Citation
García del Cid, M.A. and Gonzalez Prolongo, Margarita and Salom Coll, Catalina and Sanchez-Cabezudo Tirado, Marta and Masegosa Fanego, Rosa María
(2014).
Influence of different organoclays on the curing, morphology, and dynamic mechanical properties of an epoxy adhesive.
"Journal of Adhesion", v. 90
(n. 10);
pp. 817-834.
ISSN 0021-8464.
https://doi.org/10.1080/00218464.2014.903656.
Abstract
The thermal, mechanical, and adhesive properties of nanoclay-modified adhesives were investigated. Two organically modified montmorillonites: Cloisite 93A (C93A) and Nanomer I.30E (I.30E) were used as reinforcement of an epoxy adhesive. C93A and I.30E are modified with tertiary and primary alkyl ammonium cations, respectively. The aim was to study the influence of the organoclays on the curing, and on the mechanical and adhesive properties of the nanocomposites. A specific goal was to compare their behavior with that of Cloisite30B/epoxy and Cloisite15A/
epoxy nanocomposites that we have previously studied. Both
C30B and C15A are modified with quaternary alkyl ammonium
cations. Differential scanning calorimetry results showed that the clays accelerate the curing reaction, an effect that is related to the chemical structure of the ammonium cations. The three Cloisite/nanocomposites showed intercalated clay structures,the interlayer distance was independent of the clay content. The I.30E/epoxy nanocomposites presented exfoliated structure due to
the catalytic effect of the organic modifier. Clay-epoxy nanocompo-sites showed lower glass transition temperature (Tg) and higher values of storage modulus than neat epoxy thermoset, with no significant differences between exfoliated or intercalated nanocom-posites. The shear strength of aluminum joints using clay/epoxy adhesives was lower than with the neat epoxy adhesive. The wáter aging was less damaging for joints with I.30E/epoxy adhesive.