Second Example from Material Science

The second thematic section of the volume will cover some questions from the more theoretical side. In particular, we willbeconcernedwiththe (eventual) use of cross-conjugated systems in material science. Compared to linear conjugation, cross-conjugation leads to very different chemical and physical properties, and these should have a strong influence on, for example, the photophysical properties of the respective compounds. 

This book describes the science and practice behind the materials in foods that impart their desirable properties. The first part of the book describes those physicochemical aspects that intervene in the organization of food components from the molecular level to actual products and methods used to probe into foods at different length scales. The second part explains how food structures are assembled during processing in order to achieve desirable and recognizable properties. Processed foods are mostly metastable structures in which water, air, and lipids are immobilized as dispersed phases within a polymeric matrix of proteins, polysaccharides, or a fat crystal network. The last section of the book presents specific examples of how structures of familiar products are obtained by processing and describe some new developments. 

In this chapter, we present typical applications of ESR spectroscopy to polymer science, whieh include structures and molecular motions of polymer chains and chemical reactions in the polymer material. The first part deals with ESR parameters derived from speetra and the molecular information of polymer chains. In the second part, examples of applications to polymer science are introduced. In the following section, the close relations between structure, molecular motion and chemical reactions are discussed. The narrative will illustrate how these studies have made a considerable contribution to polymer physics and chemistry especially describing mechanisms of deteriorations, polymerization and relaxation phenomena of solid polymers. 

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