Chain Growth Polymerization : Radical Polymerization: using Equal reactivity Hypothesis

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Chain Growth Polymerization Radical
Polymerization using Equal reactivity Hypothesis
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Radical polymerization average Mol. Wt.
Kinetic Chain Length, n Average number of
monomer molecule reacting with a polymer chain
radical during its entire life time
With increasing I2 n decreases
Average Molecular weight of dead chain
when termination is by combination only when
termination is by disproportionation only when
there is mixed termination
With increasing S, n decreases
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Radical polymerization Verification of kinetic
model
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Ionic polymerizationCationic Polymerization
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Anionic polymerization
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Stereoregular polymerization
Ziegler Natta Catalyst 1.Generally halides of
Group IV to VIII called catalyst such as TiCl3,
TiCl2, VCl3etc.. 2. Compounds (alkyls or aryls)
of elements of group I to Group IV called co
catalyst such as Al(C2H5)3,, Al(C2H5)Cl2
TiCl4Al(C2H5)2 Cl
TiCl3(C2H5) Cl Al C2H5 Cl
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Stereoregular polymerization
Cl3Ti-C2H5 CH2CHR
Cl3Ti-C2H5CH2CHR
Iso-tactic
Cl3Ti C2H5 CH2 CHR
syndiotactic
Cl3Ti-CH2CHRC2H5