概括
对cis-polybutadiene膜的单片分子氧处理产生了表面氧化物. 然后使用内部反射红外光谱检测到这些氧化物.
科学领域:
- 聚合物化学 聚合物化学
- 表面科学是一门学科.
- 氧化化学 有氧化化学
背景情况:
- 单片分子氧是一种高度反应的物种.
- 聚丁是一种合成,在各种工业中具有潜在的应用.
- 聚合物的表面修饰对于增强材料性能至关重要.
研究的目的:
- 为了研究单分子氧与cis-polybutadiene的表面反应.
- 为了识别聚合物表面形成的化学物种.
- 展示一种检测这些表面物种的方法.
主要方法:
- 通过微波释放氧气产生单分子氧气 ((1)Delta(g)).
- 将cis-polybutadiene薄膜暴露在单点氧流系统中.
- 用内部反射红外光谱学分析聚合物表面.
主要成果:
- 用单分子氧处理cis-polybutadiene导致形成氧化物.
- 氧化水形成局部在聚合物表面.
- 内部反射红外光谱学成功检测出这些表面氧化物存在.
结论:
- 单片分子氧有效氧化 cis-polybutadiene 的表面.
- 氧化物是这些条件下形成的主要氧化产物.
- 内部反射红外光谱是监测聚合物的表面氧化的一种合适的技术.
相关概念视频
01:20Radical Autoxidation
The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
01:46Oxidative Cleavage of Alkenes: Ozonolysis
In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
02:44Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
02:37Oxidation of Alcohols
In this lesson, the oxidation of alcohols is discussed in depth. The various reagents used for oxidation of primary and secondary alcohols are detailed, and their mechanism of action is provided.
The process of oxidation in a chemical reaction is observed in any of the three forms:
The process of oxidation in a chemical reaction is observed in any of the three forms:
02:21Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate
Alkenes can be dihydroxylated using potassium permanganate. The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
02:04Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids
Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.