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Title: Responsive lignin for shape memory applications

Abstract

Here, we analyze thermally unstable lignin linkages that generate reactive sites and promote crosslinking reactions during thermal annealing at 180 °C. This results in significantly enhanced glass transition temperature (Tg). We use these characteristics of lignin to enhance interfacial reactivity of a lignin-based multiphase polymer synthesized by a dynamic shear process. An approximately 18 °C increase in Tg and more than 230% increase in storage modulus (E') are achieved by thermally annealing the 50 wt% hardwood lignin-nitrile rubber composite for 5 h at 180 °C. Tunable chemical and physical crosslinks within lignin and rubber resulted in shape programmability demonstrating excellent strain recovery of the synthesized renewable materials. The substantial improvement of the elastic work density of the lignin-based elastomers allows a broader applicable stress window for stress/strain sensing. The renewable materials also exhibit a better strain recovery after thermal annealing.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1492184
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Polymer
Additional Journal Information:
Journal Volume: 160; Journal Issue: C; Journal ID: ISSN 0032-3861
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Thermo-responsive lignin; Shape memory polymer; Elastomer; Shear-induced crosslinking; Thermal activation

Citation Formats

Nguyen, Ngoc A., Meek, Kelly M., Bowland, Christopher C., and Naskar, Amit K. Responsive lignin for shape memory applications. United States: N. p., 2018. Web. doi:10.1016/j.polymer.2018.11.055.
Nguyen, Ngoc A., Meek, Kelly M., Bowland, Christopher C., & Naskar, Amit K. Responsive lignin for shape memory applications. United States. doi:10.1016/j.polymer.2018.11.055.
Nguyen, Ngoc A., Meek, Kelly M., Bowland, Christopher C., and Naskar, Amit K. Tue . "Responsive lignin for shape memory applications". United States. doi:10.1016/j.polymer.2018.11.055. https://www.osti.gov/servlets/purl/1492184.
@article{osti_1492184,
title = {Responsive lignin for shape memory applications},
author = {Nguyen, Ngoc A. and Meek, Kelly M. and Bowland, Christopher C. and Naskar, Amit K.},
abstractNote = {Here, we analyze thermally unstable lignin linkages that generate reactive sites and promote crosslinking reactions during thermal annealing at 180 °C. This results in significantly enhanced glass transition temperature (Tg). We use these characteristics of lignin to enhance interfacial reactivity of a lignin-based multiphase polymer synthesized by a dynamic shear process. An approximately 18 °C increase in Tg and more than 230% increase in storage modulus (E') are achieved by thermally annealing the 50 wt% hardwood lignin-nitrile rubber composite for 5 h at 180 °C. Tunable chemical and physical crosslinks within lignin and rubber resulted in shape programmability demonstrating excellent strain recovery of the synthesized renewable materials. The substantial improvement of the elastic work density of the lignin-based elastomers allows a broader applicable stress window for stress/strain sensing. The renewable materials also exhibit a better strain recovery after thermal annealing.},
doi = {10.1016/j.polymer.2018.11.055},
journal = {Polymer},
number = C,
volume = 160,
place = {United States},
year = {2018},
month = {11}
}

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