiblock polyamide-6/Poly-(isoprene) copolymers by positron annihilation spectroscopy

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Central European Journal of Chemistry

Abstract

Positron annihilation lifetime spectroscopy (PALS) has been used to determine the free volume in multiblock polyamide-6/poly-(isoprene) copolymers (PA-6/PI), synthesized via activated anionic bulk copolymerization. The diisocyanate functionalized telechelic PI, blocked with caprolactam (CL) has been used as a commoner and an activator at the same time. The elastic PI block incorporated into the main chain of PA-6 affects the amorphous and crystal phase of the copolymer leading to changing in degree of crystallinity. The positron annihilation lifetime spectroscopy (PAL) and Doppler broadening of annihilation line (DBAL) technique in a set of pure PA-6 and PA-6/PI copolymers with two different compositions have been applied and evaluation of the size of free-volume holes (pores), localized mainly in the disordered regions of the PA-6/PI copolymer by measuring the o-Ps lifetime (τ3) and o-Ps intensity (I3) has been performed.

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Authors and Affiliations

  1. Department of Polymer Engineering, University of Chemical Technology and Metallurgy, 1756, Sofia, Bulgaria

    R. Bryaskova & R. Mateva

  2. Institute of Nuclear Research and Nuclear Energy, 1784, Sofia, Bulgaria

    N. Djourelov

  3. Faculty of Physics, Sofia University, 1126, Sofia, Bulgaria

    M. Krasteva

Authors
  1. R. Bryaskova
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  2. R. Mateva
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  3. N. Djourelov
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  4. M. Krasteva
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Correspondence to R. Bryaskova.

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Bryaskova, R., Mateva, R., Djourelov, N. et al. Study of multiblock polyamide-6/Poly-(isoprene) copolymers by positron annihilation spectroscopy. cent.eur.j.chem. 6, 575–580 (2008). https://doi.org/10.2478/s11532-008-0073-9

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  • DOI: https://doi.org/10.2478/s11532-008-0073-9

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