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Polymer degradation is a change in the properties -- tensile strength, colour, shape, etc -- of a polymer or polymer based product under the influence of one or more environmental factors such as heat, light or chemicals. These changes may be undesirable, such as changes during use, or desirable, as in biodegradation or deliberately lowering the molecular weight of a polymer. Such changes occur primarily because of the effect of these factors on the chemical composition of the polymer. In a finished product such a change is to be prevented or delayed. However, the degradation process can be useful from the view points of understanding the structure of a polymer or recycling/reusing the polymer waste to prevent or reduce environmental pollution. Polymers molecules are very large on the molecular scale which derive their unique and useful properties from their size.
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The papers in this anthology were presented during seven ANTEC and RETEC symposia between 1995 and 1998, and chronicle many of the advances in the plastics coloring technology field during that time span. The unifying theme of the papers is ""creating more value."" The interactivity of the package design process has continued to demand advances in coloring technology, and the value of being able to exploit product appearance is glaringly apparent. Another way to create value is by being responsive through ""Speed to Market."" Manufacturers and suppliers have to respond to the demand of their consumers, yet fabricators cannot be ignored in their desire for first run acceptance of color. All these issues and many others are discussed within this authoritative overview of coloring technology.
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Li and Reuveny use an interdisciplinary social-scientific approach to investigate today's key political, economic, and environmental issues.
This impressive compilation offers a nearly complete listing of sound recordings made by American minority artists prior to mid-1942. Organized by national group or language, the seven-volume set cites primary and secondary titles, composers, participating artists, instrumentation, date and place of recording, master and release numbers, and reissues in all formats. Because of its clear arrangements and indexes, it will be a unique and valuable tool for music and ethnic historians, folklorists, and others.
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