The commercial production of nylon 6 starts with caprolactam that use an open-ring polymerization. As noted above, synthetic HDPE macromolecules have masses ranging from 105 to 106 amu (LDPE molecules are more than a hundred times smaller). 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. [A]n excellent introduction to a subject whose engineering importance is rapidly increasing. The identity and amount of the reagent used to crosslink the polymer chains. polymers produced by plants and animals, primarily proteins (collagen, keratin) and carbohydrates (cellulose, starch). Properties of Nylon. The nylon is referred to as nylon 6 if n = 5 which is another common form of this polymer. The text is very well written and illustrated. The monomer polymerized or the monomers copolymerized. From the molecular shape itself—star, comb or brush—to how those molecules are arranged, our researchers are finding new ways to build polymers to unlock coveted properties that will provide the foundation for Young and P. A. Lovell. Properties of Polymers . Chemists have also learned to synthesize new polymers from simple chemicals, creating a vast array of plastics and synthetic fibers. A concise, illustrated presentation of polymer structure and bonding. considering the presence of branching, crosslinking, distribution of chain … The following variables can be controlled when producing a polymer. Polymer Structure. The reagent used to initiate the polymerization reaction. Physical Properties: Physical properties of polymers include molecular weight, molar volume, density, degree of polymerization, crystallinity of material, and so on. 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. 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) Ref INTRODUCTION TO POLYMERS 2nd edition, R. J. Many of the useful properties of polymers are in fact unique to polymers and are due to their long chain molecular structure. Engineering polymers include natural materials such as rubber and synthetic materials such as plastics and elastomers. the type of monomeric unit forming the chain that affects the sample crystallinity and the physical properties. These issues will be discussed at length in the next chapter. 21.2 MECHANICAL PROPERTIES OF POLYMERS Dr. Ying-Chieh Yen ??? 5.1 PROPERTIES OF POLYMERS In both the approaches, the polyamide is melt and drawn after cooling to obtain the desired properties of every intended use. Contributors; A comparison of the properties of polyethylene (both LDPE & HDPE) with the natural polymers rubber and cellulose is instructive. 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. The former are related to the polymer fine structure, i.e. Title: Polymer Structures and Properties 1 Polymer Structures and Properties Polymer Research Center Institute of Applied Chemistry of NCTU. 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