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Carbohydr Polym. 2017 Oct 1;173:50-56. doi: 10.1016/j.carbpol.2017.05.089. Epub 2017 May 29.

Polyethylene cellulose nanofibrils nanocomposites.

Author information

1
Universidade Federal de São Carlos, Departamento de Engenharia de Materiais, Rodovia Washington Luís, km 235, CEP 13565-905, São Carlos, SP, Brazil.
2
Universidade Federal de São Carlos, Departamento de Física, Química e Matemática Sorocaba, SP, Brazil.
3
Swiss Federal Laboratories for Materials Science and Technology, Zurich, Switzerland.
4
Université Grenoble Alpes, LGP2, F-38000, France; CNRS, LGP2, F-38000, France.
5
The Dow Chemical Company, São Paulo, SP, Brazil.
6
Universidade Federal de São Carlos, Departamento de Engenharia de Materiais, Rodovia Washington Luís, km 235, CEP 13565-905, São Carlos, SP, Brazil. Electronic address: alucas@ufscar.br.

Abstract

This paper investigates the use of an aqueous dispersion of polyethylene copolymer with a relatively high content of acrylic acid as a compatibilizer and as an alternative medium to obtain polyethylene CNF nanocomposites. The CNF content was varied from 1 to 90wt% and the appearance, optical, thermal, mechanical and rheological properties, as well the morphology of the films were evaluated. The PE/CNF films are transparent up to 20wt% of NFC indicating a good dispersion of CNF, but a poor distribution, with PE-rich and CNF-rich regions observed by SEM. Improved mechanical properties were achieved, with a 100% and 15,900% increase in the Young's modulus with 1wt% and 90wt% NFC, respectively. The rheological behavior indicated good melt processability. According to these results, aqueous polyolefin dispersions seem to be a promising, easy and relatively fast route for obtaining cellulose/polyolefins nanocomposites with low to high contents of cellulose nanofibrils.

KEYWORDS:

Cellulose nanofibrils; Nanocomposite films; Optical properties; Polyethylene; Rheology; Tensile properties

PMID:
28732893
DOI:
10.1016/j.carbpol.2017.05.089
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