Modification of styrene-isoprene copolymers—2. Chain extension with ethylene oxide

Mitov, Z.; Velichkova, R.

doi:10.1016/0014-3057(92)90081-c

Cited by 5 publications

(2 citation statements)

References 4 publications

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“…The synthesis of (α,ω)‐hydroxyl PEO–PIP–PEO copolymers was performed by a living anionic polymerization technique described previously 14. The tetramer of α‐methyl styryldipotassium (α‐MeStK) was selected as a bifunctional initiator.…”

Section: Methodsmentioning

confidence: 99%

Anionic copolymerization of hexanelactam with functionalized polyisoprene

Mateva

Filyanova

Velichkova

et al. 2003

J. Polym. Sci. A Polym. Chem.

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Block copolymers of the A-B-C-B-A type were synthesized for the first time via the activated anionic polymerization of hexanelactam (HL) with Na-HL as an initiator and macroactivators [or polymeric activators (PACs)] as elastificators for nylon-6. The PACs were prepared by the functionalization of telechelic hydroxylterminated poly(ethylene oxide)-polyisoprene-poly(ethylene oxide) copolymers with different diisocyanates. Hexamethylene diisocyanate (1,6-diisocyanatohexane) and isophorone diisocyanate (5-isocyanate1-isocyanatomethyl-1,3,3-trimetylcyclohexane) were used as functionalizing agents. This article reports on the effects that the various central elastomeric PAC blocks (type, content, and molecular weight) had on the polymerization kinetics and on the structure and molecular weights of the multiblock copolymers obtained. The copolymers were characterized spectroscopically.

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Section: Methodsmentioning

confidence: 99%

Anionic copolymerization of hexanelactam with functionalized polyisoprene

Mateva

Filyanova

Velichkova

et al. 2003

J. Polym. Sci. A Polym. Chem.

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“…The synthesis of (α,ω)−hydroxyl PI (PI-OH) was performed by living anionic polymerization technique as described previously [8]. In order to obtain (α,ω)−hydroxyl functionalized PI, the polymerization was terminated by an excess of ethylene oxide (EO) [9].…”

Section: Synthesis Of Polyisoprene Prepolymersmentioning

confidence: 99%

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

Bryaskova

Mateva

Djourelov³

et al. 2008

Open Chemistry

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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 (τ 3 ) and o-Ps intensity (I 3 ) has been performed. © Versita Warsaw and Springer-Verlag Berlin Heidelberg.

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