聚合物链较少但粘附性更高:梯度刚性水凝层如何通过网络拉伸调节粘附性
Md Mahmudul Hasan1, Alison C Dunn1,2
1Department of Mechanical Science and Engineering, University of Illinois Urbana-Champaign, 1206 W Green St., Urbana, Illinois 61801, USA.
The Journal of chemical physics
|November 10, 2023
概括
梯度刚性水凝由于其可适应的聚合物网络而表现出增强的附着性. 聚烯胺水凝中的更厚的梯度层促进了更大的拉伸和粘附,这对于生物材料和环境应用至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 生物物理学的生物物理.
- 聚合物化学 聚合物化学
背景情况:
- 渐变软的外层在生物组织和合成水凝中很常见.
- 这些层影响与对面表面的相互作用和接触力学.
- 在梯度层中聚合物分布可能通过网络适应性增强拉伸和粘附.
研究的目的:
- 在梯度刚度聚烯胺基凝中研究深度依赖粘附.
- 评估不同梯度层厚度对粘附特性的影响.
- 了解聚合物网络重组在粘附现象中的作用.
主要方法:
- 使用原子力显微镜 (AFM) 的纳米痕.
- 使用玻璃和聚氧甲基烯 (POM) 模具制造的具有梯度刚性的聚烯胺基凝.
- 分析了深度依赖的粘附,负载-卸载歇斯底里和分离工作.
主要成果:
- 用POM成型的水凝 (更厚的梯度层) 比玻璃成型的水凝 (更薄的梯度层) 具有更大的粘附性.
- 梯度层内的缩增加了由于稀疏的外部网络中的流体运输而引起的歇斯底里.
- 在浅水深处观察到增强的粘附和分离工作,这归因于外部网络的伸展能力.
结论:
- 梯度刚性水凝具有可调节的粘附特性,受层厚度和聚合物分布的影响.
- 稀疏的外部聚合物网络在通过增强拉伸促进粘附方面发挥着关键作用.
- 这些发现支持在健康和环境科学中应用梯度水凝.
相关概念视频
01:14Adhesion
Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
Capillary action is a result of water’s adhesive tendencies. When a narrow glass...
Capillary action is a result of water’s adhesive tendencies. When a narrow glass...
01:08Molecular 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...
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...