The document discusses different types of polymers including thermoplastics, thermosets, and elastomers. It provides details on their molecular structures, properties, production methods, and common applications. Thermoplastics are solid but soften when heated, thermosets permanently harden when heated, and elastomers can stretch greatly and recover their original shape. Additives are used to modify polymer properties for different applications. The largest markets are thermoplastics like polyethylene and polypropylene for products and packaging.
22. Typical Values of DP and MW MW 300,000 100,000 15,000 40,000 DP( n ) 10,000 1,500 120 200 Polymer Polyethylene Polyvinylchloride Nylon Polycarbonate
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30. Low Density & High Density Polyethylene 135 C (275 F) 115 C (239 F) Melting temperature 700 MPa (100,000 lb/in 2 ) 140 MPa (20,000 lb/in 2 ) Modulus of elasticity 0.96 0.92 Specific gravity 92% 55% Degree of crystallinity High density Low density Polyethylene type
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