Terms Flashcards
Another name for a polymeric molecule, huge molecule
Macromolecule
What is the smallest unit making up a polymeric molecule?
A Mer
The structure inside the parentheses is the styrene unit, the repeat unity of the polymer. The small subscript n means the molecule is repeated.
-(-CH2-ĆH-)n-
One Mer- one part of the many that make up a polymer; the chemical that is polymerized to make a polymer chain.
Monomers
Every unit is bonded on the other side with the same unit resulting in a chain of styrenes – ex. Styrene unit
Repeat unit
The chemical process of monomers reacting with each other to form a polymeric chain
Polymerization
The two or more monomers are distributed randomly with no particular pattern.
Random copolymer
The two or more monomers in this polymer are distributed in a perfectly repeating pattern
Perfectly alternating copolymer
A compound with far fewer monomer units in a chain than a polymer; it has a much lower molecular weight compared to a polymer
Oligomers
All monomers in the polymer chain are the same; if the monomer were styrene, the homopolymer would be named polystyrene.
Homopolymer
Describes every type of polymer except homopolymer; two or more different types of monomers make up the chain; three distinct distributions can take place.
Copolymer
Polymer molecules shaped like a star.
Star-shaped molecule
Polymer of three polymers; considered a copolymer.
Terpolymer
Polymerization of four polymers; considered a copolymer. Not the same as a quatermer which had four mers and is an oligomer
Quaterpolymer
Are not only dependent on a polymers chemical composition, but also structure of the polymer molecule
Properties of polymers
Polymer molecules that resemble trees because they possess a high number of branches
Highly branched
Long segments of one monomer are bonded to long segments of another monomer in a branch like structure
Graft copolymer
Long segments of one monomer are bonded to long segments of another monomer forming a long chain
Block copolymer
Every unit is bonded on the other side with the same unit resulting in a chain of styrenes - ex. Styrene unit
Repeat unit
Is the same as molar mass distribution; the larger this ratio, the greater the distribution of chain lengths in the sample. The polymer a on the graph on the polymer chemistry text page 16 had a narrow polydispersity while the polymer b on the same graph has a large polydispersity.
Polydispersity
One Mer- one part of the many that make up a polymer; the chemical that is polymerized to make a polymer chain
Monomer
Molar mass = DP x FM, ex. A polystyrene with a DP of 50 and FM of 104g/mil has a molar mass = 50 x 104g/mol = 5200g/mol.
Molar mass
The ratio Mw / Mn
Molar mass distribution
Another way of expressing polymer molar mass; Mw is always higher than Mn
Weight-average molar mass ( Mw )
The average molar mass of each polymer chain
Number-average molar mass ( Mn )
