Twenty-one papers collected here report on the latest work in polymer ageing, looking at aspects including the ageing of polyester resin under moisture action, kinetic peculiarities of synthesis of Adamantan- containing polyamidoacids and polyimides, the influence of intensive mechanical treatment on decomposition of barium peroxide, and ecological aspects of manufacture and application of highly pure liquid substances. Biodegradable blends of starch and cellulose derivatives, the quantum chemical calculation of components of biosynthesis of adrenaline, low combustible poly(vinyl chloride) compositions with mixtures of plasticiSers, and inhibited oxidation of polypropylene melt are some other topics discussed.