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聚 N-异丙基丙烯酰胺（PNIPAM）和聚丙烯酸（PAA）软粒子的玻璃化转变和缠结流变学。

Glass and Jamming Rheology in Soft Particles Made of PNIPAM and Polyacrylic Acid.

机构信息

Dipartimento di Scienze di Base e Applicate per l'Ingegneria (SBAI), Sapienza Università di Roma, 00185 Roma, Italy.

Istituto dei Sistemi Complessi del Consiglio Nazionale delle Ricerche (ISC-CNR), Sede Sapienza, 00185 Roma, Italy.

出版信息

Int J Mol Sci. 2021 Apr 14;22(8):4032. doi: 10.3390/ijms22084032.

DOI:10.3390/ijms22084032
PMID:33919803
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8070831/
Abstract

The phase behaviour of soft colloids has attracted great attention due to the large variety of new phenomenologies emerging from their ability to pack at very high volume fractions. Here we report rheological measurements on interpenetrated polymer network microgels composed of poly(-isopropylacrylamide) (PNIPAM) and polyacrylic acid () at fixed content as a function of weight concentration. We found three different rheological regimes characteristic of three different states: a Newtonian shear-thinning fluid, an attractive glass characterized by a yield stress, and a jamming state. We discuss the possible molecular mechanisms driving the formation of these states.

摘要

由于软胶体在极高的体积分数下能够实现紧密堆积，从而表现出多种多样的新颖现象，因此其相行为引起了广泛关注。本文报告了聚（N-异丙基丙烯酰胺）（PNIPAM）和聚丙烯酸（）组成的互穿聚合物网络微凝胶在固定 含量下作为重量浓度函数的流变测量结果。我们发现了三种不同的流变状态，它们分别具有牛顿剪切稀化流体、具有屈服应力的吸引力玻璃和阻塞状态的特征。我们讨论了形成这些状态的可能分子机制。

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