高温耐氧化基混合物 通过新型有机-无机共价-离子双连续网络实现
Yisen Huang1, Shengdu Yang1, Xiaofeng Chi1
1State Key Lab of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, 610065, China.
Small (Weinheim an der Bergstrasse, Germany)
|March 7, 2025
概括
研究人员使用功能化酸寡合物和-树脂开发了新的有机-无机耐热混合物. 这种方法创造了一个独特的双连续网络,在极端环境中提供出色的热保护.
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
- 陶制品 陶制品是一种陶制品.
背景情况:
- 有机-无机耐热混合物为极端环境应用提供了卓越的热氧化稳定性.
- 在这些混合体中实现分子级双连续网络是一个重大的设计挑战.
研究的目的:
- 开发一种用于制备双连续热固化混合体的新方法.
- 通过分子设计,设计具有增强热保护能力的材料.
主要方法:
- 使用了3 - 碳氧基酸 (3-CPBA) 功能化酸寡合物 (CPO),命名为3-BAPO.
- 在3-BAPO和-树脂 (BPR) 之间进行量身定制的超分子相互作用,以创建具有不同无机含量 (13.5-25.9 wt%) 的混合前体 (3-BRPO).
- 实现了并发的无机离子交联和有机固,形成了共价离子双连续网络.
主要成果:
- 成功合成了具有受控无机含量的3-BRPO混合前体.
- 形成了一个稳定的共价离子双连续网络,由多种有机-无机化学相互作用驱动.
- 由于连续无机相的 in situ 陶化,证明了优越的高温氧化耐受性.
结论:
- 通过使用有机功能化的离子寡合物,建立了一种创新的战略,用于制造双连续热固化混合物.
- 这种方法避免了分离相核,使先进的混合材料的分子工程成为可能.
- 开发的3BRPO混合动力显示出极端条件下热保护的重大前景.
更多相关视频
相关概念视频
02:18Network Covalent Solids
13.3K
Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
13.3K
01:23Properties of Organometallic Compounds
921
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
921
01:00Characteristics and Nomenclature of Homopolymers
2.9K
Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
2.9K
02:23Structure and Nomenclature of Alcohols and Phenols
16.0K
Overview
Alcohols are one of the most important functional groups in organic chemistry. The name of alcohol comes from the hydrocarbon from which it is derived. Alcohols are organic molecules containing the functional hydroxyl or –OH group directly bonded to carbon. Phenols have an OH group directly attached to a benzene ring. While alcohols are colorless, phenol is a white crystalline compound with a characteristic "hospital smell" odor.
As with other organic compounds,...
Alcohols are one of the most important functional groups in organic chemistry. The name of alcohol comes from the hydrocarbon from which it is derived. Alcohols are organic molecules containing the functional hydroxyl or –OH group directly bonded to carbon. Phenols have an OH group directly attached to a benzene ring. While alcohols are colorless, phenol is a white crystalline compound with a characteristic "hospital smell" odor.
As with other organic compounds,...
16.0K
01:17Oxidation of Phenols to Quinones
2.8K
In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
2.8K
00:57Cationic Chain-Growth Polymerization: Mechanism
2.2K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.2K