Please use this identifier to cite or link to this item: doi:10.22028/D291-28984
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Title: Anisotropic nanoparticles as templates for the crystalline structure of an injection-molded isotactic polypropylene/TiO 2 nanocomposite
Author(s): Zhang, Peng
Kraus, Tobias
Language: English
Title: Polymer : the international journal for the science and technology of polymers
Volume: 130
Startpage: 161
Endpage: 169
Publisher/Platform: Elsevier
Year of Publication: 2017
Publikation type: Journal Article
Abstract: We study the molecular origins of anisotropy in a semicrystalline polymer nanocomposite that is caused by aligned, elongated filler nanoparticles. Our study is based on spatially resolved 2D WAXS/SAXS data that indicates the arrangement of molecules, lamellae, and filler particles in the composite. Isotactic polypropylene (IPP) samples filled with anisotropic TiO2 nanoparticles were prepared by injection molding. The nanocomposite contained IPP crystals with preferential alignment, while neat IPP formed crystals with random orientation under the same preparation conditions. We studied the mechanism through which anisotropic TiO2 nanoparticles change the molecular assembly in the polymer melt and cause preferential alignment. Our hypothesis is that shear forces during injection molding align the long axis of the nanoparticles parallel to the melt flow direction, and the particles align the adjacent IPP molecules. The aligned IPP molecules in the melt then serve as nuclei in crystal growth during solidification. This templating increases the elastic modulus compared to that of neat IPP.
DOI of the first publication: 10.1016/j.polymer.2017.09.067
URL of the first publication:
Link to this record: hdl:20.500.11880/28056
ISSN: 0032-3861
Date of registration: 10-Oct-2019
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Chemie
Professorship: NT - Prof. Dr. Tobias Kraus
Collections:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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