Grafting of Organic Brushes on the Surface of Clay Platelets

2012 ◽  
Author(s):  
V Mittal
Keyword(s):  
Clay Platelets

Parametric Studies on the Grafting of Poly(Methyl Methacrylate) onto Organophilic Montmorillonite Using Silylated Clay Platelets

2014 ◽  
Vol 53 (6) ◽  
pp. 957-974 ◽  
Author(s):  
Mahmood Torabi Angaji ◽  
Reza Rafiee ◽  
Mahmood Hemmati ◽  
Mahdi Abdollahi ◽  
Mir Karim Razavi Aghjeh
Keyword(s):  
Methyl Methacrylate ◽  
Poly Methyl Methacrylate ◽  
Parametric Studies ◽  
Organophilic Montmorillonite ◽  
Clay Platelets

Kilo Aspect Ratio Clay Platelets

2010 ◽  
Vol 636 (11) ◽  
pp. 2113-2113 ◽  
Author(s):  
Michael W. Möller ◽  
Thomas Lunkenbein ◽  
Daniel A. Kunz ◽  
Hussein Kalo ◽  
Martin Schieder ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Clay Platelets

A kinetic investigation of surfactant-free emulsion polymerization of styrene using laponite clay platelets as stabilizers

2011 ◽  
Vol 49 (22) ◽  
pp. 4771-4784 ◽  
Author(s):  
Nida Sheibat-Othman ◽  
Ana-Maria Cenacchi-Pereira ◽  
Amilton Martins Dos Santos ◽  
Elodie Bourgeat-Lami
Keyword(s):  
Emulsion Polymerization ◽  
Kinetic Investigation ◽  
Clay Platelets

A Permeability Model for Polymer-Clay Nanocomposites with Varying Clay Platelets Thickness

2018 ◽  
Vol 916 ◽  
pp. 3-9 ◽  
Author(s):  
Abdulhamid Al-Abduljabbar
Keyword(s):  
Polymer Matrix ◽  
Volume Fraction ◽  
Matrix Material ◽  
Single Layer ◽  
High Ratio ◽  
Actual State ◽  
Clay Nanocomposites ◽  
Permeability Model ◽  
Bulk Polymer ◽  
Clay Platelets

Polymer-clay nanocomposites (PCNC), are characterized by the high ratio of surface area to volume of the clay nanoparticles which are in the form of clay platelets with very high aspect ratio. This feature provides superior gas barrier properties at very low volume fraction of the nanofiller. Clay platelets introduce discontinuity to flows through the bulk polymer matrix material. The extent of this improvement depends on the success of separation of clay layers during processing which would produce single-layer particles (exfoliation) or several-layer particles (intercalation) through the bulk polymer matrix. This paper discusses the common permeability models used to capture the effects of the clay nanofillers in PCNC. Since these models assume a state of full exfoliation of clay platelets; that is a single phase of the nanofiller, they fall short of representing the actual state as evidenced by experimental works, which confirm the presence of both the intercalated phase and the exfoliated phase. A model that incorporates clay inclusions with different sizes (different thicknesses) is proposed and its implications are assessed.

Effect of variations in microstructure on clay elastic anisotropy

Geophysics ◽  
2020 ◽  
Vol 85 (2) ◽  
pp. MR73-MR82 ◽  
Author(s):  
Colin M. Sayers ◽  
Lennert D. den Boer
Keyword(s):  
Elastic Properties ◽  
Volume Fraction ◽  
Elastic Anisotropy ◽  
Rock Physics ◽  
Elastic Stiffness ◽  
Single Domain ◽  
Model Parameters ◽  
Stiffness Tensor ◽  
Elastic Stiffness Tensor ◽  
Clay Platelets

Rock physics provides a crucial link between seismic and reservoir properties, but it requires knowledge of the elastic properties of rock components. Whereas the elastic properties of most rock components are known, the anisotropic elastic properties of clay are not. Scanning electron microscopy studies of clay in shales indicate that individual clay platelets vary in orientation but are aligned locally. We present a simple model of the elastic properties of a region (domain) of locally aligned clay platelets that accounts for the volume fraction, aspect ratio, and elastic-stiffness tensor of clay platelets, as well as the effective elastic properties of the interplatelet medium. Variations in clay anisotropy are quantified by examining the effects of varying model parameters upon the effective transverse-isotropic (TI) elastic-stiffness tensor of a domain. Statistics of these distributions and correlations between stiffnesses and anisotropy parameters enable the most probable sets of stiffnesses to be identified for rock physics calculations. The mean of these distributions is on the order of twice the mode for in-plane stiffnesses ([Formula: see text], [Formula: see text], [Formula: see text]), but it is of the same order as the mode for out-of-plane stiffnesses ([Formula: see text], [Formula: see text], [Formula: see text]). Despite random sampling, well-defined relations emerge, consistent with similar shale relations reported in the literature. Expressing these relations in terms of [Formula: see text] for a single domain of aligned clay platelets facilitates their general application. In the limit that the volume fraction approaches unity, the elastic stiffnesses thus derived reproduce those of the clay mineral assumed as platelets. Given the elastic-stiffness tensor of a single domain of aligned clay platelets, the effective TI elastic-stiffness tensor of clay is obtained by integrating over the clay-platelet orientation-distribution function.

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