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Title: A tough and sustainable fiber-forming material from lignin and waste poly(ethylene terephthalate)

Abstract

In this report we describe repurposing of recycled polyesters as a matrix for lignin-a biorefinery coproduct that is used as a solid fuel and needs to find higher value-to make sustainable high-performance thermoplastic materials. Brittle lignin oligomers, isolated from plant biomass, require a low-melting host polymer matrix to form a rigid and tough renewable material. We demonstrate controlled lignin dispersion and interfacial interactions in softened recycled polyethylene terephthalate (PET) using a simple solvent-free, melt-blending technique. To avoid lignin degradation and devolatilization during melt processing, it was thermally treated. Tall oil fatty acid was used to enable PET processability at low enough temperature to accommodate lignin without charring. Chemical analysis reveals reduction of aliphatic hydroxyl content from 2 mmol g–1 to 1.63 mmol g–1 and an increase of total phenolic hydroxyl moieties from 5.86 to 6.64 mmol g–1 and cleavage of β-O-4 ether linkages due to thermal treatment. Structural transformation of lignin macromolecules during heat treatment was further confirmed by an increase in molar mass and improved thermal stability. Interfacial interactions between lignin and PET were assessed from mechanical properties and thermal analyses. Thermal treatment not only helps to improve the stability of lignin but also slightly reduces the size ofmore » the dispersed lignin domains via favored interfacial interactions with the PET matrix. These methods improve mechanical properties of the material. Further, incorporation of lignin in the plasticized PET matrix increases the ductility in the blended products. Here, the method we discuss here utilizes industrial wastes and co-products, and it does not require solvent or toxic chemicals during the reactive extrusion process that yields complete conversion to products.« less

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [1];  [1]; ORCiD logo [1]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. 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:
1607066
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
RSC Advances
Additional Journal Information:
Journal Volume: 9; Journal Issue: 54; Journal ID: ISSN 2046-2069
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Akato, Kokouvi M., Nguyen, Ngoc A., Rajan, Kalavathy, Harper, David P., and Naskar, Amit K. A tough and sustainable fiber-forming material from lignin and waste poly(ethylene terephthalate). United States: N. p., 2019. Web. https://doi.org/10.1039/c9ra07052d.
Akato, Kokouvi M., Nguyen, Ngoc A., Rajan, Kalavathy, Harper, David P., & Naskar, Amit K. A tough and sustainable fiber-forming material from lignin and waste poly(ethylene terephthalate). United States. https://doi.org/10.1039/c9ra07052d
Akato, Kokouvi M., Nguyen, Ngoc A., Rajan, Kalavathy, Harper, David P., and Naskar, Amit K. Tue . "A tough and sustainable fiber-forming material from lignin and waste poly(ethylene terephthalate)". United States. https://doi.org/10.1039/c9ra07052d. https://www.osti.gov/servlets/purl/1607066.
@article{osti_1607066,
title = {A tough and sustainable fiber-forming material from lignin and waste poly(ethylene terephthalate)},
author = {Akato, Kokouvi M. and Nguyen, Ngoc A. and Rajan, Kalavathy and Harper, David P. and Naskar, Amit K.},
abstractNote = {In this report we describe repurposing of recycled polyesters as a matrix for lignin-a biorefinery coproduct that is used as a solid fuel and needs to find higher value-to make sustainable high-performance thermoplastic materials. Brittle lignin oligomers, isolated from plant biomass, require a low-melting host polymer matrix to form a rigid and tough renewable material. We demonstrate controlled lignin dispersion and interfacial interactions in softened recycled polyethylene terephthalate (PET) using a simple solvent-free, melt-blending technique. To avoid lignin degradation and devolatilization during melt processing, it was thermally treated. Tall oil fatty acid was used to enable PET processability at low enough temperature to accommodate lignin without charring. Chemical analysis reveals reduction of aliphatic hydroxyl content from 2 mmol g–1 to 1.63 mmol g–1 and an increase of total phenolic hydroxyl moieties from 5.86 to 6.64 mmol g–1 and cleavage of β-O-4 ether linkages due to thermal treatment. Structural transformation of lignin macromolecules during heat treatment was further confirmed by an increase in molar mass and improved thermal stability. Interfacial interactions between lignin and PET were assessed from mechanical properties and thermal analyses. Thermal treatment not only helps to improve the stability of lignin but also slightly reduces the size of the dispersed lignin domains via favored interfacial interactions with the PET matrix. These methods improve mechanical properties of the material. Further, incorporation of lignin in the plasticized PET matrix increases the ductility in the blended products. Here, the method we discuss here utilizes industrial wastes and co-products, and it does not require solvent or toxic chemicals during the reactive extrusion process that yields complete conversion to products.},
doi = {10.1039/c9ra07052d},
journal = {RSC Advances},
number = 54,
volume = 9,
place = {United States},
year = {2019},
month = {10}
}

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