Polymerisation Reactions Flashcards Preview

Chemistry 6 - Organic Chemistry > Polymerisation Reactions > Flashcards

Flashcards in Polymerisation Reactions Deck (16)

what kind of compounds can be polymerised

compounds with a C=C bond


what are polymerisation reactions essentially and why

- addition reactions
- because the alkene molecules add together in vast numbers to form the polymer


what general conditions do polymerisation reactions occur in

conditions of high temperature and pressure


what would you technically call an alkene molecule if it were to be used in a polymerisation reaction

a monomer


what is the standard way to write the name of a polymer

- to write poly at the beginning
- followed by the name of the monomer in brackets


what are the polymer names of ethene, propene, chloroethene, tetraflouroethene and phenylethene

- poly(ethene)
- poly(propene)
- poly(chloroethene)
- poly(tetraflouroethene)
- poly(phenylethene)


what are common names of the polymers of ethene, propene, chloroethene, tetraflouroethene and phenylethene

- polythene
- polypropene or polypropylene
- polyvinyl chloride or PVC
- PTFE or teflon
- polystyrene


why do formed polymers not have a fixed molecular formula

- because their molecular masses can be anything
- ranging from thousands to millions


what do we do instead to show the number of monomer molecules reacting anyway

- we use the letter n
- which is written behind the monomer


what do you use to show the repeat unit of the polymer

- you place the repeating units into brackets
- square or curved


what do you write after the repeating unit of the polymer in the bracket

the letter n as a subscript


what detail needs to be met when drawing the repeating unit of the polymer inside brackets

- the covelant bonds on the carbon atoms needs to be shown passing through the brackets
- this indicates that there is another repeating unit joined to the molecule


if you are given a polymer with several repeating units shown, how would you identify the monomer it is made from

- look for a pair or carbon atoms next to each other
- and the four atoms or groups of atoms joined to them
- the monomer structure is then all of these atoms
- but with a double bond between the carbon atoms


when you draw the monomer, do you draw it in brackets and write the subscript n and why

- no you dont
- because this is only showing part of the structure
- and not just the repeating unit


what is the difference between how you draw the atoms or groups of atoms bonded to the two main carbon atoms when its a monomer and the repeating unit of a polymer

- for the monomers with double bonds you draw the molecules with angles of 120 degrees between the bonds
- but with the repeating unit of the polymer you draw the bonds at 90 degrees


what is the definition of a monomer

small molecules that combine together to form a polymer