期刊
JOURNAL OF RHEOLOGY
卷 54, 期 2, 页码 421-438出版社
JOURNAL RHEOLOGY AMER INST PHYSICS
DOI: 10.1122/1.3314295
关键词
colloids; phase separation; polymer blends; polymer gels; quenching (thermal); rheology; shear modulus
类别
资金
- NSF [DMR-0602684]
- NASA [NAG3-2284]
- Harvard MRSEC [DMR-0820484]
- EPSRC-GB [GR/S10377/01]
- Swiss National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0820484, GRANTS:13883333] Funding Source: National Science Foundation
- Engineering and Physical Sciences Research Council [EP/E030173/1, GR/S10377/01] Funding Source: researchfish
- EPSRC [EP/E030173/1] Funding Source: UKRI
We investigate the structural, dynamical, and rheological properties of colloid-polymer mixtures in a volume fraction range of phi=0.15-0.35. Our systems are density-matched, residual charges are screened, and the polymer-colloid size ratio is similar to 0.37. For these systems, the transition to kinetically arrested states, including disconnected clusters and gels, coincides with the fluid-fluid phase separation boundary. Structural investigations reveal that the characteristic length, L, of the networks is a strong function of the quench depth: for shallow quenches, L is significantly larger than that obtained for deep quenches. By contrast, L is for a given quench depth almost independent of phi; this indicates that the strand thickness increases with phi. The strand thickness determines the linear rheology: the final relaxation time exhibits a strong dependence on phi, whereas the high frequency modulus does not. We present a simple model based on estimates of the strand breaking time and shear modulus that semiquantitatively describes the observed behavior.
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