ester and amide links
What ester and amide links means in Chemistry A-Level, as defined for AQA, OCR.
Definitions of ester and amide links
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Reference: OCR
A polyester repeat unit contains one residue of each monomer joined by two ester groups, while a polyamide repeat unit has –CONH– amide links.
A diol and a dicarboxylic acid give an ester link, -COO-, while a diamine and a dicarboxylic acid give an amide link, -CONH-.
Topics that use ester and amide links
- Condensation polymers (A-level only) (AQA A-Level)
- Polyesters and polyamides (OCR A-Level)
Related terms
- Condensation polymerisation
- difunctional monomers
- hydrogen bonding between chains
- Acid hydrolysis of esters
- Addition polymerisation
- Amide group formation
- Amide linkage
- amino acid self-condensation
Using ester and amide links in the exam
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