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Hierarchical Structured Polyimide–Silica Hybrid Nano/Microfiber Filters Welded by Solvent Vapor for Air Filtration

Electrospun polymer membranes were considered to be promising materials for fine particulate matter (PM) filtration. However, the poor mechanical properties of the electrospun membrane restricted their application for pressure-driven air filtration. Herein, strength-enhanced electrospun polyimide (P...

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Detalles Bibliográficos
Autores principales: Li, Dawei, Shen, Ying, Wang, Lanlan, Liu, Feng, Deng, Bingyao, Liu, Qingsheng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7693890/
https://www.ncbi.nlm.nih.gov/pubmed/33120971
http://dx.doi.org/10.3390/polym12112494
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author Li, Dawei
Shen, Ying
Wang, Lanlan
Liu, Feng
Deng, Bingyao
Liu, Qingsheng
author_facet Li, Dawei
Shen, Ying
Wang, Lanlan
Liu, Feng
Deng, Bingyao
Liu, Qingsheng
author_sort Li, Dawei
collection PubMed
description Electrospun polymer membranes were considered to be promising materials for fine particulate matter (PM) filtration. However, the poor mechanical properties of the electrospun membrane restricted their application for pressure-driven air filtration. Herein, strength-enhanced electrospun polyimide (PI) membranes were demonstrated via a synergistic approach. Solvent-vapor treatment was utilized to introduce extra bonding at the cross points of PI nanofiber, while SiO(2) nanoparticles (SiO(2) NPs) were used to reinforce the body of nanofibers. The mechanical strength and filtration performance of hybrid membranes could be regulated by adjusting the quantity of SiO(2) NPs. The tensile strength of the pure PI membrane was increased by 33% via adding 1.5% SiO(2) NPs, which was further promoted by 70% after solvent-vapor treatment. With a slight reduction in pressure drop (6.5%), the filtration efficiency was not greatly suppressed by welding the SiO(2) NP hybrid PI nanofibers. Moreover, the welded composite filter showed high particulate (0.3–1.0 μm) filtration efficiency (up to nearly 100%) and stable pressure drop throughout the 20 tested filtration cycles.
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spelling pubmed-76938902020-11-28 Hierarchical Structured Polyimide–Silica Hybrid Nano/Microfiber Filters Welded by Solvent Vapor for Air Filtration Li, Dawei Shen, Ying Wang, Lanlan Liu, Feng Deng, Bingyao Liu, Qingsheng Polymers (Basel) Article Electrospun polymer membranes were considered to be promising materials for fine particulate matter (PM) filtration. However, the poor mechanical properties of the electrospun membrane restricted their application for pressure-driven air filtration. Herein, strength-enhanced electrospun polyimide (PI) membranes were demonstrated via a synergistic approach. Solvent-vapor treatment was utilized to introduce extra bonding at the cross points of PI nanofiber, while SiO(2) nanoparticles (SiO(2) NPs) were used to reinforce the body of nanofibers. The mechanical strength and filtration performance of hybrid membranes could be regulated by adjusting the quantity of SiO(2) NPs. The tensile strength of the pure PI membrane was increased by 33% via adding 1.5% SiO(2) NPs, which was further promoted by 70% after solvent-vapor treatment. With a slight reduction in pressure drop (6.5%), the filtration efficiency was not greatly suppressed by welding the SiO(2) NP hybrid PI nanofibers. Moreover, the welded composite filter showed high particulate (0.3–1.0 μm) filtration efficiency (up to nearly 100%) and stable pressure drop throughout the 20 tested filtration cycles. MDPI 2020-10-27 /pmc/articles/PMC7693890/ /pubmed/33120971 http://dx.doi.org/10.3390/polym12112494 Text en © 2020 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Li, Dawei
Shen, Ying
Wang, Lanlan
Liu, Feng
Deng, Bingyao
Liu, Qingsheng
Hierarchical Structured Polyimide–Silica Hybrid Nano/Microfiber Filters Welded by Solvent Vapor for Air Filtration
title Hierarchical Structured Polyimide–Silica Hybrid Nano/Microfiber Filters Welded by Solvent Vapor for Air Filtration
title_full Hierarchical Structured Polyimide–Silica Hybrid Nano/Microfiber Filters Welded by Solvent Vapor for Air Filtration
title_fullStr Hierarchical Structured Polyimide–Silica Hybrid Nano/Microfiber Filters Welded by Solvent Vapor for Air Filtration
title_full_unstemmed Hierarchical Structured Polyimide–Silica Hybrid Nano/Microfiber Filters Welded by Solvent Vapor for Air Filtration
title_short Hierarchical Structured Polyimide–Silica Hybrid Nano/Microfiber Filters Welded by Solvent Vapor for Air Filtration
title_sort hierarchical structured polyimide–silica hybrid nano/microfiber filters welded by solvent vapor for air filtration
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7693890/
https://www.ncbi.nlm.nih.gov/pubmed/33120971
http://dx.doi.org/10.3390/polym12112494
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