Order-order phase transition between spherical and cylindrical microdomain structures of block copolymer. I. Mechanism of the transition

Macromolecules

Volumn 33, Issue 3, 2000, Pages 968-977

  Kimishima, Kohtaro ^a,c   Koga, Tadanori ^a,d   Hashimoto, Takeji ^a,b  

^a JAPAN SCIENCE AND TECHNOLOGY AGENCY   (Japan)

^b KYOTO UNIVERSITY   (Japan)

^c Tonen Chemical Nasu Co Ltd   (Japan)

^d STONY BROOK UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

CRYSTAL LATTICES; CRYSTAL MICROSTRUCTURE; CRYSTAL ORIENTATION; CRYSTALLOGRAPHY; GRAIN SIZE AND SHAPE; MOLECULAR WEIGHT; ORDER DISORDER TRANSITIONS; POLYISOPRENES; POLYSTYRENES; X RAY SCATTERING;

BODY CENTERED CUBIC LATTICE; CYLINDRICAL MICRODOMAIN STRUCTURE; SMALL ANGLE X RAY SCATTERING; SPHERICAL MICRODOMAIN STRUCTURE;

BLOCK COPOLYMERS;

EID: 0034620342     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma991470k     Document Type: Article

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31. Strictly speaking, relative positions of higher order scattering maximum in a SAXS profile indicate only the lattice type but not the shape of microdomains. To determine the shape, the particle scattering due to the intra-microdomain interference (form factor) should be taken into consideration, though, in our experiment the form factor was not clearly observed. For PS-PI diblock copolymer it is well-known that the spherical domain structure (bcc-sphere or spheres in a face-centered cubic lattice (fcc-sphere)) appears for the A-B block copolymer with/ f < 0.17 (or f > 0.76), and the cylindrical structure occurs over the range of 0.17 < f < 0.33 (or 0.67 < f < 0.76). (see ref 2-4). In our case of f = 0.18, the block copolymer seems to have spherical or cylindrical microdomain structure. These three structures are easy to be distinguished by only the relative positions of higher order scattering maximum (1, √2, √3, √4, √5, √6, etc for bcc-sphere; 1, √4/3, √8/3, √11/3, √12/3, etc for fcc-sphere; 1, √3, √4, √7, √9, √12, √13, etc for hex-cylinder).
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37. 1/2.
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39. Kimishima, K.; Koga, T.; Hashimoto, T. Manuscript in preparation.