Crystallization of Polytetrafluoroethylene in a Wide Range of Cooling Rates: Nucleation and Diffusion in the Presence of Nanosilica Clusters

Polytetrafluoroethylene (PTFE) is a polymer that displays exceptional properties. This synthetic fluoropolymer is also known to crystallize very fast upon cooling. The present work highlights for the first time the influence of nanosilica clusters on PTFE crystallization at fast cooling rates (up to...

Celý popis

Uložené v:
Podrobná bibliografia
Vydané v:Molecules (Basel, Switzerland) Ročník 24; číslo 9; s. 1797 - 1816
Hlavní autori: Bosq, Nicolas, Guigo, Nathanaël, Persello, Jacques, Sbirrazzuoli, Nicolas
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Switzerland MDPI AG 09.05.2019
MDPI
Edícia:Special Issue "Polymer Composites and Nanocomposites with Enhanched Properties
Predmet:
Calorimetry, Differential Scanning
Chemical Sciences
Cold Temperature
Cooling
Crystallization
crystallization kinetics
Dielectric properties
Diffusion
Fluorine
Fourier transforms
Investigations
isoconversional analysis
Kinetics
Magnetic Resonance Spectroscopy
Material chemistry
Mechanical properties
Microscopy
Morphology
nanocomposite
Nanocomposites
Nanoparticles - chemistry
Nanoparticles - ultrastructure
NMR
Nuclear magnetic resonance
Polymers
polytetrafluoroethylene
Polytetrafluoroethylene - chemistry
silica
Silicon Dioxide - chemistry
Spectroscopy, Fourier Transform Infrared
Spectrum analysis
Surface Properties
Temperature
isoconversional analysis
nanocomposite
silica
crystallization kinetics
polytetrafluoroethylene
ISSN:1420-3049, 1420-3049
On-line prístup:Získať plný text
Tagy: Pridať tag
Žiadne tagy, Buďte prvý, kto otaguje tento záznam!
Popis
Shrnutí:Polytetrafluoroethylene (PTFE) is a polymer that displays exceptional properties. This synthetic fluoropolymer is also known to crystallize very fast upon cooling. The present work highlights for the first time the influence of nanosilica clusters on PTFE crystallization at fast cooling rates (up to 5000 K·s−1). The silica was synthesized from aqueous silicate solution and the surface modification was performed using TriEthoxyFluoroSilane (TEFS). In order to understand the crystallization behavior of PTFE/silica nanocomposite at a fast cooling rate, the measurements were carried out by Fast Scanning Calorimetry (FSC). The data were consequently combined with the measurements performed by conventional Differential Scanning Calorimetry (DSC). Interestingly, the results displayed variation of the crystallization behavior for the nanocomposite at fast cooling rates compared to slow cooling rates. The differences in crystal morphologies were then observed by Scanning Electron Microscopy (SEM) after slow and fast cooling rates. Finally, the effective activation energies (Eα) obtained from the crystallization under various cooling rates were combined in order to obtain one set of Hoffman-Lauritzen parameters. This procedure allowed us to show that the crystallization of PTFE in the presence of silica is promoted or hampered according to the cooling rates employed.
Bibliografia:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
content type line 23
PMCID: PMC6539400
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules24091797