29 - Polymerisation Flashcards
What are condensation reactions?
When two molecules react together and a small molecule (often H2O or HCl) is eliminated.
What are condensation polymers?
Polymers made from two different monomers, each of which has two functional groups. Both functional groups can react, forming long-chain polymers.
What is addition polymerisation?
When all the atoms in the monomer is used to form the polymer.
What is the ester link?
COO–
What is the amide link?
OC-NH
What are polyesters?
Polymers that have the ester linkage repeated over and over again.
What functional groups are used to make polyesters and what is eliminated?
Diols + dicarboxylic acids
H2O eliminated
What are the uses of polyesters?
Packaging and internal stiches.
Why are polyesters and polyamides biodegradable?
Ester and amide linkages are susceptible to hydrolysis.
And photo biodegradable as the C=O bond absorbs radiation.
What are polyamides?
Polymers that have the amide linkage repeated over and over again.
How are polyamides made?
diaminoalkanes (two amine groups on an alkane chain) + dicarboxylic acids.
What are the reagents for Nylon 6,6?
HOOC-(CH2)4 - COOH + H2N - (CH2)6 - NH2
What is the mechanism for the formation of nylon 6,6?
Addition-elimination.
What links are formed in nylon 6,6?
Amide links.
What are the reagents for Kevlar?
benzene-1,4-diamine + benzene-1,4-dicarboxylic acid.
