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Titolo:
Supramolecular routes to hierarchical structures: Comb-coil diblock copolymers organized with two length scales
Autore:
Ruokolainen, J; Saariaho, M; Ikkala, O; ten Brinke, G; Thomas, EL; Torkkeli, M; Serimaa, R;
Indirizzi:
Helsinki Univ Technol, Dept Engn Phys & Math, FIN-02015 Espoo, Finland Helsinki Univ Technol Espoo Finland FIN-02015 , FIN-02015 Espoo, Finland Univlandsingen, Ctr Mat Sci, Dept Polymer Sci, NL-9747 AG Groningen, Nether Univ Groningen Groningen Netherlands NL-9747 AG 747 AG Groningen, Nether MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA MIT Cambridge MA USA 02139 , Dept Mat Sci & Engn, Cambridge, MA 02139 USA Univ Helsinki, Dept Phys, FIN-00014 Helsinki, Finland Univ Helsinki Helsinki Finland FIN-00014 ys, FIN-00014 Helsinki, Finland
Titolo Testata:
MACROMOLECULES
fascicolo: 4, volume: 32, anno: 1999,
pagine: 1152 - 1158
SICI:
0024-9297(19990223)32:4<1152:SRTHSC>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
LIQUID-CRYSTALLINE BLOCK; POLYELECTROLYTE-SURFACTANT COMPLEXES; END-FUNCTIONALIZED OLIGOMERS; SIDE-CHAIN; MORPHOLOGICAL STRUCTURE; TRIBLOCK COPOLYMERS; POLYMERIC MATERIALS; MESOMORPHIC STATE; SOLID-STATE; BEHAVIOR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
62
Recensione:
Indirizzi per estratti:
Indirizzo: Ikkala, O Helsinkinland Technol, Dept Engn Phys & Math, POB 2200, FIN-02015 Espoo, Fi Helsinki Univ Technol POB 2200 Espoo Finland FIN-02015 spoo, Fi
Citazione:
J. Ruokolainen et al., "Supramolecular routes to hierarchical structures: Comb-coil diblock copolymers organized with two length scales", MACROMOLEC, 32(4), 1999, pp. 1152-1158

Abstract

We show that polymeric materials characterized by two length scales are obtained if diblock copolymers are mixed with amphiphilic selective solvents,leading to self-organization which combines the "block copolymer length scale" with a much shorter "nanoscale". In this work, the amphiphilic compound is 3-n-pentadecylphenol (PDP) which is hydrogen-bonded to the pyridine group of polystyrene-block-poly(4-vinylpyridine), i.e., PS-b-P4VP, The molecular architecture resembles comb-coil diblock. copolymers A-block-(B-graft-C) but is obtained using the supramolecular assembly route. The structures were determined with. a combination of transmission electron microscopy and small-angle X-ray scattering. On the block copolymer scale (300 A range), the PS blocks are microphase-separated from the P4VP(PDP)(x) blacks, where xdenotes the ratio between the number of phenol and pyridine groups. For PS-b-P4VP block copolymers having a spherical morphology and P4VP as the minority component, the structure of PS-b-P4VP(PDP)(x) changes from spherical to hexagonal and further to lamellar as a function of the amount of PDP added. For all comb-call diblock copolymer morphologies, the P4VP(PDP)(x) domains are further "nanophase-separated" into lamellar structures due to microphase separation of the comb copolymer-like complex between P4VP and PDP, The morphology diagram is presented for stoichiometric conditions (x = 1), using a range of different PS-b-P4VP block copolymers.

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Documento generato il 24/11/20 alle ore 11:16:04