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The influence of UV radiation on the shape of infrared spectra of collagen from a rat tail tendon was studied. The spectra were resolved into Gaussian components by means af an iterative computer program. Characteristic absorption peaks for the resolved components were obtained. After UV...
Thermal parameters of collagen before and after UV irradiation were determined in air and nitrogen atmospheres. After UV irradiation of collagen, mass decrement, activation energy and entropy changes were apparently changed and may give information about the phototransformations which occur in...
The kinetics of 4,4′-bis(2,6-di- tert -butylphenol) (BP) consumption in the oxidation of polypropylene (PP) (at 130 °C, in air) has been studied. It is shown that 3,3′,5,5′-tetra- tert -butyl-4,4′-diphenoquinone (DPQ) is the main product of conversion on starting BP. A synergism has been...
The nature of the peroxides formed during thermooxidative degradation of polypropylene is still a subject of discussion. It is clear that these peroxides consist of a fast and a slowly decomposing fraction. This paper describes the results of two different iodometric determination methods, as...
Copolymers of glycidyl methacrylate and methyl methacrylate with widely differing compositions have been studied by thermal volatilisation analysis (TVA), thermogravimetry (TG), differential thermal analysis (DTA) and pyrolysis-mass spectrometry (Py-MS) techniques. The apparent activation...
As a part of continuing studies on the change in solubility characteristics of water-borne flexo ink binders, the thermal behaviour of unneutralized and partially or completely neutralized acrylic copolymer and styrene-maleic anhydride copolymer has been examined relative to a water-based ink...
The thermal degradation products of four polythiophenes were investigated by using pyrolysis-gas chromatography with a flame ionisation detector (FID) and a sulphur-selective flame photometric detector (FPD). The influence of pyrolysis temperature (550–1400 °C) and sample size (5–20 μg)...
It is shown that cross-linked dextrans can be the basis for obtaining a drug reservoir which is a physiologically active polymer with the drug grafted to the matrix by chemical links. A drug form for treatment of tuberculosis has been obtained. The kinetics of drug release into model media and...
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