macromolecular chemistry - willson research group...
TRANSCRIPT
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Chemistry 367L/392N
Paul J Flory 1910Paul J Flory 1910--19851985
Macromolecular ChemistryMacromolecular Chemistry
Wallace H. Carothers 1896Wallace H. Carothers 1896--19371937
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Chemistry 367L/392N
Nomenclature MethodsNomenclature Methods� Source name (more common use)
– based on monomer name (polystyrene)
� IUPAC, constitutional repeating unit– used in both source and structure
names…messy!
� Abbreviations and acronyms– PMMA [poly(methyl methacrylate)]…also
common
� Trade names– marketing and technological literature
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Chemistry 367L/392N
ExamplesExamplesCH CH2
O C CH3
O
CH CH CH2 CH2
CH CH2
C N
CH2
OO
O
CH2
Ph
1. Poly(1-acetoxyethylene) - structure2. Poly(vinyl acetate) - source
1. Poly(but-1-ene-1,4-diyl)2. Polybutadienea
1. Poly(1-cyanoethylene)2. Polyacrylonitrile
1. Poly(methylene)2. Polyethene; polyethylene
1. Poly[(2,5-dioxotetrahydrofuran-3,4-diyl)(1-phenylethylene)]
2. Poly(maleic anhydride-alt-styrene)
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Chemistry 367L/392N
Industrial Influence: Trade Names Industrial Influence: Trade Names
� PVC poly (vinylidene chloride) Saran wrap� PVC poly (vinyl chloride) Pipe and records� PET poly (ethylene teraphthalate) Coke bottles, Dacron � Polystyrene Cups and packaging� Delrin Bushings and engineering parts� Lexan Bullet proof glass� Teflon Non stick pans� PVDF speakers and microphones� Kevlar bullet proof vests� Nylon Rope and fiber
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Chemistry 367L/392N
Common AbbreviationsCommon AbbreviationsSelected examples
ABS (acrylonitrile butadiene styrene)LLDPE (linear low density polyethylene)PA66 [polyamide (Nylon) 66]PC (polycarbonate)PET [poly(ethylene terephthalate)]PMMA [poly(methyl methacrylate)]PS (polystyrene)PVC [poly(vinyl chloride)]TP (thermoplastic elastomer polyolefin)PVF2 [poly(vinlylidine fluoride)]
(www.plasticsusa.com/tradename.html)
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Chemistry 367L/392N
Class NamesClass Names� Polyolefin
� Polyester
� Polyamide
� Polycarbonate
� Polyurethane
Naming Naming ““classesclasses”” of polymersof polymers
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Chemistry 367L/392N
Cl Br Cl BrBrCl
Poly(ethylene-alt-carbon monoxide)
Poly(1-oxopropanediyl)
CH2-O -CH-CCl-CH2-O-CH-CHCl-CH2-O-CH-CHCl
CH3 CH3 CH3
Poly(vinyl alcohol)
Poly(1-methyl-1-phenylethylene)
Name Name ‘‘emem or draw or draw ‘‘emem
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Chemistry 367L/392N
Wallace Hume Carothers 1896Wallace Hume Carothers 1896--19371937
Carothers, W.H., J. Am. Chem. Soc. 1929, 51, 2548-58
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Chemistry 367L/392N
Carothers PaperCarothers Paper
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Chemistry 367L/392N
Addition polymerAddition polymer
� Polystyrene
C CH
H
H C
H
C C C
H H
H H H
( )n
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Chemistry 367L/392N
Addition PolymerAddition Polymer� Polyvinylchloride
C C
H
H
Cl
H
chloroethene
C C C C
H H H H
H HCl Cl
poly(chloroethene) aka polyvinylchloride (pvc)
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Chemistry 367L/392N
Condensation PolymerCondensation Polymer� Dacron
HO C
O
C
O
OHn + HO CH2 CH2 OHn
heat with an acid catalyst
C
O
C
O
O CH2 CH2 O
poly(ethan-1,2-diyl benzene-1,4-dicarboxylate)
n
H2O +
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Chemistry 367L/392N
Condensation PolymerCondensation Polymer
N (CH2)6 NH
H
H
HC
O
OH(CH2)4
HO
OC
1,6-diaminohexane hexanedioic acid
N (CH2)6
H
N
H
C
O
(CH2)4 C
O
part of a nylon polymer chain
( )n
Nylon 6,6
H2O +
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Chemistry 367L/392N
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Chemistry 367L/392N
Carothers DefinitionCarothers Definition
A d d itio nCO2H
HO2CHO
OHO
OO
HO
O
H+
(
(
Condensation
- H2O
N C O
N C O
HOOH
OCNHN O
OO N
H
OAr
+
Condensation?
O
O O
O O
O
Condensation?
Addition?
Problems with Carothers DefinitionProblems with Carothers Definition
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Chemistry 367L/392N
Another ProblemAnother Problem
from ωωωω-hydroxycarboxylic acid
O R C
O
O C
O
R
OH R CO2H O R C
O
+ H2O
Polyester from lactone
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Chemistry 367L/392N
Paul J FloryPaul J Flory 19101910--19851985
The Nobel Prize in Chemistry 1974
"for his fundamental achievements, both theoretical and experimental, in the physical chemistry of the macromolecules"
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Chemistry 367L/392N
Flory Clears Things UpFlory Clears Things UpPolymer Structure is distinct from Polymerization Process.
O
O O
OH
HO
O
OH
HO
AdditionPolymerization
CondensationPolymerization
CondensationPolymer
� Release of small molecules
� Degradation gives different
composition
� New functional groupsCondensation
� Same composition
(monomer = polymer)
� Similar connections
� Ring-opening
� No by-products
Addition
StructureProcess
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Chemistry 367L/392N
Basic Types of Polymerization MechanismsBasic Types of Polymerization Mechanisms
Chain-growth
Step-growth
Ring-openingO
OO-
O
RO-O
ORO
H+
CH2CO
HO CH2 OH CH2CO
O CH2 O HH
H2O
DimerTetramerOctamerHexamer
...
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Chemistry 367L/392N
Chain growth systemChain growth system
The characteristic of a chain polymer is that The characteristic of a chain polymer is that polymer growth takes place by monomer reacting polymer growth takes place by monomer reacting only with the reactive centersonly with the reactive centers.. Monomer does not Monomer does not react with monomer and the differentreact with monomer and the different--sized species sized species such as such as dimerdimer, , trimertrimer, and , and nn--mermerdo not react with do not react with each other. The polymerization ceases when the each other. The polymerization ceases when the active center is destroyed by termination active center is destroyed by termination reaction(sreaction(s). ).
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Chemistry 367L/392N
A condensation takes place between two A condensation takes place between two polyfunctionalpolyfunctionalmolecules to produce one molecules to produce one larger polyfunctional molecule with the larger polyfunctional molecule with the possible elimination of a small molecule such possible elimination of a small molecule such as water. The reaction continues until one of as water. The reaction continues until one of the reagents is used up. the reagents is used up.
Step Growth systemStep Growth system
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Chemistry 367L/392N
The chain growth vs. step growthThe chain growth vs. step growth
Step Chain