CIE A Level Chemistry复习笔记7.7.3 Repeat Units & Monomers
Deducing the Repeat Unit of a Condensation Polymer
- In condensation polymerisation the monomers either contain 2 of the same functional group or one single monomer has both functional groups needed for polymerisation
- For example Diamine and dicarboxylic acid
- Or an aminocarboxylic acid
- When presented with 2 monomers there are steps to take in order to deduce the repeat unit of a condensation polymer
Exam Tip
- Remember: in condensation polymerisation, a small molecule is expelled as a result of the 2 monomers joining together.
- When a dioic acid and diamine polymerise, a water molecule is expelled
- OH from acid and H from the amine
- When a dioyl acid and diamine are polymerised, a hydrochloric acid molecule is expelled
- Cl from the dioyl acid and H from the amine
Identifying Monomers in Condensation Polymers
- When a section of polymer is presented, the monomers can be identified by considering the small molecules expelled from the monomers
- If a water molecule is expelled, the -OH must have been from an acid group
- The hydrogen atom may be from an amine group of a monomer.
- If the molecule was hydrochloric acid (HCl), a dioyl chloride monomer may have been used
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