Abstract
The effect of a dc discharge on the structure of film samples of isotactic and syndiotactic polypropylene, as well as propylene-1-hexene copolymers with isotactic and syndiotactic sequences, was studied. It was found that the plasma treatment of homopolymer films did almost not change their phase composition. However, in the propylene copolymers with 1-hexene (0.9 and 1.7 mol % 1-hexene) synthesized in an isospecific system, the γ-to-α phase transition was observed. The structural transition from a maximally ordered crystalline modification of form I, which has a body-centered orthorhombic unit cell, to a maximally disordered form of I, which has a simple orthorhombic unit cell, also occurred in a copolymer (1.1 mol % 1-hexene) synthesized in a syndiospecific system. It was found that an electric field that resulted from the localization of plasma electrons in the surface layers of polymer samples was responsible for the structural transformations observed.
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Original Russian Text © A.I. Drachev, L.A. Rishina, A.B. Gil’man, A.N. Shchegolikhin, 2007, published in Khimiya Vysokikh Energii, 2007, Vol. 41, No. 2, pp. 147–154.
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Drachev, A.I., Rishina, L.A., Gil’man, A.B. et al. Structural transitions in propylene-1-hexene copolymer films during low-temperature plasma treatment. High Energy Chem 41, 114–121 (2007). https://doi.org/10.1134/S0018143907020117
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DOI: https://doi.org/10.1134/S0018143907020117