用Friedel-Crafts乙基化进行表面修饰的聚乙基 (PEEK) 的新型碳氧化方法
Xinghui Lyu1, Ryuhei Kanda2, Susumu Tsuda3
1Department of Fixed Prosthodontics and Occlusion, Osaka Dental University, 8-1 Kuzuhahanazonocho, Hirakata 573-1121, Osaka, Japan.
International journal of molecular sciences
|November 14, 2023
概括
研究人员开发了一种用于牙科应用的聚乙乙基 (PEEK) 表面的新方法. 这种表面修改增强了PEEK的质量.
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
- 生物材料工程 生物材料工程
背景情况:
- 聚乙基 (PEEK) 显示出牙科应用的潜力,但由于表面能量和湿透性差,需要进行表面处理.
- 目前有效的PEEK表面处理方法仍在争论中.
- 开发可靠的表面修饰技术对于优化PEEK在牙科环境中的性能至关重要.
研究的目的:
- 使用弗里德尔-克拉夫茨化法对聚乙乙基 (PEEK) 表面进行碳氧化.
- 为了研究碳化PEEK表面进一步化学修改的可行性.
- 在经过连续的化学修饰后评估PEEK的表面特性.
主要方法:
- PEEK样品通过Friedel-Crafts化处理,使用酸盐化物和化 (AlBr3).
- 碳氧化PEEK表面经过了与1H,1H-pentadecafluorooctylamine和N,N'-dicyclohexylcarbodiimide的脱水凝结反应.
- 在每个阶段使用光谱 (FTIR) 和元素分析 (XPS) 分析了表面特性.
主要成果:
- 谱分析证实了在PEEK表面上存在碳酸基 (COOH) 和相关的吸收带 (3300-3500 cm-1).
- 二次修改成功地减少了最初的吸收波段,并引入了独特的 (F1s) 信号,表明了成功的功能化.
- 结果表明,在PEEK表面上成功引入并随后修改了碳酸基.
结论:
- 弗里德尔 - 克拉夫茨用酸无水化的乙化是一种有效的方法,用于碳化PEEK表面.
- 引入的炭基可以通过脱水-凝结反应进一步进行化学修饰.
- 这种序列反应策略允许在PEEK表面上量身定制地传递特定的化学结构,以提高性能.
相关概念视频
Electrophilic Aromatic Substitution: Friedel–Crafts Acylation of Benzene
7.1K
The Friedel–Crafts acylation reactions involve the addition of an acyl group to an aromatic ring. These reactions proceed via electrophilic aromatic substitution by employing an acyl chloride and a Lewis acid catalyst such as aluminum chloride to form aryl ketone.
7.1K
Limitations of Friedel–Crafts Reactions
5.4K
Several restrictions limit the use of Friedel–Crafts reactions. First, the halogen in the alkyl halide must be attached to an sp3-hybridized carbon for the Friedel–Crafts reactions to occur. Vinyl or aryl halides do not react since the carbocations formed are unstable under the reaction conditions. Second, Friedel–Crafts alkylation is susceptible to carbocation rearrangement, and the major products obtained have a rearranged carbon skeleton. In contrast, the acylium ion is...
5.4K
Electrophilic Aromatic Substitution: Friedel–Crafts Alkylation of Benzene
6.6K
Friedel–Crafts reactions were developed in 1877 by the French chemist Charles Friedel and the American chemist James Crafts. Friedel–Crafts alkylation refers to the replacement of an aromatic proton with an alkyl group via electrophilic aromatic substitution. A Lewis acid catalyst such as aluminum chloride reacts with an alkyl halide to form a carbocation. The resulting carbocation then reacts with the aromatic ring and undergoes a series of electron rearrangements before giving the...
6.6K
Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Mechanism
7.9K
Carboxylic acids react with alcohols to yield esters via an acid-catalyzed condensation reaction called Fischer esterification. This is a nucleophilic acyl substitution reaction that proceeds via a tetrahedral intermediate, where a water molecule is eliminated as the leaving group.
7.9K
Carboxylic Acids to Acid Chlorides
6.9K
Carboxylic acids react with SOCl2 or PCl5 to form acid chlorides. Amongst the carboxylic acid derivatives, acid chlorides are the most reactive and synthetically important derivatives. They are useful reagents for Friedel–Crafts acylation of some aromatic compounds.
6.9K
Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Overview
18.1K
The Fischer esterification reaction was developed by the German chemist Emil Fischer in 1895. It is a condensation reaction between carboxylic acids and alcohols in an acidic medium to give esters and water.
18.1K


