polymerization and synthetics

1. Todays topic: from thightsto iPhones polymerization and synthetics

2. definitions: • Monomers (german: Monomere) - small and reactive molecules which can combine themselves to polymeres • Polymer (german: Polymer) - chemical combination consisting of many monomers combined to long chains - synthetic polymers are called synthetics • Polymerisation: (german: Polymerisation) - type of chemical reaction from monomers to a polymer

3. types of polymerizations and their monomeres two types of polymerization reactions: a) Polyaddition  needed monomers: molecules with double bond (alkenes) b) Polycondensation  needed monomers: molecules with functional groups ( caboxylic acids and alcohols)

4. polyaddition Alkenes can undergo polyadditions with themselves to form a long chain polymer molecule. They are called polyalkenes.

5. polyaddition

6. The polymer can be represented by showing the repeating unit with square brackets around it. The n stands for a unspecified number of monomer units. polyaddition

7. What´s condensation? polycondensation Chemical condesation: Combining of two functional groups  hydroxygroup of an alcohol and  carboxylgroup of a carboxylic acid of minimum two monomeres under elimination of water

8. polycondensation Example: Dihydroxaceton Bernsteinsäure

9. definitions and vocabulary • Monomers: • - small and reactive molecules which can combine themselves to so called polymeres • Polymer: • - chemical combination consisting of many monomers combined to long chains • - synthetic polymers are called synthetics • Polymerisation: • - type of chemical reaction from monomers to a polymer • Polyaddition: • - Monomers are alkenes, no elimination of molecules, radicals needed • Polycondensation: • Monomers are alcohols and caboxylic acids • elimination of water • functional groups needed

10. Which alkene?