Octadecylamine-modified

The effect of stereochemistry and polydispersity on nanocomposite properties has yet to be explored fully. An intriguing result was obtained by Quijada et al. who performed melf mixing of PP-g-MA with octadecylamine-modified montmorillonite or hectorite, then blended these materials with different isotactic polypropylenes. Nanocomposites with better clay exfoliation were obtained using metallocene polypropylene compared to Ziegler-Natta polypropylene, presumably because of ifs lower polydispersity. While stereoselective metallocene catalysts have been used successfully for in situ propylene polymerization in combination with clay supports (see Section 5.2.2.2), the materials properties of these nanocomposites have thus far received insufficienf affention. 

Y. Zhang, J.E. Mark, Y. Zhu, R.S. Ruoff, D.W. Schaefer, Mechanical properties of polybutadiene reinforced with octadecylamine modified graphene oxide. Polymer, ISSN 0032-3861 55 (21) (October 9, 2014) 5389-5395. http //dx.doi.0rg/lO.lOl6/j. polymer.2014.08.065. 

A commercially available organoclay based on a layered silicate (montmorillonite modified by dimethyldistearylammonium cation exchange) was used. The content of the quaternary ammonium compound was 38 wt%. Octadecylamine-modified montmorillonite is used to study the thermal stability of organoclay. 

The use of ordered supramolecular assemblies, such as micelles, monolayers, vesicles, inverted micelles, and lyotropic liquid crystalline systems, allows for the controlled nucleation of inorganic materials on molecular templates with well-defined structure and surface chemistry. Poly(propyleneimine) dendrimers modified with long aliphatic chains are a new class of amphiphiles which display a variety of aggregation states due to their conformational flexibility [38]. In the presence of octadecylamine, poly(propyleneimine) dendrimers modified with long alkyl chains self-assemble to form remarkably rigid and well-defined aggregates. When the aggregate dispersion was injected into a supersaturated... 

CA 78, 6096(1973) (Aq expl comprising a higher amine, a gelling agent, and an inorganic oxidizer salt. An example is 60% aq AN 200, modified guar gum 2.8, ethoxylated octadecylamine 2 gm)... 

Definition Reaction prod, of phthalic anhydride and octadecylamine Empirical C26H43NO3 Na Uses Emulsifier in cosmetics rheology modifier, emulsion stabilizer, suspending agent for o/w emulsions, emollients, moisturizing creams/lotions, therapeutic prods. SPF enhancer for sunscreens Trade Name Synonyms STEPAN-MILD RM1 [Stepan http //www.stepan.com]... 

Sodium montmorillonite/PVK composites have been prepared by free radical polymerization using cerium ammonium nitrate [223]. Sodium montmo-rillonite was used in the form of nanolayers both of hydrophilic and organophilic types, modified with octadecylamine and trimethyl stearyl ammonium. 

Mochalin et al modified their procedure for linking octadecylamine to NDs via amide bonds [53] to link ethylenediamine to the surface of purified carboxylated NDs and to produce covalently bonded ND-epoxy composites [54,55]. Alkyl chains or polymers can be grafted onto NDs via the reaction of esterification or silanization [25,56-60]. Zhang et al. employed an approach for grafting polyimides from ND surface via acyl chloride functionalization. This technique provided a superior dispersion... 

Organically modified clays achieved a good dispersion in the NR matrix. Mt modified with octadecylamine ammonium chloride was melt blended with NR, a water suspension of a Cig based organoclay (the other substituents being three methyl groups) was slowly added to a NR latex. OC was also... 

The easy formation of filler networks allows thus the achievement of remarkable reinforcement of the rubber matrix at low clay content. To mention just an example, a comparable mechanical reinforcement of a NR matrix was obtained with 10 phr Mt modified with octadecylamine and 40 phr CB. The low amount of nanofiller allowed almost double elongation at break to be achieved, a lower compression set and similar abrasion loss. Moreover, a much lower heat built up was obtained with respect to 50 phr CB. ... 

Investigations based on carbon paste electrodes (modified with octadecylamine or stearic acid to provide amine or carboxylic acid functionalities) were quickly abandoned owing to problems with day-to-day reproducibility and precision. Regeneration methods used to denature the double-stranded DNA on the nucleic acid functionalised glassy-carbon electrode surfaces were found to destroy the carbon paste electrodes. Regeneration of sensors based on glassy carbon electrodes was reported to be effectively achieved by treatment with hot (100°C) distilled water for 10 minutes and that no significant peak current deterioration was observed to... 

Na-montmorillonite (MMT) was purified by dispersion of crude clay into deionized water and separation of non-colloidal impurities. To obtain cation exchange process, the purified MMT was swollen in deionized water for 24 h agitation at room temperature and a certain quantity of 1-octadecylamine was added. The system was maintained at around 68 °C for about 4 h and then filter and repeatedly washed with deionized water. The product was then dried, crushed, and sieved with 325-mesh to obtain organically modified montorillonite (OMMT). The main objective for the modification of nanoclay montmorillonite consists in or-ganophilization of clay in order to improve the compatibility with epoxy resin blends. Otherwise, the polymer and the clay will form a separate phase system with a low interface among the various components. 

In the nanocomposites field, a doctoral thesis investigated the use of natural graphite (NG) and graphite modified with octadecylamine (ODA-AM-G) as a filler in nanocomposites of rPET and graphite [28]. The graphite underwent an oxidative treatment, and a functionalisation with octadecylamine (Figure 2.13). The nanocomposites containing 0-3 % of NG and ODA-AM-G were prepared by... 

L.G. Carreira in Composites of Polyethylene Terephthalate and Modified Graphite with Octadecylamine Structural, Thermal Mechanical and Morphological Characteristics, Institute de Macromoleculas Professora Eloisa Mano, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil, 2012. [Doctoral Thesis]... 

Graphite modified with octadecylamine Optical microscopy Organically modified montmorillonite Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)... 

E - clay surface modified with 25-30 wt% octadecylamine (Nanoclay, USA),... 

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