Charge Interaction Effects in Epoxy with Cation Exchanged Montmorillonite Clay and Carbon Nanotubes. Page: 55
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remained as singlet peak. This impressive result was attributed to a qualitative
difference in dielectric response to two different environments of interfacial
polarization. The two more labile cationic forms allowed sufficient segmental
mobility to cause intercalated DGEBA to accept two ranges of mobility at the
MLS surface. Presumably this was due to the exchanged amine cation, since it
was the only variable. Both conformations for each mobile amine appeared to
afford a different amount of free volume. The DGEBA was able to move in two
distinct environments in response to dielectric polarization, causing the doublet in
the AC loss signal. Complementary results were provided by DC mobility results
for each quaternary amine system that supported this scenario. The authors
indicate this was intriguing and imply that the origin of the doublets could be due
to the existence of small-scale heterogeneity between platelets. No specific
microstructural hypothesis for MLS platelet association was offered on the basis
of this evidence, however the results of Kanapitsas et al. rank among the most
significant recent observations regarding mesoscopic changes when it
considered in the context of Park et al.
Cooperative configurations may signal changes in surface hydrophobicity
in the 'pinched' spaces compared with expanded spaces of dispersed MLS
tactoids. An emulsion was demonstrated by Lee et al. [70] to take advantage of
both hydrophilic and hydrophobic properties of natural clay by forming micelles in
epoxy and water. The main point of this emulsion work was to demonstrate that
alkonium ion substitution was not required to alter general clay morphology.
Polar parts of the epoxy molecule can initiate cooperative change between55
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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/m1/68/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .