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Preparation and Closed-Loop Recycling of Ultra-High-Filled Wood Flour/Dynamic Polyurethane Composites

The development of biomass-based composites has greatly reduced the daily consumption of plastics. However, these materials are rarely recyclable, thus, posing a severe threat to the environment. Herein, we designed and prepared novel composite materials with ultra-high biomass (i.e., wood flour) fi...

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Autores principales: Guo, Shiyu, Wang, Huanbo, Liu, Yue, Fu, Yuan, Zhang, Xuefeng, Qi, Bin, Liu, Tian
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10058823/
https://www.ncbi.nlm.nih.gov/pubmed/36987198
http://dx.doi.org/10.3390/polym15061418
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author Guo, Shiyu
Wang, Huanbo
Liu, Yue
Fu, Yuan
Zhang, Xuefeng
Qi, Bin
Liu, Tian
author_facet Guo, Shiyu
Wang, Huanbo
Liu, Yue
Fu, Yuan
Zhang, Xuefeng
Qi, Bin
Liu, Tian
author_sort Guo, Shiyu
collection PubMed
description The development of biomass-based composites has greatly reduced the daily consumption of plastics. However, these materials are rarely recyclable, thus, posing a severe threat to the environment. Herein, we designed and prepared novel composite materials with ultra-high biomass (i.e., wood flour) filling capacity and good closed-loop recycling properties. The dynamic polyurethane polymer was polymerized in situ on the surface of wood fiber, and then they were hot-pressed into composites. Fourier-transform infrared (FTIR), scanning electron microscopy (SEM), and dynamic thermomechanical analysis (DMA) measurements reveal good compatibility between the polyurethane and wood flour in the composites when the wood flour content is ≤80 wt%. The maximum tensile and bending strength of the composite are 37 and 33 MPa when the wood flour content is 80%. The higher wood flour content results in higher thermal expansion stability and creep resistance in the composites. Moreover, the thermal debonding of dynamic phenol–carbamate bonds facilitates the composites to undergo physical and chemical cycling. The recycled and remolded composites exhibit good mechanical property recovery rates and retain the chemical structures of the original composites.
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spelling pubmed-100588232023-03-30 Preparation and Closed-Loop Recycling of Ultra-High-Filled Wood Flour/Dynamic Polyurethane Composites Guo, Shiyu Wang, Huanbo Liu, Yue Fu, Yuan Zhang, Xuefeng Qi, Bin Liu, Tian Polymers (Basel) Article The development of biomass-based composites has greatly reduced the daily consumption of plastics. However, these materials are rarely recyclable, thus, posing a severe threat to the environment. Herein, we designed and prepared novel composite materials with ultra-high biomass (i.e., wood flour) filling capacity and good closed-loop recycling properties. The dynamic polyurethane polymer was polymerized in situ on the surface of wood fiber, and then they were hot-pressed into composites. Fourier-transform infrared (FTIR), scanning electron microscopy (SEM), and dynamic thermomechanical analysis (DMA) measurements reveal good compatibility between the polyurethane and wood flour in the composites when the wood flour content is ≤80 wt%. The maximum tensile and bending strength of the composite are 37 and 33 MPa when the wood flour content is 80%. The higher wood flour content results in higher thermal expansion stability and creep resistance in the composites. Moreover, the thermal debonding of dynamic phenol–carbamate bonds facilitates the composites to undergo physical and chemical cycling. The recycled and remolded composites exhibit good mechanical property recovery rates and retain the chemical structures of the original composites. MDPI 2023-03-13 /pmc/articles/PMC10058823/ /pubmed/36987198 http://dx.doi.org/10.3390/polym15061418 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Guo, Shiyu
Wang, Huanbo
Liu, Yue
Fu, Yuan
Zhang, Xuefeng
Qi, Bin
Liu, Tian
Preparation and Closed-Loop Recycling of Ultra-High-Filled Wood Flour/Dynamic Polyurethane Composites
title Preparation and Closed-Loop Recycling of Ultra-High-Filled Wood Flour/Dynamic Polyurethane Composites
title_full Preparation and Closed-Loop Recycling of Ultra-High-Filled Wood Flour/Dynamic Polyurethane Composites
title_fullStr Preparation and Closed-Loop Recycling of Ultra-High-Filled Wood Flour/Dynamic Polyurethane Composites
title_full_unstemmed Preparation and Closed-Loop Recycling of Ultra-High-Filled Wood Flour/Dynamic Polyurethane Composites
title_short Preparation and Closed-Loop Recycling of Ultra-High-Filled Wood Flour/Dynamic Polyurethane Composites
title_sort preparation and closed-loop recycling of ultra-high-filled wood flour/dynamic polyurethane composites
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10058823/
https://www.ncbi.nlm.nih.gov/pubmed/36987198
http://dx.doi.org/10.3390/polym15061418
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