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Chen Q, Huo S, Lu Y, Ding M, Feng J, Huang G, Xu H, Sun Z, Wang Z, Song P. Heterostructured Graphene@Silica@Iron Phenylphosphinate for Fire-Retardant, Strong, Thermally Conductive Yet Electrically Insulated Epoxy Nanocomposites. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2310724. [PMID: 38429241 DOI: 10.1002/smll.202310724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Revised: 01/27/2024] [Indexed: 03/03/2024]
Abstract
The portfolio of extraordinary fire retardancy, mechanical properties, dielectric/electric insulating performances, and thermal conductivity (λ) is essential for the practical applications of epoxy resin (EP) in high-end industries. To date, it remains a great challenge to achieve such a performanceportfolio in EP due to their different and even mutually exclusive governing mechanisms. Herein, a multifunctional additive (G@SiO2@FeHP) is fabricated by in situ immobilization of silica (SiO2) and iron phenylphosphinate (FeHP) onto the graphene (G) surface. Benefiting from the synergistic effect of G, SiO2 and FeHP, the addition of 1.0 wt% G@SiO2@FeHP enables EP to achieve a vertical burning (UL-94) V-0 rating and a limiting oxygen index (LOI) of 30.5%. Besides, both heat release and smoke generation of as-prepared EP nanocomposite are significantly suppressed due to the condensed-phase function of G@SiO2@FeHP. Adding 1.0 wt% G@SiO2@FeHP also brings about 44.5%, 61.1%, and 42.3% enhancements in the tensile strength, tensile modulus, and impact strength of EP nanocomposite. Moreover, the EP nanocomposite exhibits well-preserved dielectric and electric insulating properties and significantly enhanced λ. This work provides an integrated strategy for the development of multifunctional EP materials, thus facilitating their high-performance applications.
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Affiliation(s)
- Qiang Chen
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, No.1 Xikang Road, Nanjing, 210098, China
| | - Siqi Huo
- Centre for Future Materials, University of Southern Queensland, Springfield, 4300, Australia
| | - Yixia Lu
- Centre for Future Materials, University of Southern Queensland, Springfield, 4300, Australia
| | - Mingmei Ding
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, No.1 Xikang Road, Nanjing, 210098, China
| | - Jiabing Feng
- China-Australia Institute for Advanced Materials and Manufacturing, Jiaxing University, Jiaxing, 314001, China
| | - Guobo Huang
- School of Pharmaceutical and Materials Engineering, Taizhou University, 1139 Shifu Road, Taizhou, 318000, China
| | - Hang Xu
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, No.1 Xikang Road, Nanjing, 210098, China
| | - Ziqi Sun
- School of Mechanical, Medical and Process Engineering, School of Chemistry and Physics, Queensland University of Technology, 2 George Street, Brisbane, QLD, 4001, Australia
| | - Zhengzhou Wang
- School of Materials Science and Engineering, Tongji University, Shanghai, 201804, China
- Key Laboratory of Advanced Civil Engineering Materials (Tongji University), Ministry of Education, Shanghai, 201804, China
| | - Pingan Song
- Centre for Future Materials, University of Southern Queensland, Springfield, 4300, Australia
- School of Agriculture and Environmental Science, University of Southern Queensland, Springfield, 4300, Australia
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Dun L, Ouyang Z, Sun Q, Yue X, Wu G, Li B, Kang W, Wang Y. A Simple and Efficient Magnesium Hydroxide Modification Strategy for Flame-Retardancy Epoxy Resin. Polymers (Basel) 2024; 16:1471. [PMID: 38891418 PMCID: PMC11174588 DOI: 10.3390/polym16111471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2024] [Revised: 05/14/2024] [Accepted: 05/15/2024] [Indexed: 06/21/2024] Open
Abstract
Magnesium hydroxide, as a green inorganic flame-retardancy additive, has been widely used in polymer flame retardancy. However, magnesium hydroxide is difficult to disperse with epoxy resin (EP), and its flame-retardancy performance is poor, so it is difficult to use in flame-retardant epoxy resin. In this study, an efficient magnesium hydroxide-based flame retardant (MH@PPAC) was prepared by surface modification of 2-(diphenyl phosphine) benzoic acid (PPAC) using a simple method. The effect of MH@PPAC on the flame-retardancy properties for epoxy resins was investigated, and the flame-retardancy mechanism was studied. The results show that 5 wt% MH@PPAC can increase the limiting oxygen index for EP from 24.1% to 38.9%, achieving a V-0 rating. At the same time, compared to EP, the peak heat release rate, peak smoke production rate, total smoke production rate, and peak CO generation rate for EP/5 wt% MH@PPAC composite material decreased by 53%, 45%, 51.85%, and 53.13% respectively. The cooperative effect for PPAC and MH promotes the formation of a continuous and dense char layer during the combustion process for the EP-blend material, significantly reducing the exchange for heat and combustible gases, and effectively hindering the combustion process. Additionally, the surface modification of PPAC enhances the dispersion of MH in the EP matrix, endowing EP with superior mechanical properties that meet practical application requirements, thereby expanding the application scope for flame-retardant EP-blend materials.
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Affiliation(s)
- Linan Dun
- College of Materials Science and Engineering, Northeastern University, Shenyang 110004, China; (L.D.); (Q.S.)
- Hofmann Institute of Advanced Materials, Shenzhen Polytechnic, Shenzhen 518055, China; (Z.O.); (X.Y.); (G.W.); (B.L.)
| | - Zeen Ouyang
- Hofmann Institute of Advanced Materials, Shenzhen Polytechnic, Shenzhen 518055, China; (Z.O.); (X.Y.); (G.W.); (B.L.)
| | - Qihao Sun
- College of Materials Science and Engineering, Northeastern University, Shenyang 110004, China; (L.D.); (Q.S.)
| | - Xiaoju Yue
- Hofmann Institute of Advanced Materials, Shenzhen Polytechnic, Shenzhen 518055, China; (Z.O.); (X.Y.); (G.W.); (B.L.)
| | - Guodong Wu
- Hofmann Institute of Advanced Materials, Shenzhen Polytechnic, Shenzhen 518055, China; (Z.O.); (X.Y.); (G.W.); (B.L.)
| | - Bohan Li
- Hofmann Institute of Advanced Materials, Shenzhen Polytechnic, Shenzhen 518055, China; (Z.O.); (X.Y.); (G.W.); (B.L.)
| | - Weidong Kang
- Jinxi Industries Group Co., Ltd., Taiyuan 030000, China;
| | - Yuanhao Wang
- College of Materials Science and Engineering, Northeastern University, Shenyang 110004, China; (L.D.); (Q.S.)
- Hofmann Institute of Advanced Materials, Shenzhen Polytechnic, Shenzhen 518055, China; (Z.O.); (X.Y.); (G.W.); (B.L.)
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Zou Y, Cui W, Chen D, Luo F, Li H. In Situ-Generated Heat-Resistant Hydrogen-Bonded Organic Framework for Remarkably Improving Both Flame Retardancy and Mechanical Properties of Epoxy Composites. ACS APPLIED MATERIALS & INTERFACES 2023; 15:47463-47474. [PMID: 37750712 DOI: 10.1021/acsami.3c09197] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/27/2023]
Abstract
In this study, the heat-resistant hydrogen-bonded organic framework (HOF) material HOF-FJU-1 was synthesized via in situ generation and then used as flame retardants (FRs) to improve the flame retardancy of epoxy resin (EP). HOF-FJU-1 can maintain high crystallinity at 450 °C and thus function as a flame retardant in EP. The study found that HOF-FJU-1 facilitates the improvement of char formation in EP, thus inhibiting heat transfer and smoke release during combustion. For EP/HOF-FJU-1 composites, the in situ-generated HOF-FJU-1 can remarkably improve both the mechanical properties and the flame retardancy of EP. Furthermore, the in situ-generated HOF-FJU-1 has better fire safety than the ex situ-generated HOF-FJU-1 at the same filling content. Thermal degradation products and flame retardation mechanisms in the gas and condensed phases were further investigated. This work demonstrates that the in situ-generated HOF-FJU-1 is promising to be an excellent flame-retardant candidate.
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Affiliation(s)
- Yingbing Zou
- Engineering Research Center of polymer Green Recycling of Ministry of Education, College of Environment and Resource science, Fujian Normal University, Fuzhou 350007, China
| | - Wenqi Cui
- Engineering Research Center of polymer Green Recycling of Ministry of Education, College of Environment and Resource science, Fujian Normal University, Fuzhou 350007, China
| | - Denglong Chen
- Quangang Petrochemical Research Institute, Fujian Normal University, Quanzhou 362801, China
| | - Fubin Luo
- Engineering Research Center of polymer Green Recycling of Ministry of Education, College of Environment and Resource science, Fujian Normal University, Fuzhou 350007, China
| | - Hongzhou Li
- Engineering Research Center of polymer Green Recycling of Ministry of Education, College of Environment and Resource science, Fujian Normal University, Fuzhou 350007, China
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Hu P, Li W, Huang S, Zhang Z, Liu H, Zhan W, Chen M, Kong Q. Effect of Layered Aminovanadic Oxalate Phosphate on Flame Retardancy of Epoxy Resin. Molecules 2023; 28:molecules28083322. [PMID: 37110556 PMCID: PMC10142990 DOI: 10.3390/molecules28083322] [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: 03/06/2023] [Revised: 03/31/2023] [Accepted: 04/07/2023] [Indexed: 04/29/2023] Open
Abstract
To alleviate the fire hazard of epoxy resin (EP), layered ammonium vanadium oxalate-phosphate (AVOPh) with the structural formula of (NH4)2[VO(HPO4)]2(C2O4)·5H2O is synthesized using the hydrothermal method and mixed into an EP matrix to prepare EP/AVOPh composites. The thermogravimetric analysis (TGA) results show that AVOPh exhibits a similar thermal decomposition temperature to EP, which is suitable for flame retardancy for EP. The incorporation of AVOPh nanosheets greatly improves the thermal stability and residual yield of EP/AVOPh composites at high temperatures. The residue of pure EP is 15.3% at 700 °C. In comparison, the residue of EP/AVOPh composites is increased to 23.0% with 8 wt% AVOPh loading. Simultaneously, EP/6 wt% AVOPh composites reach UL-94 V1 rating (t1 + t2 =16 s) and LOI value of 32.8%. The improved flame retardancy of EP/ AVOPh composites is also proven by the cone calorimeter test (CCT). The results of CCT of EP/8 wt% AVOPh composites show that the peak heat release rate (PHHR), total smoke production (TSP), peak of CO production (PCOP), and peak of CO2 production (PCO2P) decrease by 32.7%, 20.4%, 37.1%, and 33.3% compared with those of EP, respectively. This can be attributed to the lamellar barrier, gas phase quenching effect of phosphorus-containing volatiles, the catalytic charring effect of transition metal vanadium, and the synergistic decomposition of oxalic acid structure and charring effect of phosphorus phase, which can insulate heat and inhibit smoke release. Based on the experimental data, AVOPh is expected to serve as a new high-efficiency flame retardant for EP.
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Affiliation(s)
- Po Hu
- School of Emergency Management, Jiangsu University, Zhenjiang 212013, China
| | - Weixi Li
- School of Emergency Management, Jiangsu University, Zhenjiang 212013, China
| | - Shuai Huang
- School of Emergency Management, Jiangsu University, Zhenjiang 212013, China
| | - Zongmian Zhang
- School of Emergency Management, Jiangsu University, Zhenjiang 212013, China
| | - Hong Liu
- School of Emergency Management, Jiangsu University, Zhenjiang 212013, China
| | - Wang Zhan
- School of Emergency Management, Jiangsu University, Zhenjiang 212013, China
| | - Mingyi Chen
- School of Emergency Management, Jiangsu University, Zhenjiang 212013, China
| | - Qinghong Kong
- School of Emergency Management, Jiangsu University, Zhenjiang 212013, China
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