The locally columnar model for clay/polymer systems: Connections to scattering experiments

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:544

Article

Frielinghaus, Henrich¹  Koch, Kerstin¹  Antonio, Viviane Pecanha¹  Noda, Yohei²  Koizumi, Satoshi² 

[1] Forschungszentrum Julich, Julich Ctr Neutron Sci MLZ, Lichtenbergstr 1, D-85747 Garching, Germany

[2] Ibaraki Univ, Inst Quantum Beam Sci, 162-1 Shirakata, Ibaraki 3191106, Japan

关键词: Clay;    Polymer;    Nanocomposite;    Scattering model;    Thermodynamic model;   

DOI  :  10.1016/j.jcis.2019.02.091

来源: Elsevier

【 摘 要 】

A tight connection of scattering to thermodynamic models is missing for clay systems. A new approach called locally columnar model gives an attempt for making this connection. The scattering model assumes an up-lining of clay particles with strong paracrystalline order and refers to a chemical potential/distance dependence. The thermodynamic model assumes a bidisperse distance distribution and gives input to the scattering model. Experimentally, polymer/clay systems with many molecular polymer masses were studied showing all very similar scattering curves. While the dominating bulk phase shows only the same weak tendency to stack formation for all molecular polymer masses, one coexisting phase with stronger stack formation was identified. The latter sample was used to determine the thickness of the clay platelets with adsorbed polymer that was then used to model the dominating bulk phase. The comparisons to the theory revealed that (a) most polymers are tightly bound to the clay, and (b) an agreement between the modeling and the theory was achieved. The main result of the experiments is the fraction of free polymers of 1:2400 that are not tightly bound to the clay particles. (C) 2019 The Authors. Published by Elsevier Inc.

【 授权许可】

Free