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On the Crystal Structure of cis ‐1,4‐Poly(2,3‐dimethyl‐1,3‐butadiene)
Author(s) -
Pirozzi Beniamino,
Napolitano Roberto,
Petraccone Vittorio,
Esposito Simona
Publication year - 2003
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200390056
Subject(s) - torsion (gastropod) , crystal structure , monomer , spectral line , crystal (programming language) , crystallography , materials science , molecular geometry , dihedral angle , chain (unit) , molecule , chemistry , polymer , physics , quantum mechanics , composite material , hydrogen bond , computer science , medicine , surgery , programming language
Models for the crystal structure of cis ‐1,4‐poly(2,3‐dimethyl‐1,3‐butadiene) are elucidated by the joint use of molecular mechanics and WAXS. The chain conformation can be predicted by using different sets of potential functions. A model of crystal structure calculated by molecular mechanics has been refined in order to find the best accordance with the experimental X‐ray powder spectra. Another model is proposed to explain a few minor discrepancies between the calculated and the experimental WAXS powder spectra.Portion of the chain of cis ‐PDMBD, containing two monomer units with indications of the symmetry elements of the t ci line repetition group, and of the bond and torsion angles of the backbone, which are independent variables.