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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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Almeida, Olivier De
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (20/20 displayed)
- 2022Determination of a degradation-induced limit for the consolidation of CF/PEEK composites using a thermo-kinetic viscosity modelcitations
- 2021Effect of PEEK degradation on commingled fabrics consolidation
- 2021Effect of melt spinning on the integrity of poly(ether ether ketone) for commingled yarn based composite preformscitations
- 2021Effect of poly(ether ether ketone) degradation on commingled fabrics consolidationcitations
- 2020Characterisation and modelling of the temperature and rate dependent shear behaviour of a non-consolidated powder impregnated fabric
- 2019Experimental characterization and modeling of the temperature and rate-dependent shear behaviour of powder-impregnated glass fiber/PA66 woven semipregscitations
- 2019Modelling strategy of IR lamps with integrated reflector used in the manufacturing processof thermoplastic composite tapes
- 2019Pixel Coloring modelling of PEKK crystallization
- 2019Modeling of IR lamps with coated reflector used in the slurry powder impregnation process of composite tapescitations
- 2018The role of microcrystalline structure on optical scattering characteristics of semi-crystalline thermoplastics and the accuracy of numerical input for IR-heating modelingcitations
- 2017Experimental study of polymerization and crystallization kinetics of polyamide 6 obtained by anionic ring opening polymerization of ε-caprolactamcitations
- 2017Towards a coupled heating-forming simulation of the thermoforming of thermoplastic compositescitations
- 2017Long term ageing of polyamide 6 and polyamide 6 reinforced with 30% of glass fibers: physicochemical, mechanical and morphological characterizationcitations
- 2017A non-invasive experimental approach for surface temperature measurements on semi-crystalline thermoplasticscitations
- 2016Assessment of induction heated mould technologies for high-temperature thermoplastic composite manufacturing
- 2016Experimental analysis on the coupled effect between thermo-optical properties and microstructure of semi-crystalline thermoplasticscitations
- 2016Coupled heating-forming simulation of the thermoforming of thermoplastic composites
- 2016Identification of the temperature dependent relation between thermo-optical properties and morphology of semi-crystalline thermoplastics for thermoforming process
- 2010Melt state behaviour of PEEK and processing window interpretation for fast compression moulding process
- 2010Heterogeneous tensile behavior of impact-modified polypropylene plates processed by injection moulding
Places of action
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article
The role of microcrystalline structure on optical scattering characteristics of semi-crystalline thermoplastics and the accuracy of numerical input for IR-heating modeling
Abstract
Infrared (IR) heating is widely used for thermoforming of thermoplastic polymers. The key benefit of radiation heating is that a significant amount of the radiative energy penetrates into the polymers thanks to their semi-transparency. For the case of heating unfilled semi-crystalline polymers, the relation between their microcrystalline structure and optical properties is the key to develop a predictive IR-heating model as microcrystalline structure introduces an optically heterogeneous medium. In this study, a relation between the microcrystalline structure of a polyethylene (PE) and its effect on the thermo-optical properties was experimentally analyzed considering a two-step analysis. At very first step, the relation was analyzed considering samples with identical thicknesses and different morphologies, characterized here in terms of degree of crystallinity (Xc (%)). Using Fourier Transform Infrared (FT-IR) spectroscopy and integrating sphere, optical characteristics of the PE samples were analyzed in near-infrared (NIR) and middle-infrared (MIR) spectral ranges. The analyses showed that a slight variation in Xc (%) has a great effect on the optical characteristics of PE, particularly the transmission characteristics in NIR range. The wavelength-dependent effect of Xc (%) on the transmission behaviors opened a discussion about the fact that the microcrystalline structures -in particular spherulites or their substructures such as lamellae- are responsible for optical scattering. Using the optical properties obtained from the two-step experimental analyses, two different thermo-optical properties were calculated, namely extinction and absorption coefficients, and used as a numerical input for the parametric numerical studies. The numerical studies were performed using an in-house developed radiation heat transfer algorithm -RAYHEAT-. Both the experimental and numerical analyses demonstrated the importance of the optical scattering regarding the identification of thermo-optical properties, used as a numerical input for radiation heat transfer models.