Determination of antioxidants in polymeric materials.
A review of methods proposed for the analysis of antioxidants in polymeric materials, cast in the form of a step-by-step examination of the problems involved in any scheme of analysis, with a critical appraisal of the published procedures designed to overcome them.
The Analysis of Antioxidants and Accelerators in Rubber Compounds and Vulcanizates
Abstract In the rubber industry the number of accelerators and antioxidants has increased greatly in the last few years. Van Alphen even in 1956 described 154 accelerators and 87 antioxidants of different chemical structure. The detection of such a large number of materials, depending on their combination in stocks, is more or less difficult, although the detection of the presence of one or another compound often makes possible a prejudgment as to which other substances can be counted on and which cannot. Besides the chemically homogeneous accelerators and antioxidants, use is also made of mixtures as combination products. The individual components are qualitatively detectable in mixtures. Information on the type of these products is given by quantitative determination methods such as described by Zijp, Kortum, Szalai and Szoke, among others. The original substances are often chemically altered during vulcanization or later in the preparation of samples for testing; e.g., symmetrically constituted disubst...
A weighing method for measuring the induction period of marine and other oils
SummaryA convenient method for measuring the length of the induction period of marine and other oils and unsaturated fatty acid esters depends upon determining the increases in weight. Small amounts of oil with or without additives are held in constant temperature ovens and weighed at regular intervals. Some of the details of technique are described.