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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Bernstorff, Sigrid
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (24/24 displayed)
- 2023Modulation of electronic and ionic conduction in mixed polymer conductors via additive engineering: Towards targeted applications under varying humiditycitations
- 2023Morphological Insights into the Degradation of Perovskite Solar Cells under Light and Humiditycitations
- 2023Ionic Liquid-Induced Inversion of the Humidity-Dependent Conductivity of Thin PEDOT:PSS Filmscitations
- 2022In Situ Observation of Morphological and Oxidation Level Degradation Processes within Ionic Liquid Post-treated PEDOT:PSS Thin Films upon Operation at High Temperaturescitations
- 2021Correlation of Thermoelectric Performance, Domain Morphology and Doping Level in PEDOT:PSS Thin Films Post‐Treated with Ionic Liquidscitations
- 2021Hollow metal island films as plasmonic sensors produced by galvanic replacementcitations
- 2020In Operando GISAXS and GIWAXS Stability Study of Organic Solar Cells Based on PffBT4T‐2OD:PC71BM with and without Solvent Additivecitations
- 2020Tailoring Morphology Compatibility and Device Stability by Adding PBDTTPD-COOH as Third Component to Fullerene-Based Polymer Solar Cellscitations
- 2019Self-Assembly in ultrahigh molecular weight sphere-forming diblock copolymer thin films under strong confinementcitations
- 2019Ionic Liquids as Post-Treatment Agents for Simultaneous Improvement of Seebeck Coefficient and Electrical Conductivity in PEDOT:PSS Filmscitations
- 2019Structure-function correlations in sputter deposited gold/fluorocarbon multilayers for tuning optical responsecitations
- 2019Application of GISAXS in the Investigation of Three-Dimensional Lattices of Nanostructurescitations
- 2019In-Operando Study of the Effects of Solvent Additives on the Stability of Organic Solar Cells Based on PTB7-Th:PC71BMcitations
- 2018Wet Imprinting of Channel‐Type Superstructures in Nanostructured Titania Thin Films at Low Temperatures for Hybrid Solar Cellscitations
- 2017Ta<sub>2</sub>N<sub>3</sub> nanocrystals grown in Al<sub>2</sub>O<sub>3</sub> thin layerscitations
- 2017Dislocation Movement Induced by Molecular Relaxations in Isotactic Polypropylenecitations
- 2017Codependence between Crystalline and Photovoltage Evolutions in P3HT:PCBM Solar Cells Probed with in-Operando GIWAXScitations
- 2017Pore size control of block copolymer-templated sol–gel-synthesized titania films deposited via spray coatingcitations
- 2016Influence of RF excitation during pulsed laser deposition in oxygen atmosphere on the structural properties and luminescence of nanocrystalline ZnO:Al thin filmscitations
- 2016Influence of RF excitation during pulsed laser deposition in oxygen atmosphere on the structural properties and luminescence of nanocrystalline ZnO:Al thin filmscitations
- 2016A Low Temperature Route toward Hierarchically Structured Titania Films for Thin Hybrid Solar Cellscitations
- 2015Effect of Blend Composition and Additives on the Morphology of PCPDTBT:PC 71 BM Thin Films for Organic Photovoltaicscitations
- 2015In operando morphology investigation of inverted bulk heterojunction organic solar cells by GISAXScitations
- 2015A Closer Look into Two-Step Perovskite Conversion with X-ray Scatteringcitations
Places of action
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article
Dislocation Movement Induced by Molecular Relaxations in Isotactic Polypropylene
Abstract
The thermal stability of deformation-induced dislocations was investigated in polypropylene (PP) during annealing by means of in-situ X-ray diffraction using synchrotron radiation. The samples were cold rolled to high strains (ε = 1.2) in order to introduce a high number of dislocation lattice defects and immediately stored in liquid nitrogen afterward. Then, stepwise annealing was applied from −180 °C up to above the melting temperature (165 °C) while synchrotron X-ray diffraction patterns were recorded at each step. The resulting low noise, high angular resolution diffraction patterns were evaluated using multireflection X-ray profile analysis (MXPA), revealing parameters such as the dislocation density and the thickness of the crystalline lamellae as a function of the annealing temperature. Two significant decreases of the dislocation density were found at annealing temperatures of about 10 and 85 °C. These distinct changes in the dislocation density could be identified as the mechanisms of β- and α-relaxation, respectively, by performing additional dynamic mechanical thermal analysis (DMTA). This behavior could be attributed to an increased intrinsic mobility of the macromolecules at these temperatures accompanied by thermal activation of dislocations, resulting in their mutual annihilation or their movement into the adjacent amorphous phase. The reduction of the dislocation density at the glass transition (β-relaxation) occurs because the stabilizing effect of backstresses originating from the amorphous phase is lost. At the α-relaxation the reduction in the dislocation density is attributed to defect propagations within the crystalline lamellae as well as in the amorphous phase and the recrystallization of intralamellar mosaic blocks (i.e., grains).