Search Results

You are looking at 1 - 10 of 151 items for :

  • "polyethylene glycols" x
  • Refine by Access: All Content x
Clear All
Cereal Research Communications
Authors:
A. Comeau
,
L. Nodichao
,
J. Collin
,
M. Baum
,
J. Samsatly
,
D. Hamidou
,
F. Langevin
,
A. Laroche
, and
E. Picard

glycol 6000, and its variation with temperature. J. Exp. Bot. 32 :861–866. McClendon J.H. The osmotic pressure of concentrated solutions of polyethylene glycol 6000, and its variation

Restricted access

with varying concentrations of a mixture of two polymers: a water-insoluble polymer, ethylcellulose (EC), and a water-soluble polymer, polyethylene glycol-6000 (PEG-6000). EC, if used alone, a hydrophobic water-impermeable matrix would be formed

Open access
Journal of Thermal Analysis and Calorimetry
Authors:
X. Han
,
Y. Hu
,
Z. Lin
,
S. Li
,
F. Zhao
,
Z. Liu
,
J. Yi
,
L. Zhang
, and
X. Ren

Abstract  

Effects of fullerenes including FS, EFS and pure C60 on thermal behaviors of polyethylene glycol (PEG) have been studied by employing thermogravimetry-differential thermogravimetry (TG-DTG), differential scanning calorimeter (DSC) and off-line furnace-type pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). The products were collected by Cambridge filter pad which was widely used in analyzing the combustion products of cigarette. The results showed that the addition of fullerenes obviously restrained the thermal decomposition of PEG. The initial decomposition temperatures (IDT) and maximum decomposition peak temperatures (MDT) were evidently postponed by the addition of fullerenes. Pyrolysis products with one or two hydroxyl end groups obviously increased with the addition of 10% C60. The reasons of the changes were discussed from the aspects of reaction mechanisms.

Restricted access

Abstract  

The extraction of cesium and barium cations into nitrobenzene and 60% (vol.%) nitrobenzene +40% CCl4 mixture in the presence of dicarbollide (+Slovafol 909), and primary alkylammonium cations has been studied. Extraction constants determined for three methylammonium cations correlate well with their hydration enthalpies. Reverse order of the hydrophobicity of methylammonium cations (competition with bare Cs+ ion) and of their tendency to enter the polyethylene glycol complex (competition with polyethylene glycol complexed Cs+ and Ba2+ ions) is recorded. The possibility of the regeneration of the organic phase after stripping of Cs+ and Ba2+ ions with methylammonium cations has been investigated.

Restricted access

Abstract  

Polyethylene glycol methacrylate (PEGMA) with different polyethylene oxide units were grafted onto polypropylene (PP) films by a preirradiation grafting method. The effect of co-solvent system on the degree of grafting and water contact angle were determined, respectively. The grafted sample films were verified by Fourier Transform Infrared (FTIR) spectroscopy in the attenuated total reflectance mode (ATR). The biocompatibility and blood compatibility of the grafted PP films were evaluated by the determination of protein adsorption, platelet adsorption and thrombus.

Restricted access

Abstract  

A new polyethylene glycol supported chiral monosulfonamide was conveniently synthesized from (R,R)-1,2-diphenylethylenediamine. The ruthenium catalyst prepared from polyethylene glycol supported chiral monosulfonamide with [RuCl2(p-cymene)]2 was used in the asymmetric transfer hydrogenation of prochiral ketones in neat water with good to excellent conversions and enantioselectivities. The catalyst could be easily recovered and reused several times.

Restricted access

Abstract  

A modified isoconversional method is applied to perform the kinetic analysis of non-isothermal processes. The solidification process of a polyethylene glycol with a mean molecular of 4000 (PEG 4000) was here analyzed. It was stated that the Avrami model provides a good description of the solidification process. Temperature-cooling rate-transformation diagrams were constructed and there was a good agreement between experimental data and the calculated T-CR-T curves. Moreover, morphological qualitative analysis has been performed by means of scanning electron microscopy.

Restricted access

Abstract  

We describe a radioimmunoassay procedure for human somatotropin using second antibody — polyethylene glycol (PEG) combination for the separation of antibody bound and free antigen. The assay is done by a single incubation of 18 hours or with one hour pre-incubation and 3 hours post-incubation at room temperature (25 °C) and uses 0.1 m of serum sample. The assay covers a range of 0–40 g/ and has a sensitivity of 0.6 g/ of somatotropin. The assay is validated by inter-assay and intra-assay variations, recovery and parallelism tests.

Restricted access

Abstract  

The extraction of strontium and cesium ions from high ionic strength acid, base, and salt solutions into an organic extractant consisting of alkyl cobalt dicarbollide and polyethylene glycol (PEG) in diethylbenzene was investigated. Adding hexaethylene glycol or PEG-400 improved the strontium extraction ≥100-fold, while cesium extraction was decreased at high PEG concentrations. The extractions are rapid and selective, even in the presence of molar concentrations of sodium ion, suggesting that alkyl cobalt dicarbollide extractants are useful for the treatment of alkaline nuclear wastes. A method for the synthesis of tetra-n-hexyl(cobalt dicarbollide) is described.

Restricted access

Abstract  

The extraction behavior of several metal ions viz., Am3+, Eu3+, UO2 2+, Th4+, Sr2+ and Cs+ was investigated from sulphate medium employing phosphotungstic acid (PTA) and polyethylene glycol (PEG). The influence of various parameters such as pH, PTA concentration, PEG concentration and salt concentration was studied. The order of extraction followed the trend: Am3+>Eu3+>>Th4+>UO2 2+>Sr2+>Cs+ which deviate significantly from the reported order with conventional solvents. The relatively poor extraction of UO2 2+, Sr2+ and Cs+ was ascribed to their lack of interaction with the phosphotungstate anion. The separation behaviour of Am3+ vis-a-vis Eu3+ was also investigated under different experimental conditions.

Restricted access