Search Results

You are looking at 1 - 10 of 21 items for :

  • "phase transition" x
  • Chemistry and Chemical Engineering x
  • Refine by Access: Content accessible to me x
Clear All

applications, the main characteristics include the encapsulation efficiency, the ratio of phospholipids to encapsulant concentration, and the temperature of phase transition ( T c ). When lipid bilayers prepared from pure one-component phospholipids are

Open access
Journal of Thermal Analysis and Calorimetry
Authors: A. Sykuła-Zając, E. Łodyga-Chruścińska, B. Pałecz, R. E. Dinnebier, U. J. Griesser, and V. Niederwanger

Exothermic phase transition was observed at above 150 °C (after the dehydration process) on the DSC curve at 10 °C min −1 . The transition starts and ends at 170.80 and 210 °C, respectively (see inset in Fig. 2 ). The phase transition ( E exo = −5.2 mW

Open access

ambient [ 16 , 17 ] and at low temperature [ 18 ] and at high pressures [ 19 ]; however, no solid–solid phase transition has been detected. Earlier heat capacities of samples of l -cysteine and l -cystine were measured in the temperature range

Open access

sample in air to the enthalpy of the β–α phase transition in quartz on cooling the same sample. Quartz (Qz, SiO 2 ) is the most commonly found mineral on the Earth's surface and is ubiquitously present in soils [ 16 , 17 ]. On heating at ambient pressure

Open access
Journal of Thermal Analysis and Calorimetry
Authors: G. Janowska, A. Kucharska-Jastrzabek, W. M. Rzymski, and A. Pajak

Abstract

The article describes the measurements results of the thermal properties of cross-linked blends of butadiene–acrylonitrile rubber (XNBR, Krynac X.7.50) and chlorosulfonated polyethylene containing different quantity of combined chlorine (CSM24—Hypalon 48, CSM29—Hypalon 20, CSM35—Hypalon 40, and CSM43—Hypalon 30) under inert gas (DSC) and in air (derivatography). The blends were non-conventionally cross linked at a temperature of 150 °C by means of MgO in the presence of stearic acid. The thermal curves obtained were interpreted from the point of view of phase transitions and chemical reactions of the macromolecular components used. It has been found that the elastomers investigated show a good compatibility brought about by the formation of both interpolymeric covalent bonds and interpolymeric and intrapolymeric ionic bridges, which play the role of a chemical compatibilizer. The results of the examinations performed show that the non-conventional cross-linked XNBR/CSM blends prove very good mechanical properties and are self-extinguished in air. Their flammability defined with the value of OI and combustion time in air clearly depends on the type of CSM.

Open access

Introduction Differential scanning calorimetry (DSC) is extensively used in chemistry and physics to analyze, e.g. phase transitions of different compounds [ 1 , 2 ]. Recently this technique has been used with increasing

Open access
Journal of Thermal Analysis and Calorimetry
Authors: Dariusz Szychowski, Barbara Pacewska, Grzegorz Makomaski, Janusz Zieliński, Wiesława Ciesińska, and Tatiana Brzozowska

. Obtained DSC curves allowed determination of the phase transition temperatures: glass transition temperature, melting temperature, the onset of crystallization temperature, and the onset of decomposition temperature. Measurement parameters were

Open access

related to the size of the pore, in which the liquid is trapped [ 15 ]. A liquid to solid phase transition requires formation of crystallization nuclei. In fact, such a nucleus must reach a critical radius, which allows it to start the growth of

Open access

all sources of radiative and convective energy have been applied to flow reactors, delivering fast and efficient access to a wide range of reaction conditions [ 12 – 14 ]. Depending on the intensity of the supplied energy, phase transitions (e

Open access

enthalpies (Δ H ) of phase transitions of the CTP attained the following values: the transition from the brittle to the viscoelastic state (51.2 °C, Δ H = −2.386 J/g), melting point (97.4 °C, Δ H = −0.030 J/g), onset of decomposition (307.6 °C

Open access