Polymerisation Reactions
No description yet. This curated deck is ready for daily study.
Card preview (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