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Title: Cellulose nanocrystal-reinforced poly(5-triethoxysilyl-2-norbornene) composites

Abstract

Here, we demonstrate the reinforcement of a previously inaccessible norbornene-silane with a stiff, bio-based nanofiller. Poly(5-triethoxysilyl-2-norbornene) (PTESN), a glassy and thermally stable polymer, was combined with cellulose nanocrystals (CNCs) and solvent cast from toluene to form reinforced materials. Composite films showed excellent translucency and no visible aggregation, which was supported by scanning electron micrographs that showed no signs of CNC aggregation within the polymer matrix. Reinforcement was evident at the moderate loading of 5 wt% CNC, showing a statistically significant enhancement for Young's modulus and even greater reinforcement for 20 wt% CNC loading for Young's modulus (540 MPa vs. 970 MPa) and storage modulus at 25 °C (400 MPa vs. 1200 MPa). We anticipate that there is a strong interaction between the polymer and CNC filler based upon the increase of thermal degradation temperature of the CNCs increasing, for example from 278 °C to 295 °C at 10 wt% CNCs. These interactions were probed via solid-state NMR, which suggests that no covalent bonding occurs between the triethoxylsilyl substituents of the polymer and the CNCs. We therefore hypothesize that hydrogen bonding interactions between PTESN and CNCs are responsible for the increased thermal stability and reinforcement of the polymer material.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [2]; ORCiD logo [1]
  1. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Univ. of Tennessee, Knoxville, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division
OSTI Identifier:
1595332
Alternate Identifier(s):
OSTI ID: 1566264
Grant/Contract Number:  
SC0018179
Resource Type:
Accepted Manuscript
Journal Name:
Polymer Chemistry
Additional Journal Information:
Journal Volume: 11; Journal Issue: 2; Journal ID: ISSN 1759-9954
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Hendren, Keith D., Higgins, Morgan A., Long, Brian K., and Foster, E. Johan. Cellulose nanocrystal-reinforced poly(5-triethoxysilyl-2-norbornene) composites. United States: N. p., 2019. Web. https://doi.org/10.1039/c9py00963a.
Hendren, Keith D., Higgins, Morgan A., Long, Brian K., & Foster, E. Johan. Cellulose nanocrystal-reinforced poly(5-triethoxysilyl-2-norbornene) composites. United States. https://doi.org/10.1039/c9py00963a
Hendren, Keith D., Higgins, Morgan A., Long, Brian K., and Foster, E. Johan. Wed . "Cellulose nanocrystal-reinforced poly(5-triethoxysilyl-2-norbornene) composites". United States. https://doi.org/10.1039/c9py00963a. https://www.osti.gov/servlets/purl/1595332.
@article{osti_1595332,
title = {Cellulose nanocrystal-reinforced poly(5-triethoxysilyl-2-norbornene) composites},
author = {Hendren, Keith D. and Higgins, Morgan A. and Long, Brian K. and Foster, E. Johan},
abstractNote = {Here, we demonstrate the reinforcement of a previously inaccessible norbornene-silane with a stiff, bio-based nanofiller. Poly(5-triethoxysilyl-2-norbornene) (PTESN), a glassy and thermally stable polymer, was combined with cellulose nanocrystals (CNCs) and solvent cast from toluene to form reinforced materials. Composite films showed excellent translucency and no visible aggregation, which was supported by scanning electron micrographs that showed no signs of CNC aggregation within the polymer matrix. Reinforcement was evident at the moderate loading of 5 wt% CNC, showing a statistically significant enhancement for Young's modulus and even greater reinforcement for 20 wt% CNC loading for Young's modulus (540 MPa vs. 970 MPa) and storage modulus at 25 °C (400 MPa vs. 1200 MPa). We anticipate that there is a strong interaction between the polymer and CNC filler based upon the increase of thermal degradation temperature of the CNCs increasing, for example from 278 °C to 295 °C at 10 wt% CNCs. These interactions were probed via solid-state NMR, which suggests that no covalent bonding occurs between the triethoxylsilyl substituents of the polymer and the CNCs. We therefore hypothesize that hydrogen bonding interactions between PTESN and CNCs are responsible for the increased thermal stability and reinforcement of the polymer material.},
doi = {10.1039/c9py00963a},
journal = {Polymer Chemistry},
number = 2,
volume = 11,
place = {United States},
year = {2019},
month = {9}
}

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