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首页> 外文期刊>Journal of Applied Polymer Science >Role of particle morphology in the yielding behavior of dense thermosensitive microgel suspensions
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Role of particle morphology in the yielding behavior of dense thermosensitive microgel suspensions

机译：颗粒形态在致密热敏微凝胶悬浮液的产行为中的作用

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摘要

The yielding behavior of dense thermosensitive microgel suspensions of poly(N-isopropylacrylamide) with two different particle morphologies viz core-shell (CS) morphology and particles with uniform crosslink density were studied. Structural properties were examined using dynamic light scattering and yielding behavior was investigated by nonlinear oscillatory rheology. Suspensions of particles with uniform crosslinking density showed a typical hard sphere like behavior with the loss modulus (G '') exhibiting a single peak due to cage breaking while CS type particles shows a double yielding at different ranges of strain similar to that seen in attractive colloidal glasses. The first yielding process in CS microgels is interpreted as due to the disentanglement of the overlapped polymer chains from the shells of the neighboring microgels and the second yielding process due to the breakage of cages formed by neighboring microgel particles. Current study suggests that the interpenetration of polymer chains at high concentrations sets in an attractive like potential leading to double yielding phenomena in an otherwise purely repulsive system. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 137, 48625.
机译：研究了聚（N-异丙基丙烯酰胺）的致密热敏微凝胶悬浮液与两种不同的颗粒形态核 - 壳（CS）形态和具有均匀交联密度的颗粒的致密热敏微凝胶悬浮液。使用动态光散射检查结构性能，并通过非线性振荡流变研究了产生的行为。具有均匀交联密度的颗粒的悬浮液显示出具有由于笼中的损耗模量（G''）的典型硬球，其损失模量（g''）由于笼中出现，而Cs型颗粒显示出不同的应变范围的双重屈服，类似于吸引力胶体眼镜。 CS微凝胶中的第一种产生方法被解释为由于来自相邻微凝块的壳和由于通过相邻的微凝胶颗粒形成的笼的破裂而与相邻微凝胶的壳和第二屈服过程的分离。目前的研究表明，聚合物链在高浓度下的互通在诸如纯粹的排斥系统中的含有吸引力的潜力，导致双重产生现象。 （c）2019 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2019,137,48625。

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