Thinking skills – Try to use key scientific words where possible.

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Presentation transcript:

Thinking skills – Try to use key scientific words where possible. Stage 1: This picture definitely shows me… Stage 2: I think this picture shows me… Complete on Post Its and stick on the board! Stage 4: The questions I need to ask about this picture are… Stage 3: This picture does not show me…

Polyesters Thursday, 10 January 2019

Polyesters Lesson objective: To know how we make polyesters Success criteria: Identify the monomer(s) required to form a given section of a polymer and vice versa Describe condensation polymerisation Compare addition and condensation polymerisation Explain how polyesters are formed during condensation polymerisation

Rearrange the words to define ‘Condensation’ which two small such as water molecules react is a reaction in a larger molecule, of a small molecule with the elimination together to form Is a reaction in which two small molecules react together to form a larger molecule, with the elimination of a small molecule such as water.

Condensation Polymerisation Definition The formation of a polymer, usually by the reaction of two different monomers, and in which a small molecule is also formed.

Polyesters In general polyesters are made from: A diol (a compound with two hydroxyl groups) A dicarboxylic acid (a compound with two carboxyl groups) or a dioyl dichloride (a compound with two acyl chloride groups)

Condensation Polymerisation Making polyethylene terephthalate, PET a polyester The diol monomer is: The other monomer is: Two carboxyl groups Two hydroxyl groups PET

Condensation Polymerisation A hydroxyl group on the diol can react with a carboxyl group on the dicarboxylic acid. Reaction Note the ester linkage Note the water molecule formed The product has a hydroxyl group and a carboxyl group. Further reactions can happen, leading to a long polymer molecule. Pg 127 Pearsons, pg 83 cgp, 190-191 text book

Monomers: Ethane-1,2-diol Benzene-1,4-dicarboxylic acid Repeat unit: n Ester linkage

Polyesters Lesson objective: To know how we make polyesters Success criteria: Identify the monomer(s) required to form a given section of a polymer and vice versa Describe condensation polymerisation Compare addition and condensation polymerisation Explain how polyesters are formed during condensation polymerisation

Polymerisation Compare addition and condensation polymerisation Polymerisation Compare addition and condensation polymerisation. What are the similarities and differences?

Addition Polymerisation Condensation Polymerisation Examples such as poly(ethene) Monomers are unsaturated organic compounds, e.g. alkenes The polymer formed is the only product Condensation Polymerisation Monomers are organic compounds with at least two reactive groups (such as hydroxyl, carboxyl or amine groups) The polymer is not the only product formed (a smaller product such as H2O or HCl forms too)

Polyesters Lesson objective: To know how we make polyesters Success criteria: Identify the monomer(s) required to form a given section of a polymer and vice versa Describe condensation polymerisation Compare addition and condensation polymerisation Explain how polyesters are formed during condensation polymerisation

Questions Page 127 pearsons, worked example and look example with dioyl dichloride, Now try this. Pg 127 workbook

Questions 1 – methyl methanoate is an ester Questions 1 – methyl methanoate is an ester. a) Draw the structure of this ester CGP page 83

Questions 1 – methyl methanoate is an ester Questions 1 – methyl methanoate is an ester. b) Write an equation to show the formation of this ester from a suitable acid and an alcohol CGP page 83

Questions 1 – methyl methanoate is an ester Questions 1 – methyl methanoate is an ester. c) Name the type of reaction that is taking place to form this ester. CGP page 83

Polyesters Lesson objective: To know how we make polyesters Success criteria: Identify the monomer(s) required to form a given section of a polymer and vice versa Describe condensation polymerisation Compare addition and condensation polymerisation Explain how polyesters are formed during condensation polymerisation