Title: It is wonderful if you can find something you love to do in your youth which is big enough to sustain your interest through all your adult life. Because, whatever it is, if you do it well enough people will pay you to do what you want to do anyway.
1It is wonderful if you can find something you
love to do in your youth which is big enough to
sustain your interest through all your adult
life. Because, whatever it is, if you do it well
enough people will pay you to do what you want to
do anyway. Feynman
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3What are polymers? Why important ?
- Long chain molecules
- Extraordinary range of
- physical properties
- Many (not all) are cheap
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5Because only 200 ethylene units in this chain
(200 - mer), molecular weight only 5,600 ( 28 x
200).
6How big is n ?
Commercially produced polyethylenes often have
MWs of hundreds of thousands. If ethylene unit is
1" instead of a few angstroms Length of fully
stretched out MW 420,000 chain is almost 1/4
mile!
7Some Basic Chemistry Single and Double Bonds
8Functional groups - small groups of atoms held
together in specific arrangement by covalent
bonds Responsible for principal chemical
properties of molecule
9Some Basic Chemistry Condensation Reactions
Ethyl Alcohol or Ethanol
reversible reaction
CH3 - C - OH CH3 - CH2 - OH
CH3 - C - O - CH2 - CH3 H2O
Acetic Acid
10Except, reaction goes step-wise
11 Monomers
HO - C - (CH2)n - C - OH HO - (CH2)m - OH
HO - C - (CH2)n - C - O - (CH2)m - OH H2O
Dimer
12Polyester
Reacting diacid dialcohol give polyester!
13Nylons
14I am making the announcement of a brand new
chemical textile fiber ---derivable from coal,
air and water -- and characterized by extreme
toughness and strength -- Charles Stine V.P.
for research, Du Pont, 1938
15I am making the announcement of a brand new
chemical textile fiber ---derivable from coal,
air and water -- and characterized by extreme
toughness and strength -- Charles Stine V.P.
for research, Du Pont, 1938
16 May 15 1940 - Nylon Day Four million pairs go
on sale throughout US Supply exhausted in 4 days.
17 Nylon Parachute WWII
18 Post WWII stocking sale, San Francisco.
19Assignment Review today's classnotes a. what
is a polymer? b. molecular weight c. chemical
bonding d. functional groups e.
polymerization f. polyesters g. nylons Read
chapter 14