Article
Chemistry, Multidisciplinary
Anying Zhang, Wenhui Wang, Zhenfeng Dong, Jianfei Wei, Lifei Wei, Weiwen Gu, Guo Zheng, Rui Wang
Summary: In this study, an antidroplet flame retardant system based on FRPET was developed by adding DOPO-POSS as an additive flame retardant. The results showed that DOPO-POSS improved the fire resistance and limiting oxygen index of FRPET, and also enhanced the combustion characteristics.
Article
Polymer Science
Wei Peng, Shi-bin Nie, Yu-xuan Xu, Wei Yang
Summary: The synthesis of tetra-DOPO compound enhanced the flame-retardant efficacy of epoxy thermosets without compromising their thermo-mechanical performances. The addition of 5.0 wt% of tetra-DOPO improved storage modulus, glass transition temperature, LOI, and UL-94 V-0 grade of the EP composite, demonstrating exceptional fire-retardant properties. The flame inhibition mechanism of tetra-DOPO was further elucidated through various tests, clarifying its role in both vapor and condensed phases.
POLYMER DEGRADATION AND STABILITY
(2021)
Article
Polymer Science
Wu Zhang, Weikang Xia, Yasheng Shi, Changlin Zhou, Ran Chen, Lei Wang, Jinqing Qu
Summary: In this study, a DOPO-anchored benzothiadiazole flame retardant (DOPO-BTD) was successfully designed and synthesized for flame-retarded epoxy thermosets. The incorporation of DOPO-BTD significantly improved the flame retardancy and thermal stability of the epoxy matrix. The results showed a significant reduction in peak heat release rate (PHRR), total heat release (THR), smoke production rate (SPR), total smoke production (TSP), and carbon monoxide production (COP) with the addition of DOPO-BTD. Furthermore, the flame-retarded mechanism of DOPO-BTD was confirmed through gas-phase and condensed-phase pathways. This study highlights the potential of P/N/S synergistic flame-retardants for the development of functional polymers.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2022)
Article
Polymer Science
Ya Chao Wang, Fan Li, Jiang Ping Zhao
Summary: A novel DOPO/flake graphite (FG) co-doped silica fume-based geopolymer coating was developed for flame-retarding plywood, aiming to achieve a halogen-free and low-carbon Si-C-P fireproof method. The appropriate addition of DOPO (1 wt%) enhanced the flame retardancy, reducing the heat release rate and increasing the flame retardancy index. The fire-retardant mechanism consisted of water volatilization, formation of carbonaceous layer, transformations of DOPO, formation of DOPO derivatives, and decomposition of DOPO derivatives.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Polymer Science
Tingting Liu, Feng Wang, Gen Li, Peng Liu, Chong Gao, Yanfen Ding, Shimin Zhang, Xiangrong Kong, Mingshu Yang
Summary: MH nanoparticles were successfully grafted with DOPO through WD70 to improve flame retardancy in EVA. The grafted MH nanoparticles showed better dispersion and enhanced properties in EVA nanocomposites. This study offers a novel method to enhance flame-retardant efficiency while maintaining mechanical properties in polymer materials.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Review
Chemistry, Applied
Yunxian Yang, De-Yi Wang, Rong-Kun Jian, Zhiqi Liu, Guangyan Huang
Summary: This article reviews the research progress of epoxy resin derivatives synthesized from DOPO structure with different substituents at the phosphorus atom in the last decade. The relationship between chemical structure and properties, as well as the effect of these compounds on the properties of epoxy resin, including flame retardance, heat resistance, and mechanical properties, are discussed. However, there are still some issues that need to be improved, such as flame retardant migration, deterioration of mechanical properties, processibility, and economic competitiveness.
PROGRESS IN ORGANIC COATINGS
(2023)
Article
Polymer Science
Florian Tomiak, Angelina Schoeffel, Klaus Rathberger, Dietmar Drummer
Summary: This study investigates a flame retardant system based on expandable graphite, aluminum diethylphosphinate, and melamine polyphosphate in glass fiber-reinforced polyamide 6. The burning characteristics were evaluated using various tests, and the decomposition process and flame retardant modes of action were studied. The results show that formulations containing expandable graphite have excellent flame retardant properties in both non-reinforced and reinforced polyamide 6. The study also reveals the impact of glass fiber content on the flame retardant performance.
Article
Polymer Science
Dongyue Liu, Pengfei Ji, Tianlong Zhang, Jipeng Lv, Yihua Cui
Summary: A bi-DOPO type prepolymer was successfully synthesized for flame retardancy epoxy resins, showing excellent flame retardancy with high limiting oxygen index and V-0 rating in UL-94, as well as remarkable smoke suppression and flame inhibition. The phosphaphenanthrene groups in the prepolymer contributed to the improvement of flame retardant performance, while the rigid structure of DOBP molecules increased the tensile modulus of the cured epoxy resins.
POLYMER DEGRADATION AND STABILITY
(2021)
Article
Polymer Science
Boyu Cai, Qing Jiang, Wendi Xu, Luze Wang, Zhonglin Luo, Biaobing Wang
Summary: In this study, a nitrogen-rich DOPO-based phosphoramide (DPAPZ) was synthesized and blended with polycarbonate (PC) to improve fire safety and smoke suppression. DPAPZ released phosphorus-containing free radicals in the gas phase and formed a protective layer in the condensed phase, which effectively inhibited combustion. The addition of DPAPZ reduced the heat release rate and improved the fire rating of the PC/DPAPZ composites.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Polymer Science
Hu Rong, Yong Guo, Zhongwei Chen, Tingting Chen, Yuan Yu, Chunlei He, Jing Zhou, Xuliang Liu, Qingwu Zhang, Yajie Bu, Juncheng Jiang
Summary: A novel reactive flame retardant, PPDA, was synthesized by neutralizing PPOA with ODA. When incorporated into EP alongside DOPO, EP/PPDA/DOPO composite exhibited excellent flame retardancy and reduced heat release rate, smoke production, and total heat release. The presence of organic phosphorus structures and non-flammable nitrogen compounds contributed to its superior performance. PPDA/DOPO is a promising halogen-free alternative for flame retardants.
POLYMER DEGRADATION AND STABILITY
(2023)
Article
Chemistry, Multidisciplinary
Junhua Ding, Jinggang Wang, Weihong Cao, Huajun Zheng, Zhenghong Guo, Zhengping Fang, Peng Chen, Juan Li
Summary: A bio-based phosphonate, DPGE, was synthesized and used to enhance the flame retardancy of PEFT20. PEFT20 containing 8 wt% DPGE exhibited excellent flame retardant properties with a UL-94 V0 rating and a limiting oxygen index of 29.8 vol %. The mechanical performance of PEFT20/DPGE was regulated by incorporating TGIC, which improved the flexural and impact strengths of the blend but also counteracted the melting-away effect caused by DPGE, resulting in a decrease in flame retardancy.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Polymer Science
Ze-Nian Wang, Shui-Long Shen, Annan Zhou, Hai-Min Lyu
Summary: This study investigates the mechanical, flame-retarding, and creep-recovery proprieties of ethylene-propylene-diene monomer (EPDM) composites filled with nano-Mg(OH)(2) or nano-Al(OH)(3). The results show that nano-Mg(OH)(2) or nano-Al(OH)(3) can enhance the flame-retarding and creep resistance properties of the composites. However, the tensile strength and elongation at break show an initial increase followed by a decrease with increasing content of nano-Mg(OH)(2) or nano-Al(OH)(3). The Findley power law and the Weibull distribution function demonstrate good correspondence with the results of creep-recovery tests for EPDM composites.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Shengda Wang, Shenghui Lou, Penghui Fan, Li Ma, Jie Liu, Tao Tang
Summary: In order to enhance the flame-retardant performance of epoxy thermosets while maintaining other properties, a new aromatic imine-containing DOPO-based bisphenol, DOPO-AI, was synthesized. When the mass of DOPO-AI was 25% of DGEBA, the resulting epoxy thermoset EP/20DOPO-AI exhibited excellent flame-retardant properties, showing V-0 rating with a limiting oxygen index of 35.4%. In addition, EP/20DOPO-AI also showed a reduction in heat release and an increase in char-forming ability.
POLYMER DEGRADATION AND STABILITY
(2023)
Article
Engineering, Multidisciplinary
Mengwei Tao, Lijun Qian, Jingyu Wang, Hui Zhu, Wei Tang, Yajun Chen, Wang Xi, Yong Qiu
Summary: A series of nonhalogen block copolymer flame retardants PAPO-MP were designed and synthesized to explore new flame retardant molecules with higher flame retardancy and toughening effect. Compared with the physically blended intumescent flame retardant, the mechanical properties of block copolymer 24(7PAPO-3MP)/76PP were greatly increased, with impact strength and elongation at break increased by 166% and 965% respectively.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Fan Li, Yachao Wang, Mengyao Lai, Jiangping Zhao
Summary: A novel organic-inorganic hybrid coating, MPP@LS@FG-ACC, has been synthesized for flame-retarding plywood using the sol-gel method. The coating improves the flame retardancy of cenospheres by transforming into nonflammable resilient residues during burning, resulting in a reduction in heat release rate and smoke production. The research also proposes an efficient approach for reusing cenospheres and improving the flame retardancy of building materials derived from cenospheres.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Polymer Science
Zhongming Yuan, Hiroko Yamamoto, Shinji Kanehashi, Takeshi Shimomura
Summary: This study reports the synthesis of a flexible light-emitting polymer film using a solution blending method. The selective positioning of MEH-PPV molecules in the PS phase of the film was confirmed. The film exhibited a nanometer-scale luminescent domain with low aggregation quenching and showed good elastomeric characteristics.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2024)
