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Simultaneous SAXS-WAXS Experiments on Semi-Crystalline Polymers: Example of PA11 and Its Brill Transition

Type
Articles dans des revues avec comité de lecture
Author
TENCE-GIRAULT, Sylvie
2073 Laboratoire Matière Molle et Chimie [MMC]
86289 Procédés et Ingénierie en Mécanique et Matériaux [Paris] [PIMM]
198035 Centre de recherche, développement, applications et technique de l'ouest [CERDATO]
554999 Centre de recherche Rhône-Alpes [CRRA]
LEBRETON, Sylvie
486315 Arkema [Arkema]
BUNAU, Oana
DANG, Patrick
486315 Arkema [Arkema]
BARGAIN, François
486315 Arkema [Arkema]

URI
http://hdl.handle.net/10985/15516
DOI
10.3390/cryst9050271
Date
2019
Journal
Crystals

Abstract

This manuscript of the special issue “Microstructural Evolution and Mechanical Behavior of Semi-Crystalline Polymers” aims to show that Small Angle X-ray Scattering (SAXS) and Wide Angle X-ray Scattering (WAXS) experiments performed simultaneously constitute a unique tool to obtain valuable information on the hierarchical structure of semi-crystalline polymers. These structural quantitative data are needed to model macroscopic properties of polymeric materials, for example their mechanical properties. To illustrate our point, we focus our study on the structure and morphology of polyamide 11. Through a simultaneous SAXS-WAXS experiment, we show that the absence of enthalpic signal in Differential Scanning Calorimetry (DSC) is not synonymous with the absence of structural and morphological evolution with temperature. The case of a thermally activated crystal–crystal transition, the Brill transition, is particularly detailed. Through this SAXS-WAXS study, we show, among other points, and for the first time, that the periodicity of crystalline lamellae (LP) changes at the transition, probably due to a modification of the amorphous phase’s free volume at the Brill transition. We also explain the crucial role of annealing to stabilize polymeric materials that may experience temperature changes over their lifetime. The influence of the annealing on the perfection of crystalline structure, morphology and mechanical behavior is more particularly studied.

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