照片交叉连接的Diels-Alder和乙烯聚合物网络
1Dept. of Chemical Engineering, McGill University 3610 Rue Universite Montreal QC H3A 0C5 Canada milan.maric@mcgill.ca.
RSC advances
|January 6, 2025
概括
这项研究开发了新的双交联聚合物网络,使用乙烯基醇二cyclopentenyl乙太甲基酸盐,植物油基基甲基酸盐和furfuryl甲基酸盐. 这些材料具有可调节的特性,并显示可回收的粘合剂应用的希望.
科学领域:
- 聚合物化学 聚合物化学
- 材料科学 材料科学 材料科学
- 有机合成 有机合成
背景情况:
- 开发具有定制机械和热性能的先进聚合物网络对于新材料应用至关重要.
- 双交叉连接策略为结合可逆和永久网络特征提供了一条途径.
- 结合 furan 和 norbornene 的功能,可以实现特定的交联化学反应,如 Diels-Alder 反应.
研究的目的:
- 合成和表征乙烯基醇二cyclopentenyl乙烯基甲基酸盐 (EGDEMA),植物油基基甲基酸盐 (C13MA) 和furfuryl甲基酸盐 (FMA) 的聚合物.
- 使用Diels-Alder (DA) 化学和烯交叉连接,创建单个交叉连接的可逆和双交叉连接网络.
- 评估交叉连接策略对产生的材料机械,热和粘合性能的影响,以便在可回收粘合剂中潜在使用.
主要方法:
- 使用启动器进行连续激活器再生 (ICAR) 原子转移基聚合 (ATRP) 的特聚合.
- 通过Diels-Alder (DA) 反应与1,1' - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 甲基基-4,1-) 双胺 (BM) 和硫乙烯反应进行交叉连接.
- 使用紫外线光和热启动进行照片启动,用于交叉连接.
- 使用里埃变换红外光谱学 (FTIR) 和差分扫描热度计 (DSC) 进行了表征.
- 通过rheological测试对粘合性质的评估.
主要成果:
- 成功合成了带有和诺波功能的受控结合的聚合物.
- 形成单交叉连接的可逆DA网络和双交叉连接的网络,并添加额外的乙烯链接.
- 紫外线固化证明双交联系统的效率更高,导致凝含量增加.
- FTIR和DSC证实了DA adducts的形成和DA反应的可逆性.
- 风病学测试表明适合用于粘合剂应用.
结论:
- 结合可逆DA化学和永久乙烯键的双交联策略,产生具有增强机械强度和热稳定性的材料.
- 开发的聚合物提供了功能多功能性,并且是可回收的粘合剂应用的有希望的候选者.
- 紫外线固化是一种有效的方法,可以在这些双交联系统中实现高交联效率.
更多相关视频
相关概念视频
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction
9.8K
The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
9.8K
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)
1.9K
Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
1.9K
Free-Radical Chain Reaction and Polymerization of Alkenes
7.5K
The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
7.5K
Anionic Chain-Growth Polymerization: Overview
2.0K
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
2.0K
Ziegler–Natta Chain-Growth Polymerization: Overview
3.2K
Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
3.2K
Polymers
33.6K
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
33.6K


