Nanocomposites with functionalised polysaccharide nanocrystals through aqueous free radical polymerisation promoted by ozonolysis.
Identifieur interne : 001A66 ( Main/Merge ); précédent : 001A65; suivant : 001A67Nanocomposites with functionalised polysaccharide nanocrystals through aqueous free radical polymerisation promoted by ozonolysis.
Auteurs : E. Espino-Pérez [République populaire de Chine] ; Robert G. Gilbert [République populaire de Chine] ; S. Domenek [France] ; M C Brochier-Salon [France] ; M N Belgacem [France] ; J. Bras [France]Source :
- Carbohydrate polymers [ 1879-1344 ] ; 2016.
Descripteurs français
- KwdFr :
- MESH :
English descriptors
- KwdEn :
- MESH :
- chemical , chemistry : Cellulose, Hydrogen Peroxide, Ozone, Polystyrenes, Starch.
- chemistry : Nanocomposites, Nanoparticles.
- Polymerization.
Abstract
Cellulose nanocrystals (CNC) and starch nanocrystals (SNC) were grafted by ozone-initiated free-radical polymerisation of styrene in a heterogeneous medium. Surface functionalisation was confirmed by infrared spectroscopy, contact angle measurements, and thermogravimetric and elemental analysis. X-ray diffraction and scanning electron microscopy showed that there was no significant change in the morphology or crystallinity of the nanoparticles following ozonolysis. The grafting efficiency, quantified by (13)C NMR, was greater for SNC, with a styrene/anhydroglucose ratio of 1.56 compared to 0.25 for CNC. The thermal stability improved by 100°C. The contact angles were 97° and 78° following the SNC and CNC grafting, respectively, demonstrating the efficiency of the grafting in changing the surface properties even at low levels of surface substitution. The grafting increased the compatibility with the polylactide, and produced nanocomposites with improved water vapour barrier properties. Ozone-mediated grafting is thus a promising approach for surface functionalisation of polysaccharide nanocrystals.
DOI: 10.1016/j.carbpol.2015.09.005
PubMed: 26453876
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pubmed:26453876Le document en format XML
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<series><title level="j">Carbohydrate polymers</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Cellulose (chemistry)</term>
<term>Hydrogen Peroxide (chemistry)</term>
<term>Nanocomposites (chemistry)</term>
<term>Nanoparticles (chemistry)</term>
<term>Ozone (chemistry)</term>
<term>Polymerization</term>
<term>Polystyrenes (chemistry)</term>
<term>Starch (chemistry)</term>
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<keywords scheme="KwdFr" xml:lang="fr"><term>Amidon ()</term>
<term>Cellulose ()</term>
<term>Nanocomposites ()</term>
<term>Nanoparticules ()</term>
<term>Ozone ()</term>
<term>Peroxyde d'hydrogène ()</term>
<term>Polymérisation</term>
<term>Polystyrènes ()</term>
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<keywords scheme="MESH" type="chemical" qualifier="chemistry" xml:lang="en"><term>Cellulose</term>
<term>Hydrogen Peroxide</term>
<term>Ozone</term>
<term>Polystyrenes</term>
<term>Starch</term>
</keywords>
<keywords scheme="MESH" qualifier="chemistry" xml:lang="en"><term>Nanocomposites</term>
<term>Nanoparticles</term>
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<keywords scheme="MESH" xml:lang="en"><term>Polymerization</term>
</keywords>
<keywords scheme="MESH" xml:lang="fr"><term>Amidon</term>
<term>Cellulose</term>
<term>Nanocomposites</term>
<term>Nanoparticules</term>
<term>Ozone</term>
<term>Peroxyde d'hydrogène</term>
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<front><div type="abstract" xml:lang="en">Cellulose nanocrystals (CNC) and starch nanocrystals (SNC) were grafted by ozone-initiated free-radical polymerisation of styrene in a heterogeneous medium. Surface functionalisation was confirmed by infrared spectroscopy, contact angle measurements, and thermogravimetric and elemental analysis. X-ray diffraction and scanning electron microscopy showed that there was no significant change in the morphology or crystallinity of the nanoparticles following ozonolysis. The grafting efficiency, quantified by (13)C NMR, was greater for SNC, with a styrene/anhydroglucose ratio of 1.56 compared to 0.25 for CNC. The thermal stability improved by 100°C. The contact angles were 97° and 78° following the SNC and CNC grafting, respectively, demonstrating the efficiency of the grafting in changing the surface properties even at low levels of surface substitution. The grafting increased the compatibility with the polylactide, and produced nanocomposites with improved water vapour barrier properties. Ozone-mediated grafting is thus a promising approach for surface functionalisation of polysaccharide nanocrystals.</div>
</front>
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