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One-step spraying achieved superhydrophobic fluoroSiO2@epoxy coating with corrosion-wear resistance and anti-wetting stability. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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Wu P, Peng Y, Zhang X, Zhang G, Ran J, Xu M. Unsaturated polyester resin modified with a novel reactive flame retardant: effects on thermal stability and flammability. JOURNAL OF POLYMER ENGINEERING 2022. [DOI: 10.1515/polyeng-2021-0317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
A new reactive flame retardant (DTA), containing phosphaphenanthrene and triazine-trione groups was synthesized and applied to improve the flame retardancy of unsaturated polyester resin. The thermal stability, flame retardancy and combustion behaviors of UP/DTA thermosets were detected by thermogravimeric analysis (TG), limited oxygen index (LOI), vertical burning (UL94) test and cone calorimeter test. According to the research results, the addition of DTA contributed to improving the flame retardancy of UP. After adding 20 wt% DTA, the LOI of UP composite increased from 19.0% of the neat UP to 26.6%, and UL94 rating reached V-0. In addition, compared with pure UP, the peak heat release rate (pk-HRR), average heat release rate (av-HRR) and total heat release rate (THR) of UP/DTA-20 thermosetting material decreased by 44.0, 26.2 and 29.5%, respectively. In the gaseous phase, DTA decomposed to generate nitrogen-containing fragments with diluting effect and phosphorus-containing free radicals with quenching effect to inhibit the combustion. In the condensed phase, phosphaphenanthrene group of DTA decomposed to generate phosphorus-based compounds, which promoted the carbonization of the UP matrix and cooperated with triazine-trione group to increase the char yield. Therefore, DTA plays an important role in flame retardancy in the gas and condensed phases.
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Affiliation(s)
- Piye Wu
- School of Materials Science and Engineering, Wuhan Institute of Technology , Wuhan 430205 , PR China
| | - Yongzhi Peng
- School of Materials Science and Engineering, Wuhan Institute of Technology , Wuhan 430205 , PR China
| | - Xiaomeng Zhang
- School of Materials Science and Engineering, Zhengzhou University , Zhengzhou , 450000 , PR China
| | - Gang Zhang
- School of Materials Science and Engineering, Wuhan Institute of Technology , Wuhan 430205 , PR China
- School of Mechanical and Electrical Engineering, Wuhan Institute of Technology , Wuhan , 430205 , PR China
| | - Jiabing Ran
- College of Biological and Pharmaceutical Sciences, China Three Gorges University , Yichang 443002 , China
| | - Man Xu
- School of Materials Science and Engineering, Wuhan Institute of Technology , Wuhan 430205 , PR China
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Wu S, Zhu Z, Liu C, Su Y, Wang F, Bai W, Sun H, Liang W, Li A. Facile preparation of composite flame retardantbased on conjugated microporous polymer hollow spheres. J Colloid Interface Sci 2021; 586:152-162. [PMID: 33183755 DOI: 10.1016/j.jcis.2020.10.080] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Revised: 10/19/2020] [Accepted: 10/20/2020] [Indexed: 10/23/2022]
Abstract
The development of functional materials with better flame-retardant and thermal insulation properties has attracted considerable attention for energy storage applications in modern society. Here, we describe a facile approach for the preparation of conjugated microporous polymer hollow spheres (CMP-HSs) by using SiO2 nanoparticles as a template via the Sonogashira-Hagihara cross-coupling reaction. The as-synthesized CMP-HSs have good thermal stability with a thermal decomposition temperature of up to 281 °C, high porosity (the BET specific surface area is measured to be approximately 666 m2 g-1) along with lipophilic and hydrophobic characteristics. To further improve their flame retardancy, CMP-HSs were treated with dimethyl phosphonate (DMMP) though an immersion method to prepare the CMP-HSs composite (CMP-HSs-DMMP) flame-retardants. By introducing CMP-HSs-DMMP into the epoxy resin (EP) matrix, the as-prepared EP composites showed excellent flame-retardant properties, e.g., the peak heat release rate (pHRR) and total heat release (THR) value of EP composites containing only 0.2% CMP-HSs-DMMP flame-retardant were 650.9 kW m-2 and 79.4 MJ m-2 respectively, in the range of 0 °C - 650 °C, which are 19.6 ± 2% and 19.1 ± 5% lower than that of pure EP within the same temperature range. Considering the significant enhancement of its flame retardancy with only a slight dosage of CMP-HSs-DMMP, such CMP hollow sphere-based flame-retardant composites may have great potential as functional bulk materials or coatings in a variety of fireproofing applications.
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Affiliation(s)
- Shujuan Wu
- Department of Chemical Engineering, College of Petrochemical Engineering, Lanzhou University of Technology, Langongping Road 287, Lanzhou 730050, PR China
| | - Zhaoqi Zhu
- Department of Chemical Engineering, College of Petrochemical Engineering, Lanzhou University of Technology, Langongping Road 287, Lanzhou 730050, PR China
| | - Chao Liu
- Department of Chemical Engineering, College of Petrochemical Engineering, Lanzhou University of Technology, Langongping Road 287, Lanzhou 730050, PR China
| | - Yanning Su
- Department of Chemical Engineering, College of Petrochemical Engineering, Lanzhou University of Technology, Langongping Road 287, Lanzhou 730050, PR China
| | - Fei Wang
- Department of Chemical Engineering, College of Petrochemical Engineering, Lanzhou University of Technology, Langongping Road 287, Lanzhou 730050, PR China
| | - Wei Bai
- Department of Chemical Engineering, College of Petrochemical Engineering, Lanzhou University of Technology, Langongping Road 287, Lanzhou 730050, PR China
| | - Hanxue Sun
- Department of Chemical Engineering, College of Petrochemical Engineering, Lanzhou University of Technology, Langongping Road 287, Lanzhou 730050, PR China
| | - Weidong Liang
- Department of Chemical Engineering, College of Petrochemical Engineering, Lanzhou University of Technology, Langongping Road 287, Lanzhou 730050, PR China
| | - An Li
- Department of Chemical Engineering, College of Petrochemical Engineering, Lanzhou University of Technology, Langongping Road 287, Lanzhou 730050, PR China.
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