The structures of poly(di- n-alkylsilylenemethylene)s

The structure of poly(diethylsilylenemethylene) (PDESM), poly(di- n-butylsilylenemethylene) (PDBSM), poly(di- n-pentylsilylenemethylene) (PDPeSM) and poly(di- n-hexylsilylenemethylene) (PDHSM) have been studied using X-ray and electron diffraction methods. The structure of poly(di- n-propylsilylenem...

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Bibliographic Details
Published in:Polymer (Guilford) 2001-04, Vol.42 (9), p.4261-4269
Main Authors: Park, S.-Y., Interrante, L.V., Farmer, B.L.
Format: Article
Language:English
Subjects:
Applied sciences
Conformation
Electron diffraction
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Poly(di- n-alkylsilylenemethylene)s
Properties and characterization
Structure, morphology and analysis
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Summary:The structure of poly(diethylsilylenemethylene) (PDESM), poly(di- n-butylsilylenemethylene) (PDBSM), poly(di- n-pentylsilylenemethylene) (PDPeSM) and poly(di- n-hexylsilylenemethylene) (PDHSM) have been studied using X-ray and electron diffraction methods. The structure of poly(di- n-propylsilylenemethylene) (PDPrSM) has been studied and reported in a separate paper. PDBSM, PDPrSM, PDPeSM and PDHSM all have similar packing with a two dimensional monoclinic ab-projection of the unit cell. PDESM with the shortest alkyl side chain, has a nearly orthorhombic unit cell (γ ∗=∼88°) containing two chains (four repeat units), one at the corner and the second nearly in the center of the ab-projection of the unit cell. The backbone conformation of each of these polysilylenemethylenes (PSMs) is all- gauche, giving them a 4 1 helical structure. The length of the alkyl side chains affects the packing without changing the backbone conformation.
ISSN:0032-3861
1873-2291
DOI:10.1016/S0032-3861(00)00772-2