Chemical categorization plastics

As shown in Fig. 1, plastics are classified as thermoplastics, elastomers, and duroplastics. In practice, classification is made in accordance with a number of different aspects. In Fig. 1, thermoplastics are categorized in physical terms (according to stmcture), elastomers in chemical terms (double bond), and duroplas-tics according to process pressure. 

Biodegradable plastics can be categorized in a number of ways. They can be divided into synthetic plastics and natural plastics, into biobased and nonbiobased plastics, or by polymer family. The reported chemical compositions of various biodegradable plastics, as compiled from various sources, are shown in Table... 

Abstract This article reviews recent developments in synthesis and characterizations of organic difluoramine (NF2) derivatives since the 1980s. Specific classes of chemical compounds are covered cyclic difluoramino-nitramines, especially gem-bis(difluoramino)-substituted analogs of conventional nitramines products from the relatively new transformation of elec-trophUic difluoramination other classes of difluoramines such as polymers, plasticizers, and compounds not otherwise categorized. Also covered are aspects of other recently developed synthetic methodology to prepare compounds in this general class, as well as purely theoretical treatments of the chemistry and properties of this class. 

Understanding how to process agro-polymers with similar properties to synthetic polymers requires an understanding of how these forces are manifested in proteins. The processability of proteins depends on their transition from the glassy to rubbery and viscous-flow states. These transitions are achieved with judicial application of heat, pressure, shear, chemical additives and plasticizers. Specific amino acid residues (primary protein structure) and initial structure (natural protein state) of the protein will influence each of these factors. Based on the structure of proteins and the requirement for thermoplastic processing, three broadly categorized processing requirements have been identified ... 

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