Polymers are very useful materials because their structures can be altered and tailored to produce materials 1) with a range of mechanical properties 2) in a wide spectrum of colors and 3) with different transparent properties. Ref INTRODUCTION TO POLYMERS 2nd edition, R. J. The identity and amount of the reagent used to crosslink the polymer chains. In both the approaches, the polyamide is melt and drawn after cooling to obtain the desired properties of every intended use. 21.2 MECHANICAL PROPERTIES OF POLYMERS Polymer Structure. The reagent used to initiate the polymerization reaction. Shape and structure dictate a polymer material’s behavior—how strong it is, how flexible, how responsive to temperature and even whether it can conduct electricity. 5.1 PROPERTIES OF POLYMERS As noted above, synthetic HDPE macromolecules have masses ranging from 105 to 106 amu (LDPE molecules are more than a hundred times smaller). Dr. Ying-Chieh Yen ??? The latter concern the chain as a whole, i.e. The former are related to the polymer fine structure, i.e. The nylon is referred to as nylon 6 if n = 5 which is another common form of this polymer. Contributors; A comparison of the properties of polyethylene (both LDPE & HDPE) with the natural polymers rubber and cellulose is instructive. The organization and index make the book readily usable as a reference book. The commercial production of nylon 6 starts with caprolactam that use an open-ring polymerization. the type of monomeric unit forming the chain that affects the sample crystallinity and the physical properties. Chemists have also learned to synthesize new polymers from simple chemicals, creating a vast array of plastics and synthetic fibers. Types of thermophysical properties available for any polymer will depend on its structure (polymers can have the same chemical structure, but different physical structures depending on their formation and processing conditions) considering the presence of branching, crosslinking, distribution of chain … Many of the useful properties of polymers are in fact unique to polymers and are due to their long chain molecular structure. Title: Polymer Structures and Properties 1 Polymer Structures and Properties Polymer Research Center Institute of Applied Chemistry of NCTU. Young and P. A. Lovell. cessful for the prediction of the polymer properties start-ing from the knowledge of their molecular structure, is the topological index approach developed by Bicerano and coworkers, which uses a connectivity index and is the basis for commercial simulation packages that predict polymer properties [7]. Physical Properties: Physical properties of polymers include molecular weight, molar volume, density, degree of polymerization, crystallinity of material, and so on. Properties of Nylon. [A]n excellent introduction to a subject whose engineering importance is rapidly increasing. polymers produced by plants and animals, primarily proteins (collagen, keratin) and carbohydrates (cellulose, starch). The monomer polymerized or the monomers copolymerized. The following variables can be controlled when producing a polymer. These issues will be discussed at length in the next chapter. Properties of Polymers . Polymers range from familiar synthetic plastic such as polystyrene to natural bio-polymers such as DNA and proteins that are fundamental to biological structure and function. A concise, illustrated presentation of polymer structure and bonding. Engineering polymers include natural materials such as rubber and synthetic materials such as plastics and elastomers. 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