期刊
SOFT MATTER
卷 15, 期 28, 页码 5626-5637出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8sm02336k
关键词
-
类别
资金
- U.S. Department of the Interior, Bureau of Reclamation [R16AC0002]
- U.S. Department of Energy's NNSA [89233218CNA000001]
- National Science Foundation [1438584]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1438584] Funding Source: National Science Foundation
Amphiphilic block copolymers self-assemble at the water/oil interface to form different mesomorphic structures, such as lamellar, micellar cubic, normal hexagonal, and reverse hexagonal structures. Usually, these structures are polycrystalline and the value of their elastic modulus depends on the average orientation of their constituent's single crystals. We provide a model to predict the elastic modulus and yielding of mesophases from their characteristic length and intermicellar interactions. Shear modulus of each structure is calculated as a function of deformation (strain). Zero-shear modulus, G(0), depends on the inverse of the intermicellar distance with a power law model. The power law index for each structure is approximately n + 2 where n is the degree of confinement in the mesophase: 1 for lamellar, 2 for both normal and reverse hexagonal, and 3 for micellar cubic structures. Rheological properties of different mesophases of Pluronic P84 in the presence of water and p-xylene are used as a case study. The model is found to be in good agreement with experimental data in the linear viscoelastic region. When compared to experimental data, the yield strain value obtained from the model is one order of magnitude higher than the limit of the linear viscoelastic regime and close to the strain at the cross-over point of storage and loss moduli. Frequency sweep measurements are done to characterize the relaxation and cooperative model behaviors of each mesophase structure.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据