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Lattice imaging in melt crystallized polypropylene thin films

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Abstract

Melt crystallized isotactic polypropylene thin films of thickness between 30 and 100 nm have been investigated by high-resolution transmission electron microscopy at room temperature. The c-axis projection of the 2*31 helices and their packing in the lattice were clearly visible in flat-on lamellae of the α-phase following reconstruction from the components of the image Fourier transform corresponding to the (110) and (040) lattice planes, and the image power spectra also indicated contributions from (130) and (060) relfections, corresponding to a line resolution of about 0.35 nm. These results are discussed in terms of Bloch wave calculations based on the generally accepted structure for the α-phase. Attempts to obtain lattice images of the β-phase in isotactic polypropylene and melt crystallized syndiotactic polypropylene under similar operating conditions are also briefly discussed, although these provided relatively little structural information.

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Plummer, C.J.G., Gensler, R. & Kausch, HH. Lattice imaging in melt crystallized polypropylene thin films. Colloid Polym Sci 275, 1068–1077 (1997). https://doi.org/10.1007/s003960050185

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  • DOI: https://doi.org/10.1007/s003960050185

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