Surface modification effects on the thermal stability of cellulose nanostructures obtained from lignocellulosic residues
In this work, it was studied the steric and electrostatic stabilization of cellulose nanostructures (CNS) and their effects on the thermal stability of the nanoparticles. Three different agents modified the surface of CNS: a grafted polymer, polyethylene glycol (PEG), a nonionic surfactant, Ultraric...
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Veröffentlicht in: | Journal of thermal analysis and calorimetry 2020-08, Vol.141 (4), p.1263-1277 |
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Sprache: | eng |
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Zusammenfassung: | In this work, it was studied the steric and electrostatic stabilization of cellulose nanostructures (CNS) and their effects on the thermal stability of the nanoparticles. Three different agents modified the surface of CNS: a grafted polymer, polyethylene glycol (PEG), a nonionic surfactant, Ultraric, and an anionic surfactant (Surfom). All modifications changed the dimensions of the nanoparticles, and the thermogravimetric results show an improvement in the thermal stability of the CNSs, that is, the thermal decomposition of cellulose increased from 326 to 341–366 °C for Surfom-modified samples, 348–389 °C for Ultraric-modified samples, and to 426–436 °C for PEG-modified samples. The differential scanning calorimetry showed that the Surfom-modified samples have no crystalline structure, different from the other modifiers. The other stabilizers showed a tendency to form a crystalline coating in the CNSs surface since all the results are highly dependent on the structure of the modified. In this way, it is possible to conclude that the addition of different materials to improve the stabilization of CNS and minimize its aggregation tendency has a significant influence on the thermal stability, enhancing the applicability of these nanomaterials. Finally, it is presented how the differences between the thermal behavior of the modified CNS impact the applications, comparing the use of different polymer matrices and its respective processing temperatures. |
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ISSN: | 1388-6150 1588-2926 |
DOI: | 10.1007/s10973-019-09109-4 |