来自乌鲁士醇和性的可持续热固化涂层:氧化基热固化行为,结构相互作用和功能性质
Ye-Rin Shin1, Gyeong-Ig Hwang1, Shinwoo Lee1
1Department of Applied Organic Materials Engineering, Chungnam National University, Daejeon 34134, Republic of Korea.
International journal of biological macromolecules
|August 20, 2025
概括
这项研究表明,将乌鲁希醇与素混合,可以制造出可持续的高性能涂料. 素加速了热固化,提高了材料的性能,提供了一个有前途的生物替代品.
科学领域:
- 聚合物科学
- 材料科学
- 可持续的化学
背景情况:
- 这是一种天然聚合物,具有自我固化和耐水性.
- 宁混合物旨在提高乌鲁的疏水性和机械强度.
- 乌鲁西/红素混合物的热固化机制和动力学尚不清楚.
研究的目的:
- 研究urushiol/lignin混合物的热固化机制和结构性质关系.
- 从生物基材料开发可持续的高性能聚合物涂层.
- 阐明红素在urushiol氧化基聚合中的作用.
主要方法:
- 与性红素 (0-75重量%) 混合,并在140°C时进行热固化.
- 使用非同热差扫描热量计 (DSC) 评估固化动力学.
- 分析了化学结构,热稳定性 (TGA),表面形态 (SEM,AFM) 和机械硬度 (Shore D).
主要成果:
- 在较低的温度下,红素加速固化;过多的红素 (≥50%重量) 阻碍了它.
- 第一个证据表明,urushiol和lignin之间的氧化基聚合,涉及到lignin的基.
- 增强的热稳定性 (最多可在517°C下分解) 和提高的Shore D硬度,含有多达50%的重量级木质素.
- 在较高的负载下,红素聚合会影响表面粗性和机械网络异质性.
结论:
- 乌鲁希/红素混合物显示出热可固化的生物基涂料的潜力.
- 最佳的红素含量 (25-50%) 提高了性能和可持续性.
- 利格宁积极参与urushiol的氧化基聚合,改善材料特性.
相关概念视频
01:20Radical Autoxidation
2.2K
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...
2.2K
01:21Radical Oxidation of Allylic and Benzylic Alcohols
2.1K
Activated manganese(IV) oxide can selectively oxidize allylic and benzylic alcohols via a radical intermediate mechanism. Primary allylic alcohols are oxidized to aldehydes, while secondary allylic alcohols yield ketones. The redox reaction of potassium permanganate with an Mn(II) salt such as manganese sulfate (under either alkaline or acidic conditions), followed by thorough drying, yields the oxidizing agent: activated MnO2. While MnO2 is insoluble in the solvents used for the reaction, the...
2.1K
01:10Radical Reactivity: Steric Effects
2.0K
The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
Along with electronic...
Along with electronic...
2.0K
01:16Radical Reactivity: Nucleophilic Radicals
2.2K
Radicals adjacent to electron-donating groups are called nucleophilic radicals. These radicals readily react with electrophilic alkenes. The SOMO–LUMO interactions are the driving force for the reaction, where the high-energy SOMO of the electron-rich, nucleophilic radicals interacts with the low-energy LUMO of the electron-deficient, electrophilic alkenes. Such SOMO–LUMO interactions are the basis of reactive radical traps, affecting the selectivity in radical reactions. For...
2.2K
02:21Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate
13.0K
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.
13.0K
02:44Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
10.8K
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.
10.8K