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Cellulose

pp 1–13 | Cite as

Freeze dried cellulose nanocrystal reinforced unsaturated polyester composites: challenges and potential

  • Edward DiLoretoEmail author
  • Ejaz Haque
  • Arielle Berman
  • Robert J. Moon
  • Kyriaki Kalaitzidou
Original Research
  • 50 Downloads

Abstract

Functionalized cellulose particles were studied as a potential reinforcement for an unsaturated polyester resin (UPR) system, a common material for automotive applications of fiber reinforced plastics. A preliminary process for incorporating freeze-dried cellulose nanocrystal (CNC) powder into UPR was developed. Three surface chemistries were explored including sulfonated, methyl(triphenyl) phosphonium (PhCNC), and maleic acid (MCNC). By optical microscopy the filler was seen to be agglomerated within the matrix. Fractography showed that these agglomerates acted as stress concentration points resulting in decreased tensile and flexural strength. With the addition of 1 wt% CNCs, the flexural and tensile modulus increased by up to 53% and 22%, respectively. Dynamic mechanical analysis indicated that the PhCNC- and MCNC-UPR samples had a 61% and 66% higher glassy modulus than neat UPR, respectively. Despite the lack of nano-scale dispersion of CNC in UPR, these results reflect potential in the use of functionalized CNC agglomerates as an additive in UPR systems to produce composites with high moduli and good thermo-mechanical stability.

Keywords

Unsaturated polyester Cellulose nanocrystals Functionalized nanoparticles 

Notes

Acknowledgments

This work was supported by P3 Nano and the U.S. Endowment for Forestry and Communities. The authors would like to thank Prof. Douglas M. Fox from the American University and Prof. J.Y. Zhu from Forest Products Laboratory for providing the functionalized CNC studied in this work, as well as Reichhold for providing the polyester resin. The authors would also like to thank their colleagues at Georgia Tech, namely Prof. Jon Colton for providing mechanical testing equipment, Prof. Satish Kumar for providing the optical microscope, the staff of the Materials Characterization Facility, and Mr Nicholas Billeter and Mr Joshua Oswald for assisting with tensile and flexural measurements.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.School of Materials Science and EngineeringGeorgia Institute of TechnologyAtlantaUSA
  2. 2.Georgia Tech Manufacturing Institute, G.W. Woodruff School of Mechanical EngineeringAtlantaUSA
  3. 3.The Forest Products LaboratoryU.S. Forest ServiceMadisonUSA

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