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BIEN 140B > Polymerization > Flashcards

Flashcards in Polymerization Deck (16)
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1

What is polymerization?

A reaction or set of reactions in which simple molecules react with one another to form a macromolecules

2

What are polymerization strategies?

number of monomer species
chemical reaction
kinetics
physical arrangement of set up

3

What is ethylene addition?

C=C reacts with another C=C

4

What is esterification?

acid reacts with glycol

5

What is amidation?

acid reacts with an amine

6

What is acetylation?

reaction with acetic acid

7

What is step condensation/polycondensation?

small reactive bifunctional molecule reacts with another one to increase the weight of the molecule with respect to time.

8

What is chain polymerization/polyaddition?

C=C reacts with each other to form two single bonds and propagate the chain

9

What is ring opening?

Monomer is a cyclic molecules which upon reacts with other cyclic monomers

10

What is a homogenous arrangement?

liquid reaction medium is clear/transparent
includes bulk and solution polymerization

11

What is a heterogenous arrangement?

liquid medium is cloudy due to the presence of a second dispersed phase
includes suspension and emulsion polymerization

12

What are the characteristics of step condensation?

Successive reaction
two reagents react with one another
MW increases with time
initiators are not necessary to start the process

13

What are the influencing factors of step condensation?

reaction time
reaction temp
exothermic process
catalysts are used
non-equimolar addition of reagents

14

What are termination strategies of step condensation?

non-equimolar addition of reagents
addition of mono functional reagent
reduction of temperature

15

What is chain polymerization?

consists of forming a complete polymer chain by destabilizing the C=C bond of a monomer and reacting it with another double bond (C=O or C=N)
reaction takes place via addition of an initiator which causes the formation of an active center
active center is then transferred from one monomer to another

16

What are the types of chain polymerization?

free radical
cationic
anionic