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

• Authors: R. Bryaskova , R. Mateva , N. Djourelov , M. Krasteva
• Languages of publication: EN

Abstracts

EN

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. [...]

Keywords

EN

O-positronium annihilation; Anionic polymerization and block copolymers

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2008
• Volume: 6
• Issue: 4
• Pages: 575-580

Dates

published

1 - 12 - 2008

online

28 - 10 - 2008

Contributors

author

R. Bryaskova

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

author

R. Mateva

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

author

N. Djourelov

• Institute of Nuclear Research and Nuclear Energy, 1784, Sofia, Bulgaria

author

M. Krasteva

• Faculty of Physics, Sofia University, 1126, Sofia, Bulgaria

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Identifiers

DOI

10.2478/s11532-008-0073-9