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Short-range order in some polymer melts from X-ray diffraction

✍ Scribed by J. D. Londono; A. Habenschuss; J. G. Curro; J. J. Rajasekaran

Publisher: John Wiley and Sons
Year: 1996
Tongue: English
Weight: 556 KB
Volume: 34
Category: Article
ISSN: 0887-6266
DOI: 10.1002/(sici)1099-0488(199612)34:17<3055::aid-polb17>3.0.co;2-6

No coin nor oath required. For personal study only.

✦ Synopsis

Wide-angle X-ray diffraction measurements were performed on polymer melts of isotactic and syndiotactic polypropylene (IPP and SPP), poly(ethylenepropy1ene) (PEP), polystyrene (PS), polyisobutylene (PIB), and polyethylene (PE), to study the dependence of the shortrange structure of polymer liquids on chain architecture. Total structure functions, which comprise intra-and intermolecular contributions, were derived from the scattering data.

The trivial Fourier components of the intramolecular structure (C-C C= 1.54 A and C -C -C * 2.55 A) were subtracted from the total structure functions. The remaining functions contain only those intramolecular contributions dependent on the chain's conformational degrees of freedom, plus the intramolecular contributions. The structural differences between the polymers in momentum space are discerned only when the trivial components are subtracted. This subtraction also reduces the effects of truncation errors on Fourier transformation to real space. The short-range structure of PIB appears very different compared to all the others, which correlates with anomalies in a number of physical properties for this polymer.

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