Study of the mesomorphic behaviour of ternary mixtures of alkoxybenzalazines by means of the Scheffé design

Marcos, Mercedes; Meléndez, Enrique; Serrano, J. L.; Mathieu, Didier; Luu, R. Phan Tan; Elguero, José

doi:10.1002/bscb.19830920502

Cited by 7 publications

(2 citation statements)

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“…In the present paper, a classical Scheffé Simplex design, 16 which is well suited for different types of mixtures, 17 has been used. To determine the coefficients of a particular model, Scheffé proposed the study of mixtures whose compositions are distributed symmetrically in a ''simplex'' lattice over the experimental range.…”

Section: Discussionmentioning

confidence: 99%

Effect of Sulfonation on Thermal, Mechanical, and Electrical Properties of Blends Based on Polysulfones

Linares

Benavente

2009

Polym. J.

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Different blends based on polysulfone (PSU), polyethersulfone (PES) and polyimide (PI) were prepared and characterized by Fourier transform IR spectroscopy, differential scanning calorimetry, dynamic-mechanical analysis, and microhardness. Subsequently, polysulfone and polyethersulfone homopolymers were sulfonated by treatment with chlorosulfonic acid. Then, analogous blends to the non-sulfonated ones were obtained and studied through the analysis of their glass transition temperature, microhardness, and electrical behaviour. In addition, a statistical method, suitable for the design of systems with optimized behaviour, has been applied to study these polymer blends and to predict the compositions with the best properties. Research on the area of polymer electrolyte membrane fuel cells has increased markedly over the last few years.

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Section: Discussionmentioning

confidence: 99%

Effect of Sulfonation on Thermal, Mechanical, and Electrical Properties of Blends Based on Polysulfones

Linares

Benavente

2009

Polym. J.

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“…compounds presenting the >CN–NC< motive . After, we reported the mesogenic properties of some mixtures of azines . Recently, we have devoted some papers to study theoretically their properties, particularly the mechanism of isomerization about the CN bonds .…”

Section: Introductionmentioning

confidence: 99%

The structures of two aldazines: [1,1′‐(1E,1′E)‐hydrazine‐1,2‐diylidenebis(methan‐1‐yl‐1‐ylidene)dinaphthalen‐2‐ol] (Lumogen) and 2,2′‐(1E,1′E)‐hydrazine‐1,2‐diylidenebis(methan‐1‐yl‐1‐ylidene)diphenol (salicylaldazine) in the solid state and in solution

Silva

Claramunt

et al. 2013

Magnetic Reson in Chemistry

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A combination of NMR spectroscopy and theoretical methods Density functional theory including dispersion corrections (DFT‐D) was used to study the structures of Lumogen and salicylaldazine. In the solid state, Lumogen exists as the dihydroxy tautomer 1a (an azine, CN–NC) as was already known from an X‐ray determination. In a deuterated dimethyl sulfoxide solution, another tautomer is observed besides 1a; its structure corresponds to the hydroxy‐oxo tautomer 1b (a hydrazone, CN–NH–Csp2). In what concerns salicylaldazine, we have observed only the dihydroxy tautomer 2a. Copyright © 2013 John Wiley & Sons, Ltd.

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Chiral S_C Liquid Crystal Obtained by mixtures and study of the smectic mixtures using the Scheffé algorithm

Marcos

Meléndez

Serrano

et al. 1983

Bulletin des Soc Chimique

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4,4'-didecyloxy-2,2'-dihydroxybenzalazine, S-4'-decyloxv-2-hydroxy-4-(2-methy butoxy)-a,a'-dimethylbenzalazine, 4,4'-didodecyloxy-2,2'-dihydroxy-a,a'-dimethylbenzalazine and 2-hydroxy-4,4'-dinonyloxy-~,a'-dimethylbenzalazine were studied.These systems of mixture were studied using the Scheffi! algorithm which had proved to be particularly useful in the study of these types of mixture. Induction of chirality in a Sc phase by mixture with compounds optically active was studied. Numerous transition solid-solid in mixtures during the melting were obta ned and their repetition was verified.Binary, ternary and quaternary mixtures of four smectogenic compounds : INTRODUCTIONThe study of multicomponent mixtures of liquid crystals is generally complex and laborious. In recent papers (1,2,3) we showed that the application of a mathematical method based on the Scheff6 algorithm is particularly useful in the study of mixtures of three or more components.This method makes use of a small group of previously selected experiments and the equations obtained are adjusted to the real experimental points.The evaluation of the obtained results is carried out by means of test

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Study of the mesomorphic behaviour of ternary mixtures of alkoxybenzalazines by means of the Scheffé design

Cited by 7 publications

References 4 publications

Effect of Sulfonation on Thermal, Mechanical, and Electrical Properties of Blends Based on Polysulfones

Effect of Sulfonation on Thermal, Mechanical, and Electrical Properties of Blends Based on Polysulfones

The structures of two aldazines: [1,1′‐(1E,1′E)‐hydrazine‐1,2‐diylidenebis(methan‐1‐yl‐1‐ylidene)dinaphthalen‐2‐ol] (Lumogen) and 2,2′‐(1E,1′E)‐hydrazine‐1,2‐diylidenebis(methan‐1‐yl‐1‐ylidene)diphenol (salicylaldazine) in the solid state and in solution

Chiral S_C Liquid Crystal Obtained by mixtures and study of the smectic mixtures using the Scheffé algorithm

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Study of the mesomorphic behaviour of ternary mixtures of alkoxybenzalazines by means of the Scheffé design

Cited by 7 publications

References 4 publications

Effect of Sulfonation on Thermal, Mechanical, and Electrical Properties of Blends Based on Polysulfones

Effect of Sulfonation on Thermal, Mechanical, and Electrical Properties of Blends Based on Polysulfones

The structures of two aldazines: [1,1′‐(1E,1′E)‐hydrazine‐1,2‐diylidenebis(methan‐1‐yl‐1‐ylidene)dinaphthalen‐2‐ol] (Lumogen) and 2,2′‐(1E,1′E)‐hydrazine‐1,2‐diylidenebis(methan‐1‐yl‐1‐ylidene)diphenol (salicylaldazine) in the solid state and in solution

Chiral SC Liquid Crystal Obtained by mixtures and study of the smectic mixtures using the Scheffé algorithm

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Chiral S_C Liquid Crystal Obtained by mixtures and study of the smectic mixtures using the Scheffé algorithm