利用RAFT乳液聚合物的单体料机制,使得不对称的Divinyl单体的聚合诱导自组合
Jiaxi Zhou1, Qian Huang1, Li Zhang1,2
1Department of Polymeric Materials and Engineering, School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China.
ACS macro letters
|October 16, 2023
概括
研究人员使用可逆添加碎片链转移 (RAFT) 乳液聚合开发了交联块共聚合物纳米颗粒. 这种方法允许控制形态,并为先进的材料功能化和水凝性质调整提供了潜力.
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
- 纳米技术 纳米技术
背景情况:
- 控制的聚合技术对于合成先进的聚合物架构至关重要.
- 聚合诱导的自我组装 (PISA) 提供了一个创建复杂纳米结构的途径.
- 由于它们的反应性,多单体在受控聚合中存在挑战.
研究的目的:
- 使用单体养机制,实现非对称的二维尼尔单体的聚合诱导自我组装 (PISA).
- 为制备具有可调整形态的合体稳定,交联块共聚物纳米颗粒.
- 探索这些纳米粒子在水凝中的功能化潜力和应用.
主要方法:
- 使用可逆添加碎片化链转移 (RAFT) 乳液聚合法,采用单体养策略.
- 通过调整单体度,核心块DP和宏RAFT代理长度来控制纳米粒子形态 (例如囊泡).
- 使用X射线光电子光谱学 (XPS) 描述了纳米粒子组成和功能组.
主要成果:
- 在高固体条件下成功合成了具有多样性形态的交联块共聚合物纳米粒子.
- 通过聚合参数证明了对纳米粒子形态的控制.
- 证实了未发生反应的乙烯基组的存在,用于随后的乙烯功能化.
- 展示了纳米粒子在调水凝机械性能中的应用.
结论:
- 单体养RAFT乳液聚合是有效的PISA的divinyl单体.
- 精确定义的,交叉链接的块共聚合物纳米颗粒可以准备具有可调节的特性.
- 这些纳米粒子为进一步改造和材料增强提供了多功能平台.
相关概念视频
00:57Cationic Chain-Growth Polymerization: Mechanism
2.3K
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...
2.3K
01:09Radical Chain-Growth Polymerization: Mechanism
2.6K
The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
2.6K
01:04Anionic Chain-Growth Polymerization: Mechanism
2.0K
The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
2.0K
02:35Free-Radical Chain Reaction and Polymerization of Alkenes
7.9K
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.
7.9K
01:03Step-Growth Polymerization: Overview
3.5K
Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
Many natural and synthetic polymers are produced by...
3.5K
01:10Radical Chain-Growth Polymerization: Overview
2.4K
Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
2.4K