相关实验视频

Updated: Jun 10, 2025

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Published on: September 26, 2016

微弱星聚合物的分离动力学:一个散射粒子动力学研究

Dorothy Gogoi¹, Sanjay Puri¹, Avinash Chauhan²

¹School of Physical Sciences, <a href="https://ror.org/0567v8t28">Jawaharlal Nehru University</a>, New Delhi 110067, India.

Physical review. E

|October 19, 2024

概括

米克托臂星聚合物 (MSP) 混合物显示出取决于臂数和组成的域生长动力学. 对称的MSP融化表现出动态扩展,而非对称的MSP融化表现出由于结构约束而增长较慢.

科学领域:

聚合物物理聚合物物理
材料科学是一种材料科学.
计算化学是一种计算化学.

背景情况:

阶段分离对于聚合物混合物形态学至关重要.
微臂星聚合物 (MSP) 提供可调整的架构,用于控制材料特性.
了解MSP相隔动力学是设计先进材料的关键.

研究的目的:

研究对称和不对称的miktoarm星聚合物 (SMSP/AMSP) 和混合物的相分离动力学.
分析手臂数量和组成对域增长和形态演变的影响.
将MSP混合物的动态行为与线性聚合物混合物的动态行为进行比较.

主要方法:

我们使用了分散粒子动力学 (DPD) 模拟.
模拟集中在MSP融化和与不同架构混合的模拟.
分析包括域增长指数,缩放规律和形态演化.

主要成果:

随着手臂数量的增加,SMSP融化显示了扩散域增长 (指数~1/3) 随后是和,随着时间尺度的功率定律衰变 (指数~1),随着手臂数量的增加.
AMSP化物表现出降低的域增长率与增加的臂数,表明增强的非关键性.
在AMSP中和长度随着非临界度的下降而增加 (指数~2/3).
在MSP混合物中,从粘性 (指数~1) 转变为惯性 (指数~2/3) 水力动态生长模式.

结论:

MSP架构显著影响相位分离动力学和形态学.
化的SMSP表现出动态扩展,而AMSP化的则受结构因素的约束.
MSP混合物与线性聚合物具有相同的动态普遍性,但在早期阶段会出现偏差.

更多相关视频

Particles without a Box: Brush-first Synthesis of Photodegradable PEG Star Polymers under Ambient Conditions

Particles without a Box: Brush-first Synthesis of Photodegradable PEG Star Polymers under Ambient Conditions

Published on: October 10, 2013

Controlled Synthesis and Fluorescence Tracking of Highly Uniform PolyN-isopropylacrylamide Microgels

Controlled Synthesis and Fluorescence Tracking of Highly Uniform PolyN-isopropylacrylamide Microgels

Published on: September 8, 2016

相关概念视频

Molecular Weight of Step-Growth Polymers

Molecular Weight of Step-Growth Polymers

Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...

Polymers: Molecular Weight Distribution

Polymers: Molecular Weight Distribution

For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.

Polymer Classification: Stereospecificity

Polymer Classification: Stereospecificity

Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...