Chapter 14.2

Chapter 14.2 - Polymer molecules Polymer molecules can be...

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6 MSE 2090: Introduction to Materials Science Chapter 14, Polymer Structures Polymer molecules ¾ Polymer molecules can be very large ( macromolecules ) ¾ Most polymers consist of long and flexible chains with a string of C atoms as a backbone ¾ Side-bonding of C atoms to H atoms or radicals ¾ Double bonds are possible in both chain and side bonds ¾ Repeat unit in a polymer chain (“unit cell”) is a mer ¾ Small molecules from which polymer is synthesized is monomer . A single mer is sometimes also called a monomer. polyethylene (e.g. paraffin wax for candles) (mer)
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7 MSE 2090: Introduction to Materials Science Chapter 14, Polymer Structures Chemistry of polymer molecules (I) ¾ Ethylene (C 2 H 4 ) is a gas at room temp and pressure ¾ Ethylene transform to polyethylene (solid) by forming active mer through reaction with initiator or catalytic radical (R . ) ¾ ( . ) denotes unpaired electron (active site) 3. Termination when two active chain ends meet each other or active chain end meet with initiator or other species
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Chapter 14.2 - Polymer molecules Polymer molecules can be...

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