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. 2017 Mar 17;9(3):110. doi: 10.3390/polym9030110

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© 2017 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) Polarized IR spectra for the PP and PP/TiO₂ composite films in the range of 1020 to 950 cm⁻¹. (b) Crystalline orientation (f_c) of PP as function of TiO₂ content.