31.7: Polymer Structure and Physical Properties
网页2 天之前 · The fibers are then cooled and drawn out, which orients the crystallite regions along the axis of the fiber and adds considerable tensile strength Figure 31.7.2 31.7. 2. Nylon, Dacron, and polyethylene all have the semicrystalline structure necessary for being drawn into oriented fibers. Figure 31.7.2 31.7. 2: Oriented crystallite regions in a ...
Hierarchical Structure in Polymeric Materials | Science - AAAS
网页It is instructive to consider a hierarchical organization of structure in polymers at four successive levels—the molecular, nano-, micro-, and macrolevels—and to examine how interactions at and between these various levels of structure have important and often quite specific influences.
30.6: Polymer Structure and Physical Properties
网页To account for the physical differences between the different types of polymers, the nature of the aggregate macromolecular structure, or morphology, of each substance must be considered. Because polymer molecules are so large, they generally pack together in a non-uniform fashion, with ordered or crystalline-like regions, called crystallites ...
Basic Polymer Structure | MATSE 81: Materials In Today's World
网页Basic Polymer Structure. There are four basic polymer structures which are shown in the figure below. In practice, some polymers might contain a mixture of the various basic structures. The four basic polymer structures are linear, …
Structural Hierarchy of Polymers - SpringerLink
网页Polymeric materials show a large variety of molecular and supramolecular structures, ranging in size from about 0.1 nm to 1 mm. In this chapter, an overview is initially provided of macromolecular structural parameters, including constitution, configuration, conformation, the coil diameter and the macromolecule size.
31.7 Polymer Structure and Physical Properties - OpenStax
网页In general, polymers can be divided into four major categories, depending on their physical behavior: thermoplastics, fibers, elastomers, and thermosetting resins. Thermoplastics are the polymers most people think of when the word plastic is mentioned. These polymers have a high glass transition temperature and are therefore hard at room ...
28. Polymers: Structure & Composition - MIT OpenCourseWare
网页Describe a polymer’s structure in terms of –mer type ordering, tacticity, and backbone chain configuration. Explain how polymer structure determines material properties, such as flexibility or transparency. Explain how crosslinking produces the characteristic properties of …
Four Types of Protein Structure - ThoughtCo
网页2024年7月26日 · The four levels of protein structure are distinguished from one another by the degree of complexity in the polypeptide chain. A single protein molecule may contain one or more of the protein structure types: primary, secondary, tertiary, and quaternary structure.
Polymer Structure - an overview | ScienceDirect Topics
网页Polymers are materials that consist of many, thousands, of repeating units. Polymer structure is in general used because of their lightness, elasticity, and process ability [6,7]. These structures, usually, show a lesser amount of mechanical properties such as low strength and low stretch modulus as compared with metals and ceramics.
Structural Science of Crystalline Polymers - Springer
网页2024年4月4日 · The physical properties of polymers are intimately related to the structural evolution in the crystallization process and also the structural changes in the samples subjected to an external field. Concrete methods and examples are introduced for these studies, making the book a useful and practical guide for young professional researchers ...
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