03Lecture-p2-ch8 - Manufacturing and Production Processes...

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Manufacturing and Production Processes ENGR 3190U – Lecture 03 – Part 2 Chapter 8 - Polymers sections 8.0, 8.2, 8.3, 8.4 1. Thermoplastic Polymers 1. Thermosetting Polymers 1. Elastomers 1. Guide to the Processing of Polymers
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Polymer A compound consisting of long‑chain molecules, each molecule made up of repeating units connected together Most polymers are based on carbon and are therefore considered organic chemicals Nearly all polymers used in engineering are synthetic They are made by chemical processing Polymers are synthesized by joining many small molecules together into very large molecules, called macromolecules , that possess a chain‑like structure
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Types of Polymers Polymers can be separated into plastics and rubbers As engineering materials, it is appropriate to divide them into the following three categories: 1. Thermoplastic polymers 2. Thermosetting polymers 3. Elastomers where (1) and (2) are plastics and (3) are rubbers
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Examples of Polymers Thermoplastics : Polyethylene, polyvinylchloride, polypropylene, polystyrene, and nylon Thermosets : Phenolics, epoxies, and certain polyesters Elastomers : Natural rubber (vulcanized) Synthetic rubbers, which exceed the tonnage of natural rubber
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Thermoplastic Polymers – Thermoplastics (TP)
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