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The Electron Diffraction by Amorphous Polymers
G. D. Coumoulos
Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences
Vol. 182, No. 989 (Dec. 16, 1943), pp. 166-179
Published by: Royal Society
Stable URL: http://www.jstor.org/stable/97708
Page Count: 15
You can always find the topics here!Topics: Polymers, Methacrylates, Liquids, Molecules, Acetates, Acrylates, Electron diffraction, Molecular chains, Atoms, Wave diffraction
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The configurations of the polyvinyl acetate, and the acrylate and methacrylate polymers revealed by electron photographs suggest a zigzag C-atom chain for the long main chain, which has the 1, 3 structure, with the side-chains alternately on the right and the left of the zigzag chains and on planes approximately perpendicular to the axis of the main chain. These side-chains are subject to lateral cohesive forces, which group them in clusters. In the clusters the side-chains tend to arrange themselves parallel to one another. In the lenses the clusters consist of a small number of side-chains without any apparent arrangement, whilst the multilayer pattern indicates a certain orientation of the side-chains with perhaps a larger number grouping together. The patterns indicate an 'amorphous' character which is attributed to the tendency of the side-chains to close-packing in clusters, producing distortion of the main chain and thus preventing adlineation. On the basis of this configuration some of the elastic properties of these polymers are discussed, and a note is made on the occurrence of high elasticity.
Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences © 1943 Royal Society