The need for writing a monograph on polymer blends and composites became apparent during presentation of material on this subject to our advanced polymers class. Although the flood of important research in this area in the past decade has resulted in many symposia, edited collections of papers, reviews, contributions to scientific journals, and patents, apparently no organized presentation in book form has been forthcoming. In a closely connected way, another strong impetus for writing this monograph arose out of our research programs in the Materials Research Center at Lehigh University. As part of this effort, we had naturally compiled hundreds of references and become acquainted with many leaders in the field of blend and composite research. Perhaps the most important concept stressed over and over again is that engineering materials are useful because of their complexity, not in spite of it. Blends and composites are toughened because many modes of resistance to failure are available. Although such multimechanism processes are diffi cult to describe with a unified theory. we have presented available develop ments in juxtaposition with the experimental portions. The arguments somewhat resemble the classical discussion of resonance in organic chemistry, where molecular structures increase in stability as more electronic configura tions become available.

This Handbook is a fundamental reference work on polymer blends, covering all aspects: science, engineering, technology and application. It will appeal to anyone working in the field of blends, researchers as well as engineers. The Handbook is designed to be the source of information on all aspects of polymer blends. To this end the editor has put together an international group of highly respected contributors, each an expert in his chosen subjects. Polymer Blends Handbook, Volume 1 and Volume 2 is an exceptional source of information that will prove invaluable for anyone blending polymers. An&electronic version of the Polymer Blends Handbook by Utracki is available.

This unique volume covers the results of the world-wide efforts to implement natural polymers as engineering plastics and the use of their inherent properties. The processing opportunities and the applications of the natural materials as reinforcement of polymer composites are discussed, including the structural, morphological and thermal characterization as well as the mechanical behavior of the obtained materials. Also covered is the preparation of biodegradable homopolymers, blends and composites, which involves chemical reactions, regardless of the type of the starting material.