http://www.cnr.it/ontology/cnr/individuo/prodotto/ID18107
Morphological and Thermal Properties of Cellulose-Montmorillonite Nanocomposites (Articolo in rivista)
- Type
- Label
- Morphological and Thermal Properties of Cellulose-Montmorillonite Nanocomposites (Articolo in rivista) (literal)
- Anno
- 2008-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1021/bm8002946 (literal)
- Alternative label
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- P. Cerruti; C. Carfagna; V. Ambrogi; A. Postiglione; J. Rychly; L. Matisova-Rychla (literal)
- Pagina inizio
- Pagina fine
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
- http://pubs.acs.org/doi/abs/10.1021/bm8002946 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Note
- Scopus (literal)
- ISI Web of Science (WOS) (literal)
- Google Scholar (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Istituto di Chimica e Tecnologia dei Polimeri (literal)
- Titolo
- Morphological and Thermal Properties of Cellulose-Montmorillonite Nanocomposites (literal)
- Abstract
- Cellulose-layered montmorillonite (MMT) nanocomposites were prepared by precipitation from /N/-methylmorpholine-/N/-oxide
(NMMO)/water solutions. Two hybrid samples were obtained to investigate
the influence of the reaction time on the extent of clay dispersion
within the matrix. It was observed that longer contact times are needed
to yield nanocomposites with a partially exfoliated morphology. The
thermal and thermal oxidative properties of the hybrids, which might be
of interest for fire-resistant final products, were investigated by
thermogravimetry and chemiluminescence (CL). The nanocomposites
exhibited increased degradation temperatures compared to plain
cellulose, and the partially exfoliated sample showed the maximum
stability. This result was explained in terms of hindered transfer of
heat, oxygen, and degraded volatiles due to the homogeneously dispersed
clay filler. Kinetic analysis of the decomposition process showed that
the degradation of regenerated cellulose and cellulose-based hybrids
occurred through a multistep mechanism. Moreover, the presence of
nanoclay led to drastic changes in the dependence of the activation
energy on the degree of degradation. CL analysis showed that longer
permanence in NMMO/water solutions brought about the formation of
carbonyl compounds on the polymer backbone. Moreover, MMT increased the
rate of dehydration and oxidation of cellulose functional moieties. As
a consequence, cellulose was found to be less stable at temperatures
lower than 100 °C. Conversely, at higher temperatures, the hindering of
oxygen transfer prevailed, determining an increase in thermo-oxidative
stability.. (literal)
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