Counterion Effect on Krafft Temperature and Related Properties of Octadecyltrimethylammonium Bromide

Two organophilic bentonites, based on nitrogen-containing compounds, have been synthesised via ion exchange starting from pristine bentonite with octadecyltrimethylammonium bromide (OTAB) and with synthetic melamine-derived N2,N4-dihexadecyl-1,3,5-triazine-2,4,6-triamine (DEDMEL). The chemical and morphological characterization of the organoclays was based on XRD, TEM, Laser Granulometry, X-Ray Fluorescence and CEC capacity. Copoly(styrene-butadiene-styrene)-nanocomposites (SBS-nanocomposites) were obtained by intercalation of the SBS-copolymer into these new organoclays by melt intercalation method. XRD and TEM analysis of the organoclays and of the micro/nano-composites obtained are presented. The effect of the organoclays on the SBS-nanocomposite's flammability properties was investigated using cone calorimeter. An encouraging decrease of 20% in the peak heat released rate (PHRR) has been obtained confirming the important role of melamine's based skeleton and its derived organoclays to act as effective fire retardants and for the improvement of this important functional property in SBS copolymers.

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Heterogeneous Growth and Self-Repairing Processes of Two-Dimensional Molecular Aggregates of Adsorbed Octadecyltrimethylammonium Bromide at Cleaved Mica/Aqueous Solution Interface as Observed by in Situ Atomic Force Microscopy†

Langmuir ◽

10.1021/la980278t ◽

1999 ◽

Vol 15 (10) ◽

pp. 3689-3692 ◽

Cited By ~ 8

Author(s):

Masatoshi Fujii ◽

Bangyin Li ◽

Kazuhiro Fukada ◽

Tadashi Kato ◽

Tsutomu Seimiya

Keyword(s):

Aqueous Solution ◽

Atomic Force Microscopy ◽

Two Dimensional ◽

Molecular Aggregates ◽

Force Microscopy ◽

Solution Interface ◽

Atomic Force ◽

Octadecyltrimethylammonium Bromide

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Counterion Effect on the Morphological and Mechanical Properties of Polymer−Clay Nanocomposites Prepared in an Aqueous Medium

Chemistry of Materials ◽

10.1021/cm070467+ ◽

2007 ◽

Vol 19 (13) ◽

pp. 3334-3342 ◽

Cited By ~ 23

Author(s):

Fábio do Carmo Bragança ◽

Leonardo Fonseca Valadares ◽

Carlos Alberto de Paula Leite ◽

Fernando Galembeck

Keyword(s):

Mechanical Properties ◽

Aqueous Medium ◽

Clay Nanocomposites ◽

Counterion Effect

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Counterion Effect on the Titration Behavior of Poly(maleic acid)

Bulletin of the Chemical Society of Japan ◽

10.1246/bcsj.46.2711 ◽

1973 ◽

Vol 46 (9) ◽

pp. 2711-2715 ◽

Cited By ~ 11

Author(s):

Nobuhiko Muto ◽

Tsuyoshi Komatsu ◽

Tsurutaro Nakagawa

Keyword(s):

Maleic Acid ◽

Counterion Effect

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Self-assembly of sodium dodecylsulfate and dodecyltrimethylammonium bromide mixed surfactants with dyes in aqueous mixtures

Royal Society Open Science ◽

10.1098/rsos.181979 ◽

2019 ◽

Vol 6 (3) ◽

pp. 181979 ◽

Cited By ~ 20

Author(s):

K. M. Sachin ◽

Sameer A. Karpe ◽

Man Singh ◽

Ajaya Bhattarai

Keyword(s):

Surface Tension ◽

Self Assembly ◽

Sodium Dodecylsulfate ◽

Critical Micellar Concentration ◽

Aqueous System ◽

Mixed Surfactants ◽

Dodecyltrimethylammonium Bromide ◽

Aqueous Mixtures ◽

Krafft Temperature ◽

Vis Spectroscopy

The micellar property of mixed surfactant systems, cationic (dodecyltrimethylammonium bromide, DTAB) and anionic (sodium dodecylsulfate, SDS) surfactants with variable molar ratios in aqueous system has been reported by using surface tension and conductivity measurements at T = 293.15, 298.15 and 303.15 K. DTAB concentrations are varied from 1.0 × 10 −4 to 3 × 10 −4 mol l −1 in 1.0 × 10 −2 mol l −1 SDS solution while the SDS concentration is varied from 1.0 × 10 −3 to 1.5 × 10 −2 mol l −1 in approximately 5.0 × 10 −3 mol l −1 DTAB, so that such concentrations of DTAB-SDS (DTAB-rich) and SDS-DTAB (SDS-rich) solutions were chosen 3 : 1 ratio. The critical micellar concentration, as well as surface and thermodynamic properties for DTAB-rich and SDS-rich solutions, were evaluated by the surface tension ( γ ) and conductivity ( κ ) methods. The pseudo phase separation model was coupled with the dissociated Margules model for synergism. The Krafft temperature behaviour and optical analysis of mixed surfactants are studied using conductivity and UV–Vis spectroscopy, respectively. The dispersibility and stability of DTAB-rich and SDS-rich solutions with and without dyes (2.5 × 10 −5 mol l −1 of methyl orange and methylene blue) are carried out by using UV–Vis spectroscopy and dynamic light scattering.

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