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Titolo:
Synthesis and properties of some epsilon-caprolactone-based di- and triblock polymers by anionic polymerization
Autore:
Buzdugan, E; Ghioca, P; Stribeck, N; Beckman, EJ; Serban, S;
Indirizzi:
Univ Hamburg, Inst TMC, D-20146 Hamburg, Germany Univ Hamburg Hamburg Germany D-20146 Inst TMC, D-20146 Hamburg, Germany Univ Pittsburgh, Dept Chem & Petr Engn, Pittsburgh, PA 15261 USA Univ Pittsburgh Pittsburgh PA USA 15261 tr Engn, Pittsburgh, PA 15261 USA Inst Chem Res ICECHIM, Bucharest 77208, Romania Inst Chem Res ICECHIM Bucharest Romania 77208 , Bucharest 77208, Romania
Titolo Testata:
MACROMOLECULAR MATERIALS AND ENGINEERING
fascicolo: 8, volume: 286, anno: 2001,
pagine: 497 - 505
SICI:
1438-7492(20010830)286:8<497:SAPOSE>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
DIBLOCK COPOLYMERS; BLOCK-COPOLYMERS; CRYSTALLIZATION; STYRENE; POLY(EPSILON-CAPROLACTONE)-BLOCK-POLYBUTADIENE; SYSTEMS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Buzdugan, E Univ Pittsburgh, Ctr Biotechnol & Bioengn, 300 Technol Dr, Pittsburgh, PA 15219 USA Univ Pittsburgh 300 Technol Dr Pittsburgh PA USA 15219 219 USA
Citazione:
E. Buzdugan et al., "Synthesis and properties of some epsilon-caprolactone-based di- and triblock polymers by anionic polymerization", MACRO MAT E, 286(8), 2001, pp. 497-505

Abstract

Block copolymers containing epsilon -caprolactone were synthesized. Mechanical properties as a function of chemical composition and domain structure as a function of elongation were studied. Based on previous optimal condition determinations by factorial design of experiments of epsilon -caprolactone anionic polymerization, polystyrene-block-poly(epsilon -caprolactone), polyisoprene-block-poly(epsilon -caprolactone), polystyrene-block-polybutadiene-block-poly(epsilon -caprolactone) (SBCL), and polystyrene-block-polyisoprene-block-poly(epsilon -caprolactone) (SICL) with different compositions where synthesized, and characterized by GPC and DSC. Both the SICL and SBCLmaterials are thermoplastic elastomers from which spin-cast films were prepared. Their mechanical properties were determined, small angle X-ray scattering (SAXS) measurements were carried out during straining, and dynamic mechanical analysis (DMA) was performed. All diblock polymers separate into atwo-phase structure, but the melting point of crystalline poly (epsilon -caprolactone) domains in the block polymer is higher than in the case of thehomopolymer. According to DMA data, some of the SICL and SBCL materials are three-phase systems, but others are only two-phase systems. The two-phasematerials show a considerable depression of the composite hard domain glass transition and, consequently, turn out to be very soft. It appears peculiar that the transition from three-phase to two-phase material is accomplished by decreasing the soft block length. For the soft material SAXS exhibitsa lamellar stack nanoscale structure and several reflections of colloidal crystals. As a function of increasing elongation, the crystal reflection broaden, whereas lamellar stacks rotate as a whole.

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Documento generato il 25/09/20 alle ore 22:18:13