Faculty of Physics - University of Bucharest

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FACULTY OF PHYSICS

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2024-11-22 1:34

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Conference: Bucharest University Faculty of Physics 2003 Meeting

Section: Polymer Physics

Title:

Molecular Orientation in Polymer Films Induced by Crystallization under Thermal-Centrifugal Fields

Authors:

I.Stamatin, Silviu Vulpe, Anca Dumitru, Georgeta Nan

Affiliation:

University of Bucharest, Faculty of Physics,Diamond Films, Plasma Polymerization & Novel carbon lab.,

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Keywords:

Abstract:

The alignment of polymeric chains with predefined conformations is one of most important target in many field applications like: macromolecular crystal growth, optical grating with polymer chains in preferential orientation, photo-refractive materials, and mechanical properties. Actually drawing only in fibers of melted polymers induces the polymer orientation. Mechanical stresses induced by drawing confer the polymers a specific texturing leaving free many other relaxations phenomena. This paper deals with inducing of alignment (orientation) in polymer films under centrifugal field. The new method consists in the film deposition on an inner side cylinder in rotation with fixed rpm. Simultaneous application of centrifuge field and thermal treatment induces transformations in preferential directions. The behavior of orientation-induced by crystallization of PE (polyethylene) and PAN (Polyacrylonitrile) films from the thermal treatment in centrifugal field has been investigated. The orientation induced in this way was monitored by polarized IR spectroscopy and XRD. Kewords: molecular orientation, polymer crystals, thin films.