Differential scanning calorimetry and elasticity of textured, heat set and mechanical strained polylactide multifilaments

Industrially textured PLA multifilaments were heat set under different conditions at 110 ºC for 1 min and subjected to one cycle of deformation up to 20%. Thermal transitions of the original textured, heat set and cyclic strained filaments were measured using differential scanning calorimetry from 25 to 250 ºC. Cyclic deformation induces an endo-exo transition at peak temperatures between 55 - 60 ºC that is not observed in the original textured and heat set multifilaments. There is another endo-exo transition with peak temperatures between 67 and 72 ºC in all filaments, the intensity of which varies according to texturing conditions, heat setting and cycle strain. Texturing conditions, heat setting and cyclic strain play a role in thermal transitions, the strain at breaking and elastic properties of the filaments. The crystallinity and magnitude of the endo-exo thermal events detected by DSC are related to the strain at breaking and elasticity of polylactide textured multifilamentsPostprint (published version

Hygrometer based on a collagen material

Sensor higrométrico basado en un material colagénico. La presente invención se refiere a un sensor higrométrico que comprende: a) entre un 35% y un 60% en peso respecto al peso total del sensor de un material colagénico seleccionado de lámina de colágeno y piel; b) entre un 2% y un 20% en peso respecto al peso total del sensor de al menos un tensioactivo iónico; c) entre un 30% y un 60% en peso respecto al peso total del sensor de al menos un tensioactivo no iónico; con la condición de que los porcentajes de los distintos componentes del sensor son tales que el total no supera el 100%.Peer reviewedConsejo Superior de Investigaciones Científicas (España)A1 Solicitud de patente con informe sobre el estado de la técnic

Sensor higrométrico basado en un material colagénico

Sensor higrométrico basado en un material colagénico. La presente invención se refiere a un sensor higrométrico que comprende: a) entre un 35% y un 60% en peso respecto al peso total del sensor de un material colagénico seleccionado de lámina de colágeno y piel; b) entre un 2% y un 20% en peso respecto al peso total del sensor de al menos un tensioactivo iónico; c) entre un 30% y un 60% en peso respecto al peso total del sensor de al menos un tensioactivo no iónico; con la condición de que los porcentajes de los distintos componentes del sensor son tales que el total no supera el 100%.Peer reviewedConsejo Superior de Investigaciones Científicas (España)B1 Patente sin examen previ

Sensor higrométrico basado en un material colagénico

[EN] The invention relates to a hygrometer comprising, in relation to the total weight of the sensor: a) between 35 and 60 wt.-% collagen material selected from a lamina of collagen and skin; b) between 2 and 20 wt.-% at least one ionic surfactant; c) between 30 and 60 wt.-% at least one non-ionic surfactant, with the condition that the percentages of the different components of the sensor are such that the total does not exceed 100%.[ES] Sensor higrométrico basado en un material colagénico. La presente invención se refiere a un sensor higrométrico que comprende: a) entre un 35% y un 60% en peso respecto al peso total del sensor de un material colagénico seleccionado de lámina de colágeno y piel; b) entre un 2% y un 20% en peso respecto al peso total del sensor de al menos un tensioactivo iónico; c) entre un 30% y un 60% en peso respecto al peso total del sensor de al menos un tensioactivo no iónico; con la condición de que los porcentajes de los distintos componentes del sensor son tales que el total no supera el 100%.Peer reviewedConsejo Superior de Investigaciones Científicas (España)A1 Solicitud de patente con informe sobre el estado de la técnic

Determination of oxidation parameters of fatliquored leather by DSC

7 pages, 6 figures, 2 tables.-- Printed version published May 15, 2005.The oxidation of a number of fatliquoring formulations, of different iodine index, derived from fish oil, rapeseed oil, neatsfoot oil, lecithin, paraffin, sulphited and sulphated variants was studied. The formulations included dispersing agents, stabilizers and/or anti-oxidants. Sheepskins were treated with fatliquoring agents at 5% of fatty matter. The oxidation of the fatliquoring formulations and the fatliquored skins was studied by non-isothermal differential scanning calorimetry (DSC). The onset thermoxidation temperature and the enthalpy of the thermoxidation peak located between 195 and 265 °C were determined and then related to the different fatliquoring standard formulations. The skins were subjected to ageing treatments using UV radiation and temperature. The fall in the denaturation temperature of the skin due to ageing was related to the oxidability of the fatliquoring agent.This work has been supported by the European Commission through the CRAFT 1999-71638 Project.Peer reviewe

Synthesis of bis(pentachlorophenyl) silanediol and related compounds. Crystal structure of diethoxybis(pentachlorophenyl) silane

Bis(pentachlorophenyl) silanediol (3) has been prepared by neutral hydrolysis of perchlorodiphenylsilane (2). Reduction of 2 with LiAlH4 gives bis(pentachlorophenyl) silane (4) which upon treatment with bromine gives dibromobis(pentachlorophenyl)silane (5). Reaction of 2 with methanol and ethanol leads to dimethoxybis(pentachlorophenyl)silane (6) and diethoxybis(pentachlorophenyl)silane (7) respectively. The IR spectra of 2-7, as well as the UV and 1H NMR spectra of some of these compounds, are reported. The results of thermogravimetric and differential scanning calorimetric studies on silanediol 3 are discussed. The structure of the silane 7 has been established by X-ray crystallography. © 1992.Peer Reviewe

Effects of overlapping GB virus C/hepatitis G virus synthetic peptides on biomembrane models

12 pages, 8 figures, 6 tables.-- PMID: 15568870 [PubMed].-- Printed version published Dec 7, 2004.The present study was undertaken to examine the physicochemical properties of three overlapping peptides belonging to the E2 envelope protein of Hepatitis G virus (GBV-C/HGV) and its interaction with phospholipid biomembrane models using biophysical techniques. We describe our findings concerning the surface activity and the interaction of the peptides with monolayers and liposomes composed of the zwitterionic phospholipids dipalmitoylphosphatidylcholine and dimyristoylphosphatidylcholine (DMPC) and a mixture of DMPC with the anionic phospholipid dimyristoylphosphatidylglycerol. The results inform about the effect of the chain length on their interaction with biomembrane models. The longest chain peptide interacts in a higher extent with all the phospholipid studied as a result of a combination of hydrophobic and electrostatic forces.This work was funded by Grants BQU2003-05070-CO2-01/02 from the Ministerio de Ciencia y Tecnología (Spain).Peer reviewe

Thermal analysis and differential solubility of polyester fibers and yarns

7 pages, 3 figures, 4 tables.-- Printed version published May 2003.The differential sdlubility and thermal analysis of three kinds of polyester fibers designed for rotor, worsted ring, and carded ring spinning are measured. Poly(ethylene terephthalate) yarns are obtained through the three processes and then analyzed. Using a thermomechanical analyzer, the thermal transitions of the different yarn types are determined. The crystallinity of fibers and yarns is measured by DSC. The relationship between thermal transitions, crystallinity, and differential solubility of the polyester fibers and yarns is studied and some inferences on its fine structure are reported.Financial support through the 2001 Industry-CSIC (Departamento de Postgrado y Especialización) Postdoctoral Grant.Peer reviewe

Thermomechanical analysis of merino wool yarns

5 pages, 4 figures, 2 tables.-- Available online Jan 11, 2006.There is a difference in structure across the wool fibre which is usually referred to as bilateral. The endothermic denaturation doublet of keratins has been observed by different authors for a variety of keratins and measuring conditions and mainly interpreted by different theories. Merino wool yarns have been analyzed by the thermomechanical analysis and at low stress two thermal transitions before melting have been identified. These two thermal transitions are in accordance with the onset temperatures of the denaturation doublet shown by the DSC both at temperatures lower than the thermal degradation temperature determined by TG. The DSC of fibrillated fibres by abrasion showed not a denaturation doublet but just only a denaturation peak. The two transitions of the TMA and the modification of the DSC curve by abrasion seems to confirm that abrasion removes the component which denaturates at lower temperature.Authors are indebted the Spanish Ministry of Science and Education for its financial help through the Project MAT2004-04981-C03-03.Peer reviewe

Differential scanning calorimetry and elasticity of textured, heat set and mechanical strained polylactide multifilaments

Industrially textured PLA multifilaments were heat set under different conditions at 110 ºC for 1 min and subjected to one cycle of deformation up to 20%. Thermal transitions of the original textured, heat set and cyclic strained filaments were measured using differential scanning calorimetry from 25 to 250 ºC. Cyclic deformation induces an endo-exo transition at peak temperatures between 55 - 60 ºC that is not observed in the original textured and heat set multifilaments. There is another endo-exo transition with peak temperatures between 67 and 72 ºC in all filaments, the intensity of which varies according to texturing conditions, heat setting and cycle strain. Texturing conditions, heat setting and cyclic strain play a role in thermal transitions, the strain at breaking and elastic properties of the filaments. The crystallinity and magnitude of the endo-exo thermal events detected by DSC are related to the strain at breaking and elasticity of polylactide textured multifilament