MATS 3011 Lecture Notes - Molecular Mass
Document Summary
H2c=ch2; need radical initiator to initiate rxn to go to long chain one way to do it = free radical chemistry. This synthesis results w/ polymers w/ different chain length molecules. Hard to synthesize to control chain length and make them all the same length. Chemist and materials scientist can control the rxn by controlling the. Long chain molecules won"t most likely stay linear --> most likely to bunch up b/c entropy increases --> -> polymers consist of large # of molecular chains. Matsci page 2 n =~ 104 - 105 a =~ 0. 2-0. 7 nm say n = 105 and a = 0. 5. Let"s say the polymer molecule doesn"t coil up then length l = 105*0. 5 nm = 0. 5 microns (basically multiply n by length scale) -> 3 length scale a = 5 amstrongs, rg =~ 645 amstrongs, l = 50 microns (micrometers) on average, polymer molecules is coiled up about =~ l/rg times =~ (500000 amstrongs)/(645 amstrongs)
