AMME1362 Chapter Notes - Chapter 14: Repeat Unit, Polymer, Natural Rubber

• School: University of Sydney
• Department: Aeronautical Engineering (Mechanical)
• Course: AMME1362
• Professor: Xiaozhou Liao

Document Summary

14. 2 hydrocarbon molecules: molecules that have double and triple covalent bonds are termed unsaturated. 14. 3 polymer molecules: macomolecules molecular gigantic in comparison to the hydrocarbon molecules above. Long structures are composed of structural entities called repeat units, which are successively repeated along the chain. The term monomer refers to the small molecule from which a polymer is synthesized. Where (cid:1876)(cid:3036) and (cid:1875)(cid:3036) is the fraction of the total number of chains and the weight fraction of molecules within the size ranges. corresponding size range. Chapter 14 polymer structures: degree of polymerization- is an alternate way of expressing average chain size of a polymer (dp) which represents the average number of repeat units in a chain: Where m is the repeat unit molecular weight: many polymer properties are affected by the length of the polymer chains (e. g. melting or softening temperature increases with increasing with molecular weight, at room temp.