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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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Schick, Christoph
University of Rostock
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (15/15 displayed)
- 2022Bulk enthalpy of melting of Poly (l-lactic acid) (PLLA) determined by fast scanning chip calorimetry
- 2021Crystal Nucleation and Growth in Cross-Linked Poly(ε-caprolactone) (PCL)citations
- 2021Nucleation behaviour and microstructure of single Al-Si12 powder particles rapidly solidified in a fast scanning calorimetercitations
- 2020Stability of crystal nuclei of poly (butylene isophthalate) formed near the glass transition temperature
- 2019Differential fast scanning calorimetry as analytical tool for mimicking melting and solidification in additive manufacturing
- 2019The Effect of Backbone Rigidity on the Glass Transition of Polymers of Intrinsic Microporosity Probed by Fast Scanning Calorimetrycitations
- 2019Enthalpy relaxation of polyamide 11 of different morphology far below the glass transition temperature
- 2019Review of the quench sensitivity of aluminium alloys: analysis of the kinetics and nature of quench-induced precipitationcitations
- 2018Cold-crystallization of poly(butylene 2,6-naphthalate) following Ostwald's rule of stagescitations
- 2017Determination of the glass transition temperature of difficult samples by Flash DSC
- 2015Control of precipitation during heat treatments based on DSC experiments
- 2015Temperature dependency of nucleation efficiency of carbon nanotubes in PET and PBTcitations
- 2014Crystallization of poly(ε-caprolactone)/MWCNT composites: a combined SAXS/WAXS, electrical and thermal conductivity studycitations
- 2014Kinetics of nucleation and crystallization in poly(butylene succinate) nanocompositescitations
- 2013Competitive crystallization of a propylene/ethylene random copolymer filled with a β-nucleating agent and multi-walled carbon nanotubes. conventional and ultrafast DSC studycitations
Places of action
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article
Crystallization of poly(ε-caprolactone)/MWCNT composites: a combined SAXS/WAXS, electrical and thermal conductivity study
Abstract
In situ crystallization of poly(ε-caprolactone) (PCL) filled with different contents (0.2–5 wt%) of multiwalled carbon nanotubes (MWCNTs) was investigated in X-ray (SAXS/WAXS) synchrotron experiments simultaneously with thermal and electric conductivity measurements. The combined study provides information on nucleation ability of MWCNT, crystallization and melting kinetics, degree of crystallinity as well as the evolution of thermal diffusivity and electrical conductivity of PCL/MWCNT composites during isothermal and non-isothermal crystallization. In both, non-isothermal and isothermal experiments, MWCNTs act as strong nucleation agents. Two separate melting peaks in calorimetric experiments indicate (i) nucleation by the nanotubes and (ii) heterogeneous nucleation by the polymer itself. WAXS shows identical local crystal structure (unit cell) for both and a similar degree of the total crystallinity independent of thermal treatment and relative fraction. The crystallization kinetics of crystals nucleated by MWCNT is much faster and the crystallization and melting temperatures are higher than those for the neat PCL. By isothermal crystallization at higher temperatures (here: T = 327 K) the heterogeneous nucleation of the polymer itself can be suppressed and in the length scale of SAXS experiments no indication of periodic lamella stacks was detected. Electrical conductivity measurements performed simultaneously with SAXS/WAXS during isothermal crystallization showed for MWCNT contents above 0.5 wt% an increase in electrical conductivity by more than one order of magnitude, which can be related to the formation of a conductive nanotube network. At the same time, thermal conductivity of the composite is increasing only slightly, which is rather related to the increase of the crystalline phase than to heat transfer in a percolated structure. The dependence of thermal conductivity on MWCNT content can be related to the addition of filler with high thermal conductance and does not show a simple correlation to the ...