| People | Locations | Statistics |
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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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Van Breemen, Lambèrt C. A.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (34/34 displayed)
- 2024A macroscopic viscoelastic viscoplastic constitutive model for porous polymers under multiaxial loading conditionscitations
- 2024Vezel-geïnduceerde kristallisatie in rekstromingen ; Fiber-induced crystallization in elongational flowscitations
- 2024Fiber-induced crystallization in elongational flowscitations
- 2023Deformation kinetics of single-fiber polypropylene composites:Adhesion improvement at the expense of toughness
- 2023Deformation kinetics of single-fiber polypropylene composites
- 2023Shear-Induced Structure Formation in MAH-g-PP Compatibilized Polypropylenescitations
- 2022In Situ Fabrication, Manipulation, and Mechanical Characterization of Free-Standing Silica Thin Films Using Focused Ion Beam Scanning Electron Microscopycitations
- 2022In Situ Fabrication, Manipulation, and Mechanical Characterization of Free-Standing Silica Thin Films Using Focused Ion Beam Scanning Electron Microscopycitations
- 2022Laser sintering of PA12 particles studied by in-situ optical, thermal and X-ray characterizationcitations
- 2020Polarization modulated infrared spectroscopy:A pragmatic tool for polymer science and engineeringcitations
- 2020Polymer spheres
- 2020Polarization modulated infrared spectroscopycitations
- 2020Transient dynamics of cold-rolled and subsequently thermally rejuvenated atactic-polystyrene using broadband dielectric spectroscopycitations
- 2020Thermally Reversible Diels–Alder Bond-Containing Acrylate Networks Showing Improved Lifetimecitations
- 2020Thermally Reversible Diels–Alder Bond-Containing Acrylate Networks Showing Improved Lifetimecitations
- 2019Predicting embrittlement of polymer glasses using a hydrostatic stress criterioncitations
- 2019Hydrostatic stress as indicator for wear initiation in polymer tribologycitations
- 2019Effect of low-temperature physical aging on the dynamic transitions of atactic polystyrene in the glassy statecitations
- 2019A novel experimental setup for in-situ optical and X-ray imaging of laser sintering of polymer particlescitations
- 2019Temperature dependent two-body abrasive wear of polycarbonate surfacescitations
- 2019Laser sintering of polymer particle pairs studied by in-situ visualizationcitations
- 2018Contact mechanics of high-density polyethylene: Effect of pre-stretch on the frictional response and the onset of wearcitations
- 2018Thin film mechanical characterization of UV-curing acrylate systemscitations
- 2018Contact mechanics of polyolefins: effect of pre-stretch on the frictional response and the onset of wear
- 2017Experimental setup for in situ visualization studies of laser sintering of polymer particles
- 2011Criteria to predict the embrittlement of polycarbonatecitations
- 2011Extending the EGP constitutive model for polymer glasses to multiple relaxation timescitations
- 2009Predicting the long-term mechanical performance of polycarbonate from thermal history during injection moldingcitations
- 2009Predicting the yield stress of polymer glasses directly from processing conditions: application to miscible systemscitations
- 2009Numerical simulation of flat-tip micro-indentation of glassy polymers: influence of loading speed and thermodynamic statecitations
- 2006Indentation: the experimenter's holy grail for small-scale polymer characterization?
- 2006Modelling large-strain deformation of thermo-rheologically complex materials : characterisation and validation of PMMA and iPP
- 2005Quantitative prediction of long-term failure of Polycarbonatecitations
- 2004Structure, deformation, and failure of flow-oriented semicrystalline polymerscitations
Places of action
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article
Transient dynamics of cold-rolled and subsequently thermally rejuvenated atactic-polystyrene using broadband dielectric spectroscopy
Abstract
The effect of plastic deformation on the molecular dynamics of atactic polystyrene (a-PS) was studied by broadband dielectric relaxation spectroscopy (BDRS), Fourier-transform infrared spectroscopy (FTIR) and polarized-light microscopy. Sheets of a-PS have been subjected to cold rolling, that is, mechanical rejuvenation, followed by a quenching step and fast heating above its glass-transition temperature, resulting in thermal rejuvenation. Cold rolling revealed, in addition to the known α- and γ(I)-relaxations, four hitherto unknown relaxation processes (II, III, IV and V). Using the framework of craze formation and multiplicity of the glass transition (E. Donth, G. H. Michler, Colloid Polym. Sci. 1989, 267, 557–567), supported by an activation-enthalpy/entropy analysis (Starkweather, W. Howard, Macromolecules 1981, 14, 1277–1281), the following physical picture emerges: (a) processes I and II represent local conformation transitions γ referring to chains of two different degrees of stretching (T/G-ratio); and (ii) processes III and IV were identified as helix-inversion processes of T2G2 helices as reported earlier for syndiotactic-rich PS—an assignment supported by FTIR results. Finally, the relaxation V could be attributed to the onset of the fibrillar glass transition (within crazes), leading to stress release by collapse of the fibrils and hence dying out of process V. Polarized-light microscopy confirmed the creation of oriented structures and internal stresses upon cold rolling, and their removal upon thermal rejuvenation.