Charge Interaction Effects in Epoxy with Cation Exchanged Montmorillonite Clay and Carbon Nanotubes. Page: 49
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hydrogen bond to a guest polymer. This would act to extend the junction between
particles by polymer-polymer interactions at the surfactant headgroup. Here, the
effective radius of gyration would be determined by the separate but additive
contributions of each polymer type in the linkage. Poor solvents favor closer
polymer associations and unstable particle dispersions due to greater
interparticle collisions.
Other variables can also change the extension of the molecular
headgroup into the surrounding continuous phase. The effect of shear on
junctions between polymer and particles is to create dangling polymer ends
which contribute to viscous drag at low shear rates. This contribution may make
an unequal or anisotropic impact on the radius of gyration, creating an elipse
rather than a sphere of probable conformations. On larger scales, fluid flow is
already well known to alter the shape of a liquid dispersed phase interface from a
sphere into an ellipse under shearing conditions.
3.2 Aggregate Structural Reorganization
The following factors lead to increased MLS exfoliation in epoxy monomer:
1. Acid catalyzed homopolymerization of bis-phenol A diglycidyl ether
(DGEBA)
2. Low viscosity of the polymer used to penetrate the MLS gallery.
3. Optimized length of the organic cation
(a) Provide a pillar tall enough for significant molecular penetration.
(b) Be narrow enough (no bulky side chains) to avoid spatial
hindrance.49
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Butzloff, Peter Robert. Charge Interaction Effects in Epoxy with Cation Exchanged Montmorillonite Clay and Carbon Nanotubes., dissertation, May 2005; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc4786/m1/62/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .