Chapter 14.5

Chapter 14.5 - Size Shape Structure classification MSE...

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21 MSE 2090: Introduction to Materials Science Chapter 14, Polymer Structures Size – Shape – Structure classification
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MSE 2090: Introduction to Materials Science Chapter 14, Polymer Structures Thermoplastic and thermosetting polymers Depending on the response to temperature increase, two types of polymers can be distinguished: (1) Thermoplastic polymers: soften and liquefy when heated, harden when cooled (reversible). Molecular structure: linear or branched polymers, with secondary bonding holding the molecules together. Easy to fabricate/reshape by application of heat and pressure Examples: polyethylene, polystyrene, poly(vinyl chlodide). (2) Thermosetting polymers: become permanently hard during their formation, do not soften upon heating. Molecular structure: network polymers with a large density of covalent crosslinks between molecular chains (typically, 10-50% of repeat units are crosslinked). Harder and stronger than thermoplastics, have better
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Chapter 14.5 - Size Shape Structure classification MSE...

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