Styrene is polymerized by free radical mechanism in solution.
The initial monomer and initiator concentrations are 1 M and 0.001
M, respectively. At the polymerization temperature of 60ÂșC, the
initiator efficiency is 0.30. The rate constants at the
polymerization temperature are as follows:
kd= 1.2 x 10-5 s-1
kp= 176 M-1s-1
kt= 7.2 107m-1s-1
Given this information, determine the following;
a. Rate of initiation at 1 min and at 16.6 hrs
b. Steady-state free radical concentration at 1 min
c....
With the aid of diagrams describe the radical polymerization of
vinyl acetate using AIBN as initiator. Describe initiator
formation, monomer initiation, and propagation steps. In addition,
describe the various mechanisms by which chain termination (no
capacity for further growth) can occur.
Describe the various ways in which charge transfer could occur
(potential for further growth) for the polymerization described in
part (b) above.
Show mechanism for 2 methylpropane free radical monobromination.
Explain why pryon undergoes substitute reaction like benzene
but not addition reaction at the C=C bond
The living character of living radical polymerization is limited
under certain conditions, such as high monomer conversion, high
initiator concentration, and high targeted molecular weight
(>100,000). Explain why these conditions result in broadening of
PDI and some difficulty in producing block copolymers with
well-defined block lengths of different monomers.
What is the difference between incremental innovation and
radical innovation? Offer one example of a radical innovation.
Explain why your specific example illustrates radical
innovation.
What differences are there between a free living, single celled
organism such as a paramecium and a single human cell such as a
ciliated cell of the respiratory tract?
Describe why termination in radical polymerization by
disproportionation and combination result in different
polydispersities. Which results in a higher PDI?