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Radical Autoxidation01:20

Radical Autoxidation

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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...
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Oxidations of Aldehydes and Ketones to Carboxylic Acids01:15

Oxidations of Aldehydes and Ketones to Carboxylic Acids

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Oxidation of aldehydes and ketones results in the formation of carboxylic acids. Aldehydes, bearing hydrogen next to the carbonyl group, are easily oxidized compared to ketones. This is because an aldehydic proton can easily be abstracted during oxidation.
Aldehydes readily undergo oxidation in strong oxidizing agents such as potassium permanganate and chromic acid. The oxidation can also be carried out using mild oxidizing agents such as silver oxide. In fact, aldehydes can be easily oxidized...
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Accelerated Curing of Concrete01:25

Accelerated Curing of Concrete

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Accelerating concrete curing is achieved by applying heat and additional moisture. This process accelerates the hydration of the cement, resulting in an earlier strength gain in the concrete. Steam curing is a method wherein the concrete products are either transported through a chamber on a conveyor belt or encased in plastic, allowing steam at atmospheric pressure to circulate freely around them. This process begins with a phase of moist curing that typically lasts between 3 to 5 hours, after...
256
Autoxidation of Ethers to Peroxides and Hydroperoxides02:23

Autoxidation of Ethers to Peroxides and Hydroperoxides

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Ethers represent a class of chemical compounds that become more dangerous with prolonged storage because they tend to form explosive peroxides when standing in the air. Autoxidation is the spontaneous oxidation of a compound in air. In the presence of oxygen, ethers slowly oxidize to form hydroperoxides and dialkyl peroxides.
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Curing of Concrete01:20

Curing of Concrete

166
The hydration of cement takes place within the water-filled capillary pores. However, environmental elements can disrupt this process by evaporating water from the concrete surfaces. Sealed concrete with a water-cement ratio below 0.5 experiences self-desiccation, leading to water loss. The water loss in concrete is mitigated by curing. This technique involves keeping the concrete saturated to maintain the necessary temperature and moisture conditions, to optimally fill the spaces in the cement...
166
Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

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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.
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相关实验视频

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Evaluation of the Curing of Adhesive Systems by Rheological and Thermal Testing
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含有6-基醇的粘合剂的自氧化诱导固化

Zhongtian Zhang1, Bruce P Lee1

  • 1Department of Biomedical Engineering, Michigan Technological University, Houghton 49931, USA.

Macromolecular chemistry and physics
|September 2, 2025
PubMed
概括
此摘要是机器生成的。

新开发的6-多巴胺 (6-OHDA) 改性聚乙烯糖醇 (PEG) 生物材料可以通过自氧化快速治愈,从而消除对外部氧化剂的需求. 这种进步为生物医学应用提供了更快,更强的注射粘合剂.

关键词:
6-基甲醇紫外线粘合剂自氧化固化过程

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科学领域:

  • 生物材料科学
  • 聚合物化学
  • 粘合技术

背景情况:

  • 在现场可治愈的生物材料和粘合剂中, catechol 衍生物至关重要.
  • 传统的基于catechol的粘合剂需要外部化学或酶氧化剂来快速固化.

研究的目的:

  • 评估由自氧化驱动的6-多巴胺 (6-OHDA) 修饰的8臂聚乙烯糖醇 (PEG) 的固化可行性.
  • 调查6位基在加速氧化和交联中的作用.
  • 与商业替代品相比,评估开发的生物材料的粘合强度.

主要方法:

  • 用6-OHDA对8臂PEG进行修改.
  • 自氧化疗法动力学的评估.
  • 添加聚乙烯胺 (PEI) 来评估协同效应.
  • 紫外线光谱检测以确定氧化中间体.
  • 对心周组织的粘附测试.

主要成果:

  • 通过自氧化在短短1分钟内固化6OHDA修饰的PEG (8臂PEG-DA-OH).
  • 通过添加PEI,治愈时间缩短到40秒以下.
  • 紫外线光谱证实了无质子化6-OHDA作为主要与原始氨基的交叉连接中间体.
  • 未经修改的catchol-PEG没有自氧化,这凸显了6基的重要性.
  • 与DuraSeal®相比,8臂PEG- DA- OH和PEI混合物显示出较高的粘合强度.

结论:

  • 6-OHDA是一种有效的交叉连接前体,用于开发可通过自氧化而无需外部氧化剂的可注射粘合剂.
  • 电子捐赠基在6-OHDA的6位显著增强氧化和交联率.
  • 这种新生物材料通过水溶提供了更好的附着性和简化激活.