The interlayer swelling and molecular packing in organoclays

Paul, Donald R; Zeng, Qinghua; Yu, Aibing; Lu, Gao Qing

doi:10.1016/j.jcis.2005.06.024

Cited by 89 publications

(58 citation statements)

References 31 publications

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“…An unique 180 and well-ordered sequence of the 00l reflections is only observed for the C 14 -Mica-3-10, and that 181 corresponds to a basal spacing of 4.02 nm, an interlayer gallery height of 3.08 nm (Table 2), 182 compatible with paraffinic bilayer -type structures. 51,52,53 Paul et al 54 observed that the surfactant 183 molecules adopt an arrangement that allow them to pack efficiently; therefore, the maximum 184 concentration of adsorbed tetradecylammonium in C 14 -Mica-3-10 could favor a high and ordered 185 packing which is reflected in a well-ordered sequence of the 00l reflections. However, in the 186 other C 14 -Mica-n-m, at least two 00l reflections sequences are observed.…”

Section: Na Mas 166mentioning

confidence: 99%

Self-Assembling of Tetradecylammonium Chain on Swelling High Charge Micas (Na-Mica-3 and Na-Mica-2): Effect of Alkylammonium Concentration and Mica Layer Charge

et al. 2015

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A family of tetradecylammonium micas is synthesized using synthetic swelling micas with high layer charge (Na n Si 8−n Al n Mg 6 F 4 O 20 •XH 2 O, where n = 2 and 3) exchanged with tetradecylammonium cations. The molecular arrangement of the surfactant is elucidated on the basis of XRD patterns and DTA.The ordering conformation of the surfactant molecules into the interlayer space of micas is investigated by IR/FT, 13 C, 27 Al, and 29 Si MAS NMR. The structural arrangement of the tetradecylammonium cation in the interlayer space of highcharge micas is more sensitive to the effect of the mica layer charge at high concentration. The surfactant arrangement is found to follow the bilayer-paraffin model for all values of layer charge and surfactant concentration. However, at initial concentration below the mica CEC, a lateral monolayer is also observed. The amount of ordered conformation all-trans is directly proportional to the layer charge and surfactant concentration.

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Section: Na Mas 166mentioning

confidence: 99%

Self-Assembling of Tetradecylammonium Chain on Swelling High Charge Micas (Na-Mica-3 and Na-Mica-2): Effect of Alkylammonium Concentration and Mica Layer Charge

et al. 2015

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“…It has been recognized that the intercalation of an organic surfactant between the clay layers is required in order to change the interlayer structure and to increase the distance between the layers [10]. In this way, the organoclays favor the nanoparticle-polymer interaction necessary to produce nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Characterization of cetylpyridinium bromide-modified montmorillonite incorporated cellulose acetate nanocomposite films

et al. 2015

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An organoclay (MMT-CPB) based on montmorillonite (MMT) and cetylpyridinium bromide (CPB) was synthesized by a cationic interchange process. The presence of CPB into the clay structure was evidenced by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and thermogravimetric analysis (TGA). This organoclay was then used to prepare cellulose acetate (CA) nanocomposite films with different content of this nanofiller (2.5-7.5 wt%) through a casting technique. All nanocomposites were characterized by XRD, FTIR, differential scanning calorimetry, TGA, optical and mechanical analyses. So, nanocomposites were characterized by the intercalation of CA into the clay structure. Organoclay content did not affect the glass transition (T g ) and melting temperature (T m ) of CA; however, thermal stability of CA was slightly improved with the presence of the organoclay. Therefore, optical and mechanical properties were significantly affected with the increase of the organoclay content into the CA. On the other hand, electrical conductivity (EC) measurement was performed to evaluate the release of cetylpyridinium from the CA nanocomposites to an aqueous medium. An important increase of the EC over time was observed. Therefore, the EC values were dependent on the content of MMT-CPB in the CA nanocomposites. However, a likely degradation of cellulose acetate in the aqueous medium affected the surfactant quantification.

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“…These composites are developed through either in situ polymerization, direct solution intercalation of the organically modified layered silicate or melting intercalation into the polymer matrix. A review of literature on organomodified filler-polymer composites show that montmorillonite (bentonite) has been studied extensively [5,6,7,8,9,10,11,12,13]. But as the natural deposits of montmorillonite minerals are rather limited and the demand for bentonites ever increasing, there has been considerable interest in finding substitute mineral.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Properties of Organokaolin Natural Rubber Latex Base Vulcanisate

Ogbebor¹,

Okieimen²,

Ogbeifun³

et al. 2015

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Natural rubber (NR) latex-organokaolin compounds have been investigated. The intercalated kaolin (100% CEC-CTAB of clay) was used in aqueous rubber latex dispersion, from which a coagulum was obtained. The coagulum was used in natural rubber compounds and evaluated for its cure: scorch; t s 1, optimum cure; t 90 min, minimum (ML) and maximum (MH) torque and mechano-physical properties viz: M100, M300, EB (%), hardness and abrasion in mg/1000 rev. The scorch and optimum cure indicated a progressive drop with addition of organokaolin in natural rubber latex based compounds. Vulcanisate mechanical properties generally showed increase as organokaolin loading increased. A correlation between the measure of extent of vulcanization (MH-ML) and properties such as tensile strength, elongation at break, abrasion and hardness showed that the extent of crosslinking as a result of rubber-filler interaction of the natural rubber based compounds increased as organokaolin loading increased.

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The interlayer swelling and molecular packing in organoclays

Cited by 89 publications

References 31 publications

Self-Assembling of Tetradecylammonium Chain on Swelling High Charge Micas (Na-Mica-3 and Na-Mica-2): Effect of Alkylammonium Concentration and Mica Layer Charge

Self-Assembling of Tetradecylammonium Chain on Swelling High Charge Micas (Na-Mica-3 and Na-Mica-2): Effect of Alkylammonium Concentration and Mica Layer Charge

Characterization of cetylpyridinium bromide-modified montmorillonite incorporated cellulose acetate nanocomposite films

Preparation and Properties of Organokaolin Natural Rubber Latex Base Vulcanisate

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