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The effect of moderate pressure on the crystalline structure of oriented polypropylene tapes using in situ X-ray diffraction

Highly oriented isotactic polypropylene tapes were examined under moderate pressure by heating and cooling during in situ X‐ray diffraction (XRD) measurements using synchrotron radiation. The formation of γ‐isotatic polypropylene (iPP) is observed upon recrystallization under pressure from the melt....

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Published in:Polymers for advanced technologies 2007-09, Vol.18 (9), p.766-770
Main Authors: Shavit-Hadar, Liron, Rein, Dmitry M., Khalfin, Rafail L., Terry, Ann E., Cohen, Yachin
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description Highly oriented isotactic polypropylene tapes were examined under moderate pressure by heating and cooling during in situ X‐ray diffraction (XRD) measurements using synchrotron radiation. The formation of γ‐isotatic polypropylene (iPP) is observed upon recrystallization under pressure from the melt. The amount of γ‐iPP formed, as a function of pressure, exhibits a minimum at about 100 MPa. Upon applying moderate pressure (up to 60 MPa) significant changes are observed in the unit cell parameters, compared to their values at atmospheric pressure. At pressures above 60 MPa only a small decrease in the b unit cell parameter is observed. Copyright © 2007 John Wiley & Sons, Ltd.
doi_str_mv 10.1002/pat.922
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subjects crystallization
orientation
poly(propylene)
tapes
XRD
title The effect of moderate pressure on the crystalline structure of oriented polypropylene tapes using in situ X-ray diffraction
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