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. - PowerPoint PPT Presentation

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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.

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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.


1
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. Feynman
2
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3
What are polymers? Why important ?
  • Long chain molecules
  • Extraordinary range of
  • physical properties
  • Many (not all) are cheap

4
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5
Because only 200 ethylene units in this chain
(200 - mer), molecular weight only 5,600 ( 28 x
200).
6
How 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!
7
Some Basic Chemistry Single and Double Bonds
8
Functional groups - small groups of atoms held
together in specific arrangement by covalent
bonds Responsible for principal chemical
properties of molecule
9
Some Basic Chemistry Condensation Reactions
Ethyl Alcohol or Ethanol
reversible reaction
CH3 - C - OH CH3 - CH2 - OH
CH3 - C - O - CH2 - CH3 H2O
Acetic Acid
10
Except, 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
12
Polyester
Reacting diacid dialcohol give polyester!
13
Nylons
14
I 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
15
I 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.
19
Assignment 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
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