Issue

Vol. 17 (2025)

Highly Thermal Conductive and Electromagnetic Shielding Polymer Nanocomposites from Waste Masks

https://doi.org/10.1007/s40820-025-01796-z
Xilin Zhang
State Key Laboratory of Efficient Production of Forest Resources and MOE Key Laboratory of Wood Material Science and Application, Beijing Forestry University, Beijing 100083, People’s Republic of China
Wenlong Luo
State Key Laboratory of Efficient Production of Forest Resources and MOE Key Laboratory of Wood Material Science and Application, Beijing Forestry University, Beijing 100083, People’s Republic of China
Yanqiu Chen
State Key Laboratory of Efficient Production of Forest Resources and MOE Key Laboratory of Wood Material Science and Application, Beijing Forestry University, Beijing 100083, People’s Republic of China
Qinghua Guo
State Key Laboratory of Efficient Production of Forest Resources and MOE Key Laboratory of Wood Material Science and Application, Beijing Forestry University, Beijing 100083, People’s Republic of China
Jing Luo
College of Materials Science and Engineering, Nanjing Forestry University, Xuanwu District, Longpan Road 159, Nanjing 210037, People’s Republic of China
Paulomi Burey
Centre for Future Materials, School of Agriculture and Environmental Science, University of Southern Queensland, Springfield 4300, Australia
Yangyang Gao
State Key Laboratory of Organic‑Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
Yonglai Lu
State Key Laboratory of Organic‑Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
Qiang Gao
State Key Laboratory of Efficient Production of Forest Resources and MOE Key Laboratory of Wood Material Science and Application, Beijing Forestry University, Beijing 100083, People’s Republic of China
Jingchao Li
State Key Laboratory of Efficient Production of Forest Resources and MOE Key Laboratory of Wood Material Science and Application, Beijing Forestry University, Beijing 100083, People’s Republic of China
Jianzhang Li
State Key Laboratory of Efficient Production of Forest Resources and MOE Key Laboratory of Wood Material Science and Application, Beijing Forestry University, Beijing 100083, People’s Republic of China
Pingan Song
Centre for Future Materials, School of Agriculture and Environmental Science, University of Southern Queensland, Springfield 4300, Australia

Corresponding Author: Pingan Song

pingansong@gmail.com

Nano-Micro Letters, Vol. 17 (2025), Article Number: 263

Abstract

Over 950 billion (about 3.8 million tons) masks have been consumed in the last four years around the world to protect human beings from COVID-19 and air pollution. However, very few of these used masks are being recycled, with the majority of them being landfilled or incinerated. To address this issue, we propose a repurposing upcycling strategy by converting these polypropylene (PP)-based waste masks to high-performance thermally conductive nanocomposites (PP@G, where G refers to graphene) with exceptional electromagnetic interference shielding property. The PP@G is fabricated by loading tannic acid onto PP fibers via electrostatic self-assembling, followed by mixing with graphene nanoplatelets (GNPs). Because this strategy enables the GNPs to form efficient thermal and electrical conduction pathways along the PP fiber surface, the PP@G shows a high thermal conductivity of 87 W m⁻1 K⁻1 and exhibits an electromagnetic interference shielding effectiveness of 88 dB (1100 dB cm−1), making it potentially applicable for heat dissipation and electromagnetic shielding in advanced electronic devices. Life cycle assessment and techno-economic assessment results show that our repurposing strategy has significant advantages over existing methods in reducing environmental impacts and economic benefits. This strategy offers a facile and promising approach to upcycling/repurposing of fibrous waste plastics.


Highlights:
1 Fabricating low-cost, high-performance, scalable polypropylene (PP)@graphene (G) nanocomposites from recycled PP fibers in waste masks by a simple electrostatic self-assembly hot-pressing method.
2 The resultant PP@G presents a high thermal conductivity of 87 W m−1 K−1 and a high electromagnetic interference shielding effectiveness of 88 dB (1100 dB cm−1).

Keywords

Mask waste Repurposing Thermal conductivity Electromagnetic interference shielding Life cycle assessment
Zhang, Xilin, Wenlong Luo, Yanqiu Chen, Qinghua Guo, Jing Luo, Paulomi Burey, Yangyang Gao, Yonglai Lu, Qiang Gao, Jingchao Li, Jianzhang Li, and Pingan Song. 2025. “Highly Thermal Conductive and Electromagnetic Shielding Polymer Nanocomposites from Waste Masks”. Nano-Micro Letters 17 (May):263. https://doi.org/10.1007/s40820-025-01796-z.
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