4.

find)

Using the data in the table below (where r is the reactivity ratios of some monomers,

(15-points)

i. Which of these (if any)

will generate an alternating

copolymer

ii.

Which of these (if any)

will generate a random

copolymer.

Which of these (if any)

will generate a block

copolymer.

Monomer 1

Acrylonitrile

1,3-Butadiene

Monomer 2

Styrene

Vinyl acetate

1,3-Butadiene

Methyl methacrylate

Styrene

Vinyl acetate

Vinyl chloride

Methyl methacrylate

Styrene

Vinyl chloride

Methyl methacrylate Styrene

Vinyl acetate

Vinyl chloride

Vinyl acetate

Vinyl chloride

Vinyl chloride

"₁

12

0.02

0.30

0.15 1.22

0.04 0.40

4.2 0.05

2.7 0.04

0.75

0.25

1.35 0.58

8.8 0.035

0.46

0.52

20

0.015

10 0.1

55 0.01

17 0.02

0.23

1.68

T (°C)

40

80

60

50

60

90

50

50

60

60

68

60

60

60