Intro to Polymers PT 3

Question 1

What is the definition of molecular shape or conformation?

Answer 1

Chain bending and twisting are possible by rotation of carbon atoms around their chain bonds

Question 2

What does monomer orientation dictate with polymer configurations?

Answer 2

1. Stereoisomerism
2. Tacticity
3. Monomer composition (co-polymer)

Question 3

What does monomer orientation lead to the measurement of?

Answer 3

Chain end-to-end distance R

Question 4

What is stereoisomerism?

Answer 4

Mirror images that cannot superimpose without breaking a bond

Question 5

What is tacticity?

Answer 5

stereoregularity or spatial arrangement of R units along chain

Question 6

What is isotactic?

Answer 6

All R groups on the same side of chain

Question 7

What is syndiotactic

Answer 7

R groups alternate sides

Question 8

What is atactic?

Answer 8

R groups randomly positioned

Question 9

What is cis isomerism?

Answer 9

H and CH3 groups on same side of chain

Question 10

What is trans isomerism?

Answer 10

H and CH3 group on opposite sides of chain

Question 11

What is a copolymer?

Answer 11

two or more monomers polymerized together

Question 12

What is a random copolymer?

Answer 12

A and B randomly positioned along chain

Question 13

What is an alternating copolymer?

Answer 13

A and B alternate in polymer chain

Question 14

What is a block copolymer?

Answer 14

large blocks of A units alternate with large blocks of B units

Question 15

What is a graft copolymer?

Answer 15

Chains of B units grafted onto A backbone