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Cellulose

, Volume 26, Issue 9, pp 5363–5379 | Cite as

Effects of bentonite on physical, mechanical and barrier properties of cellulose nanofibril hybrid films for packaging applications

  • Michelle Zheng
  • Mehdi TajvidiEmail author
  • Ali H. Tayeb
  • Nicole M. Stark
Original Research

Abstract

There is an increasing attention to cellulose nanofibrils (CNFs) for food packaging applications due to their abundance, biodegradability, and low gas permeability. In this work, oxygen and water barrier performance is studied for bio-nanocomposite films formed by incorporation of two types of bentonite (PGN and PGV) at different loads (15, 30 and 45 wt%) into continuous CNF matrix. The resulting hybrid films were analyzed for their morphology, surface energy, mechanical strengths as well as water/oxygen barrier qualities. Both types of bentonite lowered the CNF degradation temperature and strength to some degree for reasons not so clear but perhaps due to partial disruption of the CNF H-bond network. It was revealed from microscopic study that clay particles form a layer within cellulose chains, resulting in alteration of composite structure. The contact angle analysis by polar and nonpolar liquids, suggested the PGN-containing samples were more hydrophilic; clay induced polar functionalities to the composite. While 15% PGN load reduced the water vapor transmission rate from 425 to 375 g/m2 day, higher proportions of bentonite negatively affected this trend. Also, analysis of oxygen transmission rate showed the PGN effectively restricted the oxygen passage in dry state and to a lower extent at higher relative humidity. In WVTR analysis, PGN showed a superior performance over PGV attributable to its crystalline structure as evident in XRD patterns. The proposed hybrid CNF-BNT films in this study can present an eco-friendly alternative in packaging materials, especially where penetration of water vapor and oxygen is to be avoided.

Graphical abstract

Keywords

Cellulose nanofibrils Bentonite Composite films Nanoclay Water vapor permeability Oxygen transmission rate Food packaging Barrier films 

Abbreviations

CNFs

Cellulose nanofibrils

DCC

Dicarboxylic acid cellulose nanofibers

TGA

Thermogravimetric analysis

SEM

Scanning electron microscope

AFM

Atomic force microscope

WVTR

Water vapor transmission rate

WVP

Water vapor permeability

OTR

Oxygen transmission rate

Notes

Acknowledgments

Funding for this study was provided by NSF REU Project #1461116 through the University of Maine’s Forest Bioproducts Research Institute.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.University of Southern CaliforniaLos AngelesUSA
  2. 2.School of Forest Resources and Advanced Structures and Composites CenterUniversity of MaineOronoUSA
  3. 3.School of Forest Resources and Advanced Structures and Composites CenterUniversity of MaineOronoUSA
  4. 4.USDA Forest Products Laboratory, One Gifford Pinchot DriveMadisonUSA

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