Zeinolebadi A. In-situ Small-Angle X-ray Scattering Investigation of Transient Nanostructure of Multi-phase Polymer Materials Under Mechanical Deformation

Springer-Verlag Berlin Heidelberg, 2013. XVI, 106 p. 70 illus., 67 illus. in color. — ISBN: 978-3-642-35412-0, ISBN: 978-3-642-35413-7 (eBook), DOI 10.1007/978-3-642-35413-7 — (Series: Springer Theses).Nominated by the University of Hamburg (Germany) as an outstanding PhD thesis
Answers a central question in polymer materials research: "Why don't prepared composites show less fatigue than the pure plastics?"
Applies a simultaneous analysis of mechanical testing and X-Ray scattering at DESY in HamburgThe results in this dissertation set the ground to answer a fundamental question in data-driven polymer material science: "Why don't prepared composites show less fatigue than the pure plastics?" A simultaneous analysis of mechanical testing and small angle X-Ray scattering from the DESY source in Hamburg has been applied to approach this question, which is also central to the European research project "Nanotough", and the results are clearly presented in this book. The evolution of the materials structure is visualized and quantitatively analyzed from exhaustive sequences of scattering images. Three different classes of polymer composites are presented as typical and illustrative examples. The obtained results illustrate that the interactions of their components can cause unpredictable structural effects, ultimaltely leading to a weakening of the material, where a reinforcement was expected.Content Level » Research
Keywords » Layered Silicates - Material Fatigue - Multi-phase Materials - Polymer Composites -Polymer Microstructure - Polypropylene Nanocomposites - Small Angle X-Ray Scattering -Structure-property Relationship - Thermoplastic Polyurethane Elastomers
Related subjects » Characterization & Evaluation of Materials - Materials - Polymer Science -Special types of Materials.Microstructure of Polymers
Mechanical Behavior
Constructing Structure–Property-Relationship
Structure Analysis by X-ray Scattering
SAXS Theories
Geometry of Scattering
From the Scattering Pattern to the Materials Structure
Objectives and AimsExperimental PartSAXS Setup
Thermoplastic Polyurethane Elastomers
Polypropylene/Montmorillonite Nanocomposites
Microfibrillar CompositesData EvaluationEvaluation of Mechanical Parameters
Evaluation of Scattering Data
Pre-evaluation of SAXS Data
Computing CDFs
Computing the Scattering Power
Computing Isotropic ScatteringThermoplastic Polyurethane Elastomers Under Uniaxial DeformationOptical Microscopy
DSC Measurements
Mechanical Data
Measured SAXS
Nanostructure in Real Space (CDF)
Macroscopic and Nanoscopic Strain
Long Period Peaks in the CDF: Analysis of Peak Shape
Demonstration of L-Peak Shape Variation
Principal Deformation Mechanism
Domain Formation, Transformation and DestructionPolypropylene/Montmorillonite Nanocomposites: Continuous Stretching and Load-CyclingMechanical Data
Discussion of Measured SAXS Patterns
Discussion of the CDF Patterns
Analysis of the Block-Structure
Analysis of the Scattering Power
Quantitative Analysis of Meridional Peaks
Nucleation and Compatibilization in the PP/MMT Nanocomposites
Load-Cycling ExperimentsHDPE/PA Microfibrillar Composites Under Load-CyclingMicro- Versus Nanostructure
Nanostructure of Undeformed Materials
General Nanostructure Evolution in Load-Cycling Tests
Response of Stress and Nanoscopic Strain
Response of the Lateral Nanoscopic Strain
Response of the Scattering Power
Plastic Flow in P6HY (20/80/0)
Material FatigueSummary and Future WorksCurriculum Vitae