Classification polymer materials modifications

The concepts of positive or negative systems are by no means a strict classification since modifications of the original pre-polymer with additives, with suitable changes In the development processes can be utilized to obtain positive resists whilst the unmodified material Is a negative resist. For example, tetra-chloro dlazo cyclopentadienes in general are polymerisable by UV light to obtain negative resist systems. 

To test this novel architecture as a tool for classification, a simulated experiment was performed. The case of chemo-resistive sensors was considered because of the simple involved electronics. This class of sensors is rather wide and can include sensors based either on inorganic (e.g. metal-oxide semiconductors) or organic (e.g. conducting polymers) sensitive materials. The concepts here illustrated can be extended, with a proper modification of the AORN architecture, to different kinds of chemical sensors. Actually, the features of the olfactive epithelium define the following structure of the AORN. 

Proteins are natural, renewable, and biodegradable polymers which have attracted considerable attention in recent years in terms of advances in genetic engineering, eco-friendly materials, and novel composite materials based on renewable sources. This chapter reviews the protein structures, their physicochemical properties, their modification and their application, with particular emphasis on soy protein, zein, wheat protein, and casein. Firstly, it presents an overview of the structure, classification, hydration-dehydration, solubility, denaturation, and new concepts on proteins. Secondly, it concentrates on the physical and chemical properties of the four important kinds of proteins. Thirdly, the potential applications of proteins, including films and sheets, adhesives, plastics, blends, and composites, etc. are discussed. 

The most significant factor in determining the material properties of a polymer is the structure of the monomer(s) selected for polymerization. Monomer choice dictates both side chain and backbone structure, the latter which determines the polymer classification. Even minor changes to the chemical modification of a monomer (and the resulting polymer) can have drastic effects on polymer solubility, mechanical strength, crystallinity, and sensitivity to degradation. Consequently, the choice of monomer also often dictates the manner in which the material can be processed for biomedical applications. 

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