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The work is an attempt to better understand polyethylene processing in air. This requires first of all good knowledge of the functional groups formed on processing in air. Secondly, it requires the precise rate laws for the formation of these functional groups. To this avail, the experimental...
Lithium salts-containing hybrids were prepared by hydrolysis-condensation of tetramethoxysilane (TMOS) in solution in N , N -dimethylacetamide(DMAc) containing 10 wt% trifluoromethanesulfonate (LiCF 3 SO 3 ) and (3-aminopropyl)methyl diethoxysilane (APrMDEOS) terminated amic acid. Infrared (IR),...
We have studied the correlation between thermal stability and molecular structure, for some copolyethers. Thermal stability was evaluated from thermogravimetric analyses and molecular modeling. The oligomers were synthesized by a phase transfer catalysis technique, starting from...
The photochemical evolution of poly(ether ether ketone) (PEEK) has been investigated under polychromatic irradiation ( λ >300 nm) in the absence and in the presence of oxygen. The modifications of the structure of the films resulting from irradiation was monitored by Fourier transform infrared...
The synthesis of some substituted arylamines is described. These substances were tested as antioxidants, both in liquid hydrocarbons and in polymers. Their effectiveness was compared with common additives and some conclusions about possibility of their use is made.
To determine the thermo-oxidative degradation mechanism of a copolymer of poly(butylene terephthalate) and polybutylene oxide, degradation experiments were carried out on this polymer and a model compound (dibutyleneglycol dibenzoate) at 140°C in an oxygen atmosphere. The changes were analysed...
The ash-AQ lignin from the black liquor of oil palm empty fruit bunch was fractionated into four fractions by successive extraction with organic solvents of increasing hydrogen-bonding capacity. A comparison study of the lignin heterogeneity between the fractions was made in terms of fractional...
Polyisoprene and polychloroprene have been cross-linked either in solution or in solid state using free radical initiators. In the comparable experimental conditions higher cross-linking density was observed in the solid state process. Independent of the cross-linking method, polychloroprene...
The surface photo-oxidation and photostabilization of photocross-linked polyethylene (XLPE) have been studied by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The FTIR and XPS data gave the evidence that the surface photo-oxidation of XLPE increases,...
The processes of thermal degradation taking place in polyamide 6 (PA6) blends with functionalized (PP1-g-DEM) and non-functionalized polypropylene (PP2) have been studied by thermogravimetric analysis. Coats–Redfern, Van Krevelen and Horowitz–Metzger integral methods were used to determine...
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