相关实验视频

Updated: Jun 21, 2025

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy

Published on: August 13, 2019

水中的短侧链硫酸的微观结构和风病学特性/2-醇

Yan Qiu¹, Xinyang Zhao¹, Hong Li²

¹Advanced Rheology Institute, Department of Polymer Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

|July 13, 2024

概括

我们研究了短侧链完全硫酸 (S-PFSA) 分散的质性质,在不同的度模式中揭示了不同的缩放行为. 疏水性相互作用影响纠度,影响溶液涂层过程.

科学领域:

聚合物科学聚合物科学
材料科学材料科学材料科学
类风病学类风病学类风病学

背景情况:

多电解质溶液表现出由静电和疏水相互作用影响的复杂的质行为.
短侧链 perfluorosulfonic 酸 (S-PFSA) 是一个有前途的质子交换膜材料,具有性和性成分.
了解S-PFSA分散的体质对于控制它们在溶液涂层等应用中的流动性质至关重要.

研究的目的:

系统地研究水/2-醇混合物中S-PFSA的微观结构和质性质.
阐明多重相互作用 (静电和疏水) 对S-PFSA分散的风学缩放的影响.
为加工过程中的定量控制提供S-PFSA的质性行为提供机械洞察力.

主要方法:

微角X射线散射 (SAXS) 用于描述S-PFSA体粒子形成和相关性长度.
宏观生物学和扩散波谱学 (DWS) 微观生物学探测不同的度模式.
分析线性粘弹性,包括纠度和平原模量和放松时间的缩放关系.

主要成果:

萨克斯证实了半柔性S-PFSA体颗粒的形成,相关性长度缩放为 ξ~c^-0.5.
风病学测量确定了不同的缩放模式:半透明无 (η_sp~c^0.5),半透明纠 (η_sp~c^1.5) 和缩 (η_sp~c^4.1).
发现疏水性相互作用低估了纠度;确定了真正的纠度 (c_te),平原模量和放松时间与缩方案中的中性聚合物溶液相似 (G_e~c^2.4, τ_r/τ_e~c^4.2).

结论:

S-PFSA分散的风学行为是由静电和疏水相互作用的组合所支配的,导致特定的缩放规律.
疏水性相互作用显著影响纠度的确定,需要精细的方法进行准确的评估.
在缩状态下,S-PFSA分散物表现出类似于中性聚合物溶液的特性,为溶液涂层的可预测处理提供了潜力.

关键词:

扩散波谱学是一种波谱学.微观结构就是微观结构.学的缩放缩放.短侧链 perfluorosulfonic 酸的使用情况.粘性弹性粘性弹性

更多相关视频

Preparation of Hollow Polystyrene Particles and Microcapsules by Radical Polymerization of Janus Droplets Consisting of Hydrocarbon and Fluorocarbon Oils

Preparation of Hollow Polystyrene Particles and Microcapsules by Radical Polymerization of Janus Droplets Consisting of Hydrocarbon and Fluorocarbon Oils

Published on: January 25, 2018

Formulation and Acoustic Modulation of Optically Vaporized Perfluorocarbon Nanodroplets

Formulation and Acoustic Modulation of Optically Vaporized Perfluorocarbon Nanodroplets

Published on: July 16, 2021

相关概念视频

Physical Properties of Carboxylic Acids

Physical Properties of Carboxylic Acids

Carboxylic acids with lower molecular weight exhibit a sharp and unpleasant odor. They also have higher boiling and melting points than analogous compounds, such as aldehydes, ketones, and alcohols.

Physical Properties of Carboxylic Acid Derivatives

Physical Properties of Carboxylic Acid Derivatives

Intermolecular forces dictate several physical properties such as boiling points, melting points, solubilities, and so forth. They are classified into four types: ionic forces, hydrogen bonds, dipole–dipole forces, and dispersion forces. Ionic forces are the strongest, while dispersion forces are the weakest.
Among the carboxylic acid derivatives, the boiling points of acid chlorides and esters are very similar and are the lowest in the series. Acid anhydrides have slightly higher boiling...

Solvating Effects

Solvating Effects

An understanding of the solvating effect helps rationalize the relation between solvation and acidity of the compound. In addition, this also explains the relative stability of conjugate bases for compounds with different pKa values. This lesson details, in-depth, the principle of solvating effects. The strength of an acid and the stability of its corresponding conjugate base are determined using pKa values. This observed relationship is a consequence of solvation, which is the interaction...

Colloids

Colloids

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...