The α″ "superstructure" of syndiotactic polystyrene: A frustrated structure

Macromolecules

Volumn 31, Issue 10, 1998, Pages 3303-3310

  Cartier, Laurent ^a   Okihara, Takumi ^a,b   Lotz, Bernard ^a  

^a INSTITUT CHARLES SADRON   (France)

^b OKAYAMA UNIVERSITY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

CRYSTAL ORIENTATION; MOLECULAR STRUCTURE;

AZIMUTHAL ORIENTATION; SYNDIOTACTIC POLYSTYRENES;

POLYSTYRENES;

EID: 0032069487     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma9719059     Document Type: Article

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22. 3 helical symmetry to form discotic mesophases. At high temperatures, a triangular array of one-column units is formed. On cooling, a three-column superlattice appears, which was analyzed as resulting from the frustration imposed by molecular interdigitation in triangular symmetry ("steric frustration of the molecular tails") when these tails become suffer and longer on crystallization. The frustration is described as a shift along the c axis of one stack relative to its two neighbors (which are also considered as being of opposite helicity). However, the departure from strict three-fold helical symmetry of the stacks leads to a less clear-cut frustration and significant rotational and translational disorders.