Crystal Structure and Adjacent Reentry Folds of the α Form of Syndiotactic Polystyrene. Conformational and Packing Analysis by Molecular Mechanics

2003 ◽  
Vol 36 (4) ◽  
pp. 1368-1375 ◽  
Author(s):  
Roberto Napolitano ◽  
Beniamino Pirozzi
Keyword(s):  
Crystal Structure ◽  
Molecular Mechanics ◽  
Syndiotactic Polystyrene ◽  
Packing Analysis

Crystallization of Syndiotactic Polystyrene in β-Form. 4. Crystal Structure of Melt-Grown Modification

1999 ◽  
Vol 32 (15) ◽  
pp. 4905-4911 ◽  
Author(s):  
Masatoshi Tosaka ◽  
Masaki Tsuji ◽  
Shinzo Kohjiya ◽  
Laurent Cartier ◽  
Bernard Lotz
Keyword(s):  
Crystal Structure ◽  
Syndiotactic Polystyrene

Structure Analysis of a Rodlike Macromolecule: Poly(2,2'-(p,p'-Biphenyl)−6,6'-bis(4-Phenylquinoline))

1988 ◽  
Vol 134 ◽  
Author(s):  
Craig W. Burkhart ◽  
Jerome B. Lando ◽  
John K. Stille
Keyword(s):  
Crystal Structure ◽  
Structure Analysis ◽  
Molecular Packing ◽  
Unit Cell ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fiber Diffraction ◽  
Herringbone Structure ◽  
Packing Analysis

ABSTRACTUniaxially oriented, crystalline fibers of poly(2,2'-(p,p'-biphenyl)- 6,6'-bis(4-phenylquinoline)) [PBPQ], were subjected to structure analysis via x-ray diffraction and molecular packing analysis. Packing analysis was required due to the sparse and diffuse nature of the fiber diffraction photographs. The combination of the two techniques allowed us to resolve the crystal structure. PBPQ packs in a syn conformation, in a modified herringbone structure. It has a unit cell of a = 16.2Å, b = 5.31Å, c = 21.4Å. There are two independent chains in the unit cell. An overview of the refinement of the crystal structure, the packing analysis and the crystallography are presented.

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