论文标题
由PNIPAM和聚丙烯酸制成的软颗粒中的玻璃和流变学
Glass and Jamming Rheology in Soft Particles Made of PNIPAM and Polyacrylic Acid
论文作者
论文摘要
软胶体的相位行为引起了人们的极大关注，这是由于它们以很高的体积分数包装的能力出现了各种各样的新现象。在这里，我们报告了由固定PAAC含量的聚（Nisropypylasrylamide）（PNIPAM）（PNIPAM）（PNIPAM）和聚丙烯酸（PAAC）组成的互穿聚合物网络微凝胶的流变学测量结果。我们发现了三种不同状态的三种不同的流变状态特征：牛顿剪切的液体，一种以屈服应力为特征的有吸引力的玻璃和一种干扰状态。我们讨论推动这些状态形成的可能分子机制。
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(Nisopropylacrylamide) (PNIPAM) and polyacrylic acid (PAAc) at fixed PAAc 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.
