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Cationic Chain-Growth Polymerization: Mechanism

Cationic Chain-Growth Polymerization: Mechanism

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...

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Updated: Jul 2, 2025

Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes

Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes

Published on: December 24, 2014

在聚合物刷中纳米颗粒的插入和二元化.

Jacob T Mims¹, Lavi Tsuna¹, Eric J Spangler¹

¹Department of Physics and Materials Science, The University of Memphis, Memphis, Tennessee 38152, USA.

The Journal of chemical physics

|February 28, 2024

概括

此摘要是机器生成的。

聚合物刷可以控制纳米粒子的插入和组装. 模拟显示纳米粒子透取决于尺寸和聚合物相互作用,使得纳米粒子可控定位和自我组装.

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Formulation of Diblock Polymeric Nanoparticles through Nanoprecipitation Technique

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Published on: September 20, 2011

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Last Updated: Jul 2, 2025

Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes

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Published on: December 24, 2014

Using Polystyrene-block-polyacrylic acid-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization

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Formulation of Diblock Polymeric Nanoparticles through Nanoprecipitation Technique

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科学领域:

材料科学材料科学材料科学
聚合物科学聚合物科学
纳米技术纳米技术

背景情况:

聚合物刷是具有可调节性质的多功能表面涂料.
了解聚合物刷中的纳米粒子相互作用对于先进的材料设计至关重要.

研究的目的:

使用分子动力学模拟系统地研究纳米粒子插入聚合物刷.
探索纳米粒子大小,聚合物相互作用,接种密度和链条长度对插入行为的影响.

主要方法:

用分子动力学模拟来建模纳米粒子聚合物刷系统.
纳米粒子大小,相互作用强度,聚合物接种密度和链条长度的系统变化.

主要成果:

纳米粒子透深度由有利的聚合物-NP相互作用和透压力之间的平衡决定.
增加的相互作用强度增加了NP透率,而更大的NP尺寸或更高的接种密度减少了它.
纳米粒子诱导聚合物链的远程形状变化,导致旋转半径的减弱振荡.
在强的吸引力相互作用下,纳米粒子可以二元化,其方向取决于它们的插入深度.

结论:

聚合物刷可以根据其特性和相互作用有效地定位纳米粒子.
这些发现表明,聚合物刷可以用于受控的纳米粒子自组装.