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Various additives have been studied for effectiveness in rendering PPS colorfast against UV light. Only UV-absorber (screener) type stabilizers are found to work satisfactorily for PPS. Color changes (Δ E ) ≤ 2 after 50 h irradiation in a weather-Ometer have been obtained by bulk-adding a...
As a transformer ages, the chemical and physical properties of the cellulose insulation paper will change. For example, the average molecular weight of the cellulose chains decreases with age, as does the strength of the insulation paper. The molecular weight changes can be studied by several...
Mononuclear and hetero bi-trinuclear polymer complexes of nickel(II), copper(II) and oxovanadium(IV) chloride with 2-acrylamido-1-phenyl-2-aminothiourea (APATH) monomer derived from amidation of acryloyl chloride with 2-amino-1-phenylthiourea have been prepared. A few bi- or trimetallic polymer...
The photolysis of benzotriazole ultraviolet light absorber additives (Bz-UVAs) in acrylic/melamine clearcoats suggests that Bz-UVAs are destroyed by clearcoat-driven photooxidation chemistry. Tinuvin 900 is converted to parent benzotriazole and phenol ring oxidation products. Bz-UVAs are not...
Poly(vinyl alcohol) films, crosslinked by doping with potassium dichromate and heat treatment, have been investigated dielectrically as a function of curing temperature and curing time. It was found that increase of either curing time or curing temperature lowers the charge carrier mobility and...
Poly(1-acrylamido-2(2-pyridyl)ethane) homopolymer (PAEPH) and polymer complexes of 1-acrylamido-2(2-pyridyl)ethane with a number of bi- and tetravalent transition metals have been prepared and characterized using spectral ( 1 H- and 13 C-NMR, IR, UV-Vis) and thermal analysis, and magnetic...
The photodegradation of PPS as a result of UV irradiation manifests itself not only in yellowing and color-darkening, but also surface oxidation (conversion of S to S(O) x ), IR and UV-visible spectral changes, and partial loss of solubility (in hot 1-chloronaphthalene). The formation of...
The radiation chemistry of methacrylonitrile-styrene copolymers which were γ-irradiated at −196°C with different radiation doses has been investigated by ESR spectroscopy. The calculated G ( R . ) values show that the copolymers display significant radiation protection effects. The mechanism...
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