Search Results

You are looking at 31 - 40 of 317 items for :

  • Chemistry and Chemical Engineering x
  • All content x
Clear All
Restricted access

Abstract  

The thermal behaviour of an epoxy resin cured with an amine-POSS was studied using differential scanning calorimetry (DSC) and thermogravimetric (TG) analysis. The kinetic of polymerization reaction and the thermal degradation have been analyzed based on an iso-conversional model. The obtained results showed that the activation energies of both processes depend on the degree of conversion.

Restricted access

Abstract

Cycloaliphatic epoxy resin has been successfully thermally cured using a polyamino siloxane oligomer as hardener. The curing reaction was followed by infrared spectroscopy in the near range, and thermal transitions were measured by dynamic mechanical thermal analysis. The use of accelerants and a plasticizer (dodecylphenol), and different curing schedules were explored. Cured materials showed high Tg values (around 125–164 °C), and the analysis of laser scanning confocal microscopy images showed that they are homogeneous in the microscale.

Restricted access

Abstract  

We have developed a material that can be used to remove cesium (Cs) in Fukushima Prefecture and other contaminated areas. The developed material was prepared by radiation-induced graft polymerization of ammonium 12-molybdophosphate and acrylonitrile onto nonwoven polyethylene fabric. To evaluate the adsorption performance of the developed material, we conducted batch and column experiments by using a Cs solution with a concentration of 1 ppm at pH 7. In the batch study, the adsorbent was able to remove 90, 87 and 64 % of Cs from pure water, acidic water and seawater, respectively. In the column study, adsorbent packed in a column with a diameter of 7 mm and a height of 5 cm was able to remove nearly the entire amount of dissolved Cs. The solution (1 ppm Cs at pH 7) was pumped into the column at a space velocity of 300 h−1, in which the Cs adsorption capacity at the breakthrough point reached 54 g-Cs/kg-adsorbent. Adsorbent grafted into a cartridge with a diameter of 4 cm and a height of 3.8 cm was used in a field test on removing dissolved radioactive Cs in Iitate-mura, and this test was conducted successfully.

Restricted access

photolysis to identify all possible degradation products; (ii) to characterize the degradation products by using liquid chromatography hybrid triple quadrupole linear ion trap mass spectrometry (LC–QqLIT-MS) and liquid chromatography hybrid ion trap

Open access

treatment different types of coatings are possible: (a) inorganic (SiO 2 ) coatings using high temperatures in order to sintherized the film and to degrade the organic compounds and (b) hybrid organic–inorganic sol–gel coatings, in this case we use much

Restricted access

ecological zones of West Africa . Field Crops Res. 60 : 189 – 199 . Balko , L. G. , Russell , W. A. ( 1980 ) Effects of rates of nitrogen fertilizer on maize inbred lines and hybrid

Open access

sunflower oil obtained from Carnia hybrid and pork lard were the matrix used for antioxidants incorporation. Materials and methods Plant material Herbarium information of the seven plant species which are

Restricted access