Modification of a Brazilian smectite clay with different quaternary ammonium salts

Delbem, Maria Flávia; Valera, Ticiane Sanches; Valenzuela‐Díaz, Francisco Rolando; Demarquette, Nicole R.

doi:10.1590/s0100-40422010000200015

Cited by 42 publications

(30 citation statements)

References 27 publications

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“…The temperature and intensity of the first two peaks related to the dehydration process decreased with the increasing amount of the added surfactant. In addition, the organo-montmorillonites are subjected to a thermal effect at the temperature interval 270-450 °C corresponding to the alkylammonium decomposition [44]. As expected, the mass loss in the whole temperature interval 25-1200 °C increased with increasing amount of the alkylammonium cations.…”

Section: Characterization Of Prepared Organo-montmorillonitessupporting

confidence: 58%

Application of Electrochemistry for Studying Sorption Properties of Montmorillonite

Navrátilová¹,

Mars̆álek²

2012

Clay Minerals in Nature - Their Characterization, Modification and Application

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Section: Characterization Of Prepared Organo-montmorillonitessupporting

confidence: 58%

Application of Electrochemistry for Studying Sorption Properties of Montmorillonite

Navrátilová¹,

Mars̆álek²

2012

Clay Minerals in Nature - Their Characterization, Modification and Application

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“…This localization is a function of the nature of the nanoparticles, and thus depends on the size, shape, and chemical surface of the nanoparticles. That is why most often, nanoparticles are organomodified either by chemical grafting [15][16][17] or by ionic exchange [18][19][20][21] in order to be more compatible with blend components. However, while some studies have shown that adding organoparticles could be similar to adding block copolymers, when the latter are located at the interface, no additional relaxation phenomenon has as yet been observed.…”

Section: Introductionmentioning

confidence: 99%

Compatibilization mechanism induced by organoclay in PMMA/PS blends

Genoyer

Yee

Soulestin

et al. 2017

Journal of Rheology

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In this work, the effect of adding organoclay (Cloisite 20A) to a poly(methyl metacrylate) (PMMA)/polystyrene (PS) blend was evaluated in order to understand the compatibilization mechanism taking place. The blend morphology was quantified using micrographs obtained by scanning electron microscopy and observed by transmission electron microscopy. The state of dispersion of the clay was studied using small angle X-ray scattering and wide angle X-ray scattering and by applying the Carreau-Yasuda with a yield stress model to small amplitude oscillatory shear (SAOS) data. Morphological analyses revealed that the clay was intercalated, that its addition resulted in a decrease in the size of the dispersed phase and that it was preferentially located at the interface, except in the case of saturated interfaces, in which case the remaining clay was dispersed in PMMA. By applying the simplified Palierne model to SAOS experiments, the interfacial tension between the polymers forming the blend was inferred and shown to decrease upon addition of clay. The relaxation spectra inferred from the SAOS data, using the Honerkamp and Weese method, revealed four relaxation times: Relaxation of PMMA and PS chains, relaxation of the droplet shape, as well as an additional relaxation phenomenon attributed to the Marangoni stress. Although Marangoni stresses have already been studied in the case of blends compatibilized by block copolymers, this is the first time that it has been evidenced in the case of a clay as compatibilizer. V C 2017 The Society of Rheology. [http://dx

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“…The swelling can help the intercalation and exfoliation process of the clay layers in the polymer matrix, thus forming polymer nanocomposites. It is known that each clay nanostructure presents different properties; generally the intercalation structure may improve the impact property and exfoliation structure may improve the water barrier and gas barrier property and also anti-flammability characteristics 12,11 . Various characterization techniques are used to evaluate the characteristics of these new materials.…”

Section: Introductionmentioning

confidence: 99%