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Titolo:
Crystallization and cocrystallization in supramolecular comb copolymer-like systems: Blends of poly(4-vinylpyridine) and pentadecylphenol
Autore:
Luyten, MC; van Ekenstein, GORA; ten Brinke, G; Ruokolainen, J; Ikkala, O; Torkkeli, M; Serimaa, R;
Indirizzi:
Univ Groningen, Dept Polymer Chem, NL-9747 AG Groningen, Netherlands Univ Groningen Groningen Netherlands NL-9747 AG G Groningen, Netherlands Univ Groningen, Ctr Mat Sci, NL-9747 AG Groningen, Netherlands Univ Groningen Groningen Netherlands NL-9747 AG G Groningen, Netherlands Helsinki Univ Technol, Dept Engn Math & Phys, FIN-02015 Espoo, Finland Helsinki Univ Technol Espoo Finland FIN-02015 , FIN-02015 Espoo, Finland Univ Helsinki, Dept Phys, FIN-00014 Helsinki, Finland Univ Helsinki Helsinki Finland FIN-00014 ys, FIN-00014 Helsinki, Finland
Titolo Testata:
MACROMOLECULES
fascicolo: 13, volume: 32, anno: 1999,
pagine: 4404 - 4410
SICI:
0024-9297(19990629)32:13<4404:CACISC>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
SIDE-CHAIN CRYSTALLIZATION; POLYELECTROLYTE-SURFACTANT COMPLEXES; LIQUID-CRYSTAL POLYMERS; SOLID-STATE STRUCTURE; MESOMORPHIC STATE; PHASE; ORDER; HOMOPOLYMERS; TRANSITIONS; CHEMISTRY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: ten Brinke, G Univ Groningen, Dept Polymer Chem, Nijenborgh 4, NL-9747 AG Groningen, Netherlands Univ Groningen Nijenborgh 4 Groningen Netherlands NL-9747 AG
Citazione:
M.C. Luyten et al., "Crystallization and cocrystallization in supramolecular comb copolymer-like systems: Blends of poly(4-vinylpyridine) and pentadecylphenol", MACROMOLEC, 32(13), 1999, pp. 4404-4410

Abstract

The solid state of comb copolymer-like systems obtained by blending poly(4-vinylpyridine) with pentadecylphenol was studied by a combination of techniques. Depending on the amount of pentadecylphenol, several regimes are present. For 0.5 less than or equal to x less than or equal to 1.0 (x is the ratio between the number of phenol and pyridine groups) the alkyl tails forman interdigitated hexagonally packed crystalline layer. Small-angle X-ray scattering measurements show that for x 1.5 and 2.0 the excess pentadecylphenol cocrystallizes with the associated pentadecylphenol, with the free phenol groups probably aggregating near the middle of the crystalline layer. For x greater than or equal to 2.0 the orthorhombic crystal modification also appears. Finally for x greater than or equal to 3.0, part of the excess pentadecylphenol macrophase separates on crystallization, forming an additional phase of pure pentadecylphenol with the familiar orthorhombic packing. These findings are similar to results obtained for real comb copolymer systems, i.e., containing covalently bonded side chains. However, our systems are essentially different due to the dynamic hydrogen-bonding equilibrium, which implies that the equilibrium solid state may always involve some form of macrophase separation.

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Documento generato il 02/12/20 alle ore 13:59:16