Crystal Structure of Form I of Syndiotactic Poly(p ara-methylstyrene)

The crystalline structure of form I of syndiotactic poly(para-methylstyrene) is described. In this form, the polymer chains assume a s(2/1)2 helical conformation and are packed according to the space group P21/a in a unit cell with a = 24.5 Å, b = 12.4 Å, c = 8.1 Å, and γ = 143.5°. The proposed mode...

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Bibliographic Details
Published inMacromolecules Vol. 39; no. 15; pp. 5037 - 5042
Main Authors Esposito, Giuseppe, Tarallo, Oreste, Petraccone, Vittorio
Format Journal Article
LanguageEnglish
Published Washington, DC American Chemical Society 25.07.2006
Subjects
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Structure, morphology and analysis
Structural model
Styrene(methyl) polymer
Experimental study
Lattice parameters
Syndiotactic polymer
Crystalline structure
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Summary:The crystalline structure of form I of syndiotactic poly(para-methylstyrene) is described. In this form, the polymer chains assume a s(2/1)2 helical conformation and are packed according to the space group P21/a in a unit cell with a = 24.5 Å, b = 12.4 Å, c = 8.1 Å, and γ = 143.5°. The proposed model may be described by a stacking of layers of alternating right- and left-handed helical chains efficiently packed in an “interdigital structure” in which phenyl rings belonging to one chain interlock with the phenyl rings of the two adjacent chains of opposite chirality. A disorder in the correct succession of the layers is suggested. A possible similarity between this form and the nanoporous δ form of syndiotactic polystyrene, suggested by the fact they are both obtainable by guest removal from α class clathrates, is analyzed.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma060940p