Chapter 14.4 - Molecular structure(I The physical...

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16 MSE 2090: Introduction to Materials Science Chapter 14, Polymer Structures Molecular structure (I) The physical characteristics of polymer material depend not only on molecular weight and shape, but also on molecular structure: 1 Linear polymers : Van der Waals bonding between chains. Examples: polyethylene, nylon. 2 Branched polymers : Chain packing efficiency is reduced compared to linear polymers - lower density
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17 MSE 2090: Introduction to Materials Science Chapter 14, Polymer Structures Molecular structure (II) 3 Cross-linked polymers : Chains are connected by covalent bonds. Often achieved by adding atoms or molecules that form covalent links between chains. Many rubbers have this structure. 4 Network polymers : 3D networks made from trifunctional mers. Examples: epoxies, phenol- formaldehyde
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18 MSE 2090: Introduction to Materials Science Chapter 14, Polymer Structures Isomerism Isomerism : Hydrocarbon compounds with same composition may have different atomic arrangements. Physical properties may depend on isomeric state (e.g. boiling temperature of normal butane is -0.5
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