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.

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, branched, crosslinked, and networked.

THE STRUCTURE of POLYMERS: Hydrocarbon Molecules • Most polymers are organic, and formed from hydrocarbon molecules • Each C atom has four e- that participate in bonds, each H atom has one bonding e- • Attachment of different organic groups to the hydrocarbon backbone offers wide variety of possible polymers

2024年9月23日 · 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.

2024年12月11日 · polymer, any of a class of natural or synthetic substances composed of very large molecules, called macromolecules, that are multiples of simpler chemical units called monomers. Polymers make up many of the materials in living organisms, including, for example, proteins, cellulose, and nucleic acids.

The common types of polymer structures are linear, branched, cross-linked, and networked. These classifications are based on the physical arrangement and connectivity of the polymer molecules.

What are the basic microstructural features? How are polymer properties effected by molecular weight? How do polymeric crystals accommodate the polymer chain? What is a polymer? Callister 7e. Adapted from Fig. 14.1, Callister 7e. • Molecular weight, Mi: Mass of a mole of chains. Adapted from Fig. 14.4, Callister 7e.

Many polymeric materials having chain-like structures similar to polyethylene are known. Polymers formed by a straightforward linking together of monomer units, with no loss or gain of material, are called addition polymers or chain-growth polymers.

Polymer Structure. Engineering polymers include natural materials such as rubber and synthetic materials such as plastics and elastomers. 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 ...

• What are the general structural and chemical characteristics of polymer molecules? • What are some of the common polymeric materials, and how do they differ chemically? Chapter 14: Polymer Structures Chapter 14 - 1 • How is the crystalline state in polymers different from that in metals and ceramics ?