Synergistic effects of cellulose nanocrystal on the mechanical and shape memory properties of TPU composites.
Int J Biol Macromol
; : 134842, 2024 Aug 17.
Article
em En
| MEDLINE
| ID: mdl-39159801
ABSTRACT
Cellulose nanocrystal is a nanomaterial that has a large specific surface area, high surface energy, and high strength. As well, it is biocompatible, environmentally friendly, nontoxic, and can be extracted from biomass resources. Because of these features, cellulose nanocrystals can be used to improve the mechanical properties of polymer matrices with a shape memory effect and as a shape memory switch. In this study, a polytrimethylene ether glycol-based thermoplastic polyurethane (TPU)/cellulose nanocrystal (CNC) composite was prepared via an in-situ polymerization process to create a self-healing polymer matrix. Also, the effect of CNC doses in low concentrations (≤2â¯wt%) on the different properties of the resulting bio-nanocomposite was investigated. The results showed that the introduction of CNCs affects the hydrogen bonding within the polymer matrix and provides better thermal stability in the high temperature range than pure TPU. Furthermore, the samples with 0â¯wt%, 0.75â¯wt%, 1â¯wt%, and 2â¯wt% of CNC exhibited an increasing trend in tensile strength with values of 11.71â¯MPa, 18.95â¯MPa, 17.88â¯MPa, and 26.18â¯MPa, respectively, which indicates a remarkable improvement in mechanical strength. The shape memory behavior was also notably prominent in this polymer composite, where the composite containing 2â¯wt% of CNC showed the fastest recovery time (240â¯s) at 75⯰C with the highest shape retention. Moreover, their flow behavior and deformation capacity were examined through rheology tests. Besides, docking simulations were conducted in silico to assess the interaction of the TPU/CNC composite with the DNA gyrase enzyme. The interaction between CNC/TPU composite and DNA gyrase was meticulously analyzed across 10 distinct conformations, yielding docking scores ranging from -6.5â¯Kcal/mol to -5.3â¯Kcal/mol. Overall, the physico-mechanical properties of the TPU/CNC composites were substantially enhanced with the incorporation of nanofillers.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Int J Biol Macromol
Ano de publicação:
2024
Tipo de documento:
Article