Authors:M. N. Radhakrishnan Nair and M. R. Gopinathan Nair
the simplicity of this mass loss method.
The reaction between diisocyanates and a mixture of diols of different molecular masses provides thermoplastic polyurethane elastomers with a block segment structure. The preparation of thermoplastic
Authors:Mirela Barbu, Mircea Stefanescu, Marcela Stoia, Gabriela Vlase, and Paul Barvinschi
Our previous studies on nanocrystalline metal chromites synthesis, starting from a mixture of Cr(III) nitrate-M(II) nitrate with diol has evidenced that at 70 °C a redox reaction takes place between Cr(NO 3 ) 3 ·9H 2 O and diol, and at ~130
[ 11 – 13 ].
Due to the fact that the derivatives of aromatic diols and epoxides have been used in several applications and have a good physico-chemical properties, we used them for the synthesis of porous microspheres [ 14 – 18
-molecular-mass glycol or diol which serve as glycolysis agents. Usually, the catalysts are used, and in some cases, amines are added which results in aminoglycolysis. The products of glycolysis are the so-called glycolysates, which consist of a homogenous mix of various
Authors:Nouga C. Batista, José L. Silva Sá, Bruce R. McGarvey, Douglas W. Franco, and Benedito S. Lima-Neto
spectroscopy. Studies on cis -[Ru(NH 3 ) 4 (H 2 O) 2 ](tfms) 3 and [Ru(NH 3 ) 5 H 2 O](tfms) 3 as probe complexes with the monomer and different organic compounds representing the organic functions in the monomer (furan, norbornene, but-2-ene-1,4-diol and
Dynamic mechanical and thermal properties of poly(ester urethanes) (PEU) cross-linked with styrene have been studied. The
investigated polyurethanes were obtained from 4,4′-diphenylmethane diisocyanate and unsaturated oligo(alkyleneester)diol based
on cis-2-butene-1,4-diol. The conducted analyses dealt with the correlation between the chemical structure of poly(ester urethanes)
and their ability to phase separate as well as their thermal stability. The products of PEU thermal degradation were characterized
using infrared spectroscopy.
Authors:Giuseppina Castronuovo, V. Elia, and Filomena Velleca
Enthalpies of dilution of ternary aqueous solutions containing glucose and alkan-1-ols, alkan-1,2-diols and alkan-m,n-diols were determined at 298.15 K by flow microcalorimetry. The pair-wise cross interaction coefficients of the virial expansion of the excess enthalpies were evaluated: they are positive and depend in a complex manner on the length of the alkyl chain of the alkanols. The behaviour of these systems is interpreted in terms of preferential interactions between the hydrophilic groups of the alkanols and the destructured domain present on glucose.
Authors:Tatiana Bernardi, Elena Tamburini, and Giuseppe Vaccari
A first attempt at the separation of fructo-oligosaccharides (FOS) and inulin mixtures is presented. Preliminary results obtained by automated multiple development (AMD) of diol layers with an acetonitrile-acetone-water polarity gradient are reported. The method is very promising and highly suitable for simple, direct analysis of complex mixtures of fructo-oligosaccharides (FOS) and inulin in samples of natural origin.
Authors:J. Haponiuk, M. Strankowski, and T. Łazarewicz
The melting and crystallization of a series of polyurethanes derived from poly(1,6-hexylene adipate)diol (PHA), 4,4'-dicyclohexylomethane
diisocyanate (HMDI) and 4,4'-bis(10-hydroxydecaoxy)biphenyl (BHDBP) as a chain extender were investigated by using DSC. Thermal
properties of the polyurethanes were found to be strongly influenced by the hard segment content.