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Zheng L, Wang M, Li Y, Xiong Y, Wu C. Recycling and Degradation of Polyamides. Molecules 2024; 29:1742. [PMID: 38675560 PMCID: PMC11052090 DOI: 10.3390/molecules29081742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2024] [Revised: 03/31/2024] [Accepted: 04/10/2024] [Indexed: 04/28/2024] Open
Abstract
As one of the five major engineering plastics, polyamide brings many benefits to humans in the fields of transportation, clothing, entertainment, health, and more. However, as the production of polyamide increases year by year, the pollution problems it causes are becoming increasingly severe. This article reviews the current recycling and treatment processes of polyamide, such as chemical, mechanical, and energy recovery, and degradation methods such as thermal oxidation, photooxidation, enzyme degradation, etc. Starting from the synthesis mechanism of polyamide, it discusses the advantages and disadvantages of different treatment methods of polyamide to obtain more environmentally friendly and economical treatment schemes. Finding enzymes that can degrade high-molecular-weight polyamides, exploring the recovery of polyamides under mild conditions, synthesizing environmentally degradable polyamides through copolymerization or molecular design, and finally preparing degradable bio-based polyamides may be the destination of polyamide.
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Affiliation(s)
- Lin Zheng
- Hubei Provincial Key Laboratory of Green Materials for Light Industry, Collaborative Innovation Center of Green Light-Weight Materials and Processing, New Materials and Green Manufacturing Talent Introduction and Innovation Demonstration Base, School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China; (L.Z.); (M.W.); (Y.L.); (Y.X.)
| | - Mengjin Wang
- Hubei Provincial Key Laboratory of Green Materials for Light Industry, Collaborative Innovation Center of Green Light-Weight Materials and Processing, New Materials and Green Manufacturing Talent Introduction and Innovation Demonstration Base, School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China; (L.Z.); (M.W.); (Y.L.); (Y.X.)
| | - Yaoqin Li
- Hubei Provincial Key Laboratory of Green Materials for Light Industry, Collaborative Innovation Center of Green Light-Weight Materials and Processing, New Materials and Green Manufacturing Talent Introduction and Innovation Demonstration Base, School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China; (L.Z.); (M.W.); (Y.L.); (Y.X.)
| | - Yan Xiong
- Hubei Provincial Key Laboratory of Green Materials for Light Industry, Collaborative Innovation Center of Green Light-Weight Materials and Processing, New Materials and Green Manufacturing Talent Introduction and Innovation Demonstration Base, School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China; (L.Z.); (M.W.); (Y.L.); (Y.X.)
- Hubei Longzhong Laboratory, Xiangyang 441000, China
| | - Chonggang Wu
- Hubei Provincial Key Laboratory of Green Materials for Light Industry, Collaborative Innovation Center of Green Light-Weight Materials and Processing, New Materials and Green Manufacturing Talent Introduction and Innovation Demonstration Base, School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China; (L.Z.); (M.W.); (Y.L.); (Y.X.)
- Hubei Longzhong Laboratory, Xiangyang 441000, China
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Zhu R, Pu Z, Hou H, Li X, Wang X, Yu D, Zheng P, Wu F, Zhong J. Effect of copolymerization on the thermal characteristics and behavior of crystallization of biobased semi‐aromatic
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10I. J Appl Polym Sci 2023. [DOI: 10.1002/app.53903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/07/2023]
Affiliation(s)
- Rongli Zhu
- School of Materials Science and Engineering, Material Corrosion and Protection Key Laboratory of Sichuan Province Sichuan University of Science & Engineering Zigong China
| | - Zejun Pu
- School of Materials Science and Engineering, Material Corrosion and Protection Key Laboratory of Sichuan Province Sichuan University of Science & Engineering Zigong China
| | - Hongbo Hou
- School of Materials Science and Engineering, Material Corrosion and Protection Key Laboratory of Sichuan Province Sichuan University of Science & Engineering Zigong China
| | - Xianyong Li
- School of Materials Science and Engineering, Material Corrosion and Protection Key Laboratory of Sichuan Province Sichuan University of Science & Engineering Zigong China
| | - Xu Wang
- School of Materials Science and Engineering, Material Corrosion and Protection Key Laboratory of Sichuan Province Sichuan University of Science & Engineering Zigong China
| | - Dayang Yu
- School of Materials Science and Engineering, Material Corrosion and Protection Key Laboratory of Sichuan Province Sichuan University of Science & Engineering Zigong China
| | - Pan Zheng
- School of Materials Science and Engineering, Material Corrosion and Protection Key Laboratory of Sichuan Province Sichuan University of Science & Engineering Zigong China
| | - Fang Wu
- School of Materials Science and Engineering, Material Corrosion and Protection Key Laboratory of Sichuan Province Sichuan University of Science & Engineering Zigong China
| | - Jiachun Zhong
- School of Materials Science and Engineering, Material Corrosion and Protection Key Laboratory of Sichuan Province Sichuan University of Science & Engineering Zigong China
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Gonzalez de Gortari M, Misra M, Mohanty AK. Polyphthalamide polymers: A review on synthesis, properties, and advance manufacturing and emerging applications. J Appl Polym Sci 2022. [DOI: 10.1002/app.52965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Mateo Gonzalez de Gortari
- School of Engineering, Thornbrough Building University of Guelph Guelph Ontario Canada
- Bioproducts Discovery and Development Centre, Department of Plant Agriculture, Crop Science Building University of Guelph Guelph Ontario Canada
| | - Manjusri Misra
- School of Engineering, Thornbrough Building University of Guelph Guelph Ontario Canada
- Bioproducts Discovery and Development Centre, Department of Plant Agriculture, Crop Science Building University of Guelph Guelph Ontario Canada
| | - Amar K. Mohanty
- School of Engineering, Thornbrough Building University of Guelph Guelph Ontario Canada
- Bioproducts Discovery and Development Centre, Department of Plant Agriculture, Crop Science Building University of Guelph Guelph Ontario Canada
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Feng H, Li D, Cheng B, Song T, Yang R. A cross-linked charring strategy for mitigating the hazards of smoke and heat of aluminum diethylphosphonate/polyamide 6 by caged octaphenyl polyhedral oligomeric silsesquioxanes. JOURNAL OF HAZARDOUS MATERIALS 2022; 424:127420. [PMID: 34736179 DOI: 10.1016/j.jhazmat.2021.127420] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Revised: 09/19/2021] [Accepted: 10/01/2021] [Indexed: 06/13/2023]
Abstract
Aluminum diethylphosphonate (ADP) is a highly efficient phosphorus-based flame retardant, widely used in polyamide 6 (PA6). However, ADP/PA6 releases large amounts of heat and smoke under high heat flux, which commonly means serious hazards to life and property. Octaphenyl polyhedral oligomeric silsesquioxanes (OPS) is an organic-inorganic hybrid silicon compound, playing flame retardant role in condensed phase. In this work, combustion behaviors of OPS/ADP/PA6 were investigated by limited oxygen index (LOI), UL94 and cone calorimeter (CONE) tests. The LOI and UL94 rating results did not change obviously, while the CONE data and smoke density data showed the synergistic effect of OPS and ADP in PA6. For 2.5%OPS/7.5%ADP/PA6, the peak values of heat, smoke and CO release rate (pk-HRR, pk-RSR, Ds, max with/without pilot flame and pk-COP) decreased by 60.2%, 82.1%, 45.9%/38.3% and 80.4% respectively, compared with 10%ADP/PA6. Moreover, 2.5%OPS/7.5%ADP/PA6 produced 337.5% more residue than 10%ADP/PA6. TGA, TG-IR, SEM-EDS, XPS and py-GC/MS were used to further explore the synergistic mechanism of OPS and ADP. It was verified that the cross-linked charring strategy apparently has weakened the hazards of smoke and heat of PA6. This work proposed a possible technical approach to solve both fire risk and heat/smoke hazards of PA6.
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Affiliation(s)
- Haisheng Feng
- National Engineering Research Center of Flame Retardant Materials, School of Materials Science and Engineering, Beijing Institute of Technology, 5 South, Zhongguancun Street, Haidian District, 100081 Beijing, PR China; School of Fire Protection Engineering, China People's Police University, 220 Xichang Road, Anci District, 065000 Langfang, PR China
| | - Dinghua Li
- National Engineering Research Center of Flame Retardant Materials, School of Materials Science and Engineering, Beijing Institute of Technology, 5 South, Zhongguancun Street, Haidian District, 100081 Beijing, PR China.
| | - Bo Cheng
- National Engineering Research Center of Flame Retardant Materials, School of Materials Science and Engineering, Beijing Institute of Technology, 5 South, Zhongguancun Street, Haidian District, 100081 Beijing, PR China
| | - Tinglu Song
- National Engineering Research Center of Flame Retardant Materials, School of Materials Science and Engineering, Beijing Institute of Technology, 5 South, Zhongguancun Street, Haidian District, 100081 Beijing, PR China
| | - Rongjie Yang
- National Engineering Research Center of Flame Retardant Materials, School of Materials Science and Engineering, Beijing Institute of Technology, 5 South, Zhongguancun Street, Haidian District, 100081 Beijing, PR China.
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