Kinetics

Question 1

what is step-growth polymerization

Answer 1

aka condensation

R.U has less atoms than monomer; formation of byproducts

backbone contains f.g. heteroatoms

difuntional monomers

Question 2

what is chain growth polymerization

Answer 2

aka addition

same atoms in monomer as polymer

typically vinyl monomer

backbone all carbons

Question 3

step-growth kinetics

Answer 3

polymer MW increased in slow, step-wise manner

initially all monomers then slowly dimers, trimers, oligomers, then high polymer

Question 4

graph DP vs. Rxn time step growth

Answer 4

DP y-axis vs rxn time x-axis

T3 > T2 > T1 below Tc

T3 is top line has most polymerization

Question 5

do step growth polymers pack well?

Answer 5

yes, relatively strong attractions

strong polymers

Question 6

chain growth kinetics

Answer 6

requires initiation to begin growth (radical)

high polymer formed early but still monomers present

Question 7

graph DP vs rxn time chain growth

Answer 7

horizontal lines

T1 > T2 > T3

T3 at top but higher T = less DP b/c more termination at high T