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monomer
a small molecule.
polymer
long-chain molecule made up of repeated pattern of monomers
types of polymerization
Condensation, chain addition, and cross link
condensation polymerization
two monomers react to form a larger unit while a small molecule (water or HCl) is eliminated
chain addition
- involves a vinyl-type monomer
- products of it have simple hydrocarbon backbones
- empirical formula of product is identical to its monomer
initiation
an initiator forms a reactive species(radicals)
propagation
radicals react with monomer to begin chain addition process
stages of chain addition
Initiation, propagation, and termination
termination
When two individual chains react together in which no new radical is made
monomers and initiator amounts
- Increasing amount of monomers = longer chains - Increasing amount of initiator = more, but shorter chains
Homopolymer
has the same monomer unit making up the polymer chain
block copolymer
has two different monomer units that alternation and make up the polymer chain
lactones
undergo transesterification polymerization
annealing
melts the polymer and removes excess solvent
repeat units (n)
(mol monomer)/(mol initiator)
theoretical molecular mass (Mn)
(MW initiator) +(n*MW monomer)
end groups of the homopolymers
Act as initiators for the polymerization of a second monomer
thermoplastics
can be molded by heating about the melting temp. of the hard poly(L-lactide blocks)
