一种含有P/N-Triazine的新型环状阻燃剂的合成及其在环氧树脂中的应用
Yi Yu1, Junlei Chen1, Anxin Ding2
1School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.
Polymers
|April 13, 2024
概括
一种新型阻燃剂VDPD被合成为环氧树脂 (EPs). 它有效地提高了V-0水平的阻燃性,并降低了峰值热释放率,同时保持机械性能.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物化学 聚合物化学
- 阻燃性是指阻燃性是指阻燃性.
背景情况:
- 环氧树脂 (EP) 对于特定的应用需要增强的阻燃性.
- 环境保护需要开发更安全的阻燃材料.
研究的目的:
- 合成一种新的含有三环的DOPO衍生化合物 (VDPD).
- 使用VDPD开发一种阻燃环氧树脂 (FREP).
- 在固化,热稳定性,机械性能和阻燃性方面评估FREP的性能.
主要方法:
- 从香草素,2,4-Diamino-6-phenyl-1,3,5-triazine和9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) 中合成VDPD的一个.
- 通过将VDPD纳入EP并用4,4-二氨基二甲 (DDM) 固化来制备FREP.
- 测试固化行为,热稳定性,机械性能 (拉伸强度,模量) 和阻燃性 (UL-94垂直燃烧,限制氧指数 (LOI),圆热量计测试 (CCT)).
主要成果:
- 加入VDPD提高了阻燃性,在0.4重量%的P含量下获得V-0等级和33.1%的LOI.
- 修改后的EP的峰值热释放率 (PHRR) 与整洁的EP相比下降了32%.
- 机械性能在很大程度上保持不变,拉伸强度略有下降,从80.2 MPa降至74.3 MPa,拉伸模量增加.
结论:
- VDPD是环氧树脂的有效阻燃剂.
- 合成的VDPD可以提高阻燃性,但不会显著损害机械完整性.
- 这种新型阻燃剂为符合环境要求的高性能环氧树脂应用提供了有前途的解决方案.
相关概念视频
Acid-Catalyzed Ring-Opening of Epoxides
7.3K
Epoxides that are three-membered ring systems are more reactive than other cyclic and acyclic ethers. The high reactivity of epoxides originates from the strain present in the ring. This ring strain acts as a driving force for epoxides to undergo ring-opening reactions either with halogen acids or weak nucleophiles in the presence of mild acid. The acid catalyst converts the epoxide oxygen, a poor leaving group, into an oxonium ion, a better leaving group, making the reaction feasible. The...
7.3K
Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene
6.0K
Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
6.0K
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)
2.6K
Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
2.6K
Base-Catalyzed Ring-Opening of Epoxides
8.4K
Due to their highly strained structures, epoxides can readily undergo ring-opening reactions through nucleophilic substitution, either in the presence of an acid or a base. The nucleophilic substitution reactions in the presence of acid are called acid-catalyzed ring-opening reactions, and nucleophilic substitution reactions in the presence of a base are called base-catalyzed ring-opening reactions. Epoxides undergo base-catalyzed ring-opening reactions in the presence of a strong nucleophile...
8.4K
Diazonium Group Substitution: –OH and –H
2.8K
Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
2.8K
Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions
1.9K
Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...
1.9K


