CHEMISTRY OF POLYMER
MOLECULES
,What molecular chemistry explains
Chemical identity
The atoms and bonds in a chain define the groups
that can interact, react, and move. The word polymer,
by itself, does not describe a single type of behavior.
Molecular organization
Chain length, branching, sequence, and
stereochemistry expand structural diversity. Materials
with similar units can have different organization and
properties.
Relationship to material behavior
Analysis connects molecular structure, chain
organization, and macroscopic response. Processing,
additives, and service conditions must also be
considered. From chemical bonding to material behavior.
,Monomer, macromolecule, and polymer
Distinguishing an individual molecule from the material prevents confusion among reactants, chain segments,
and collections of molecules.
Concept Meaning Example or distinction
Molecule capable of
Monomer Ethene, before incorporation into polyethylene.
participating in polymerization.
Residue of a monomer
Monomeric unit It is not a free monomer molecule.
incorporated into the chain.
Molecule of high molecular
Macromolecule An individual chain or a covalent network.
mass.
Substance composed of
Polymer A sample may contain chains of different sizes.
macromolecules.
Oligomers contain only a few units; no universal numerical cutoff separates oligomers and polymers in every
system.
, How to read a repeating unit
Monomer transformation
In vinyl monomers, the double bond is consumed
during chain growth. Side groups remain attached to
the carbon backbone.
Meaning of the brackets
The brackets delimit a repeating segment. Bonds
cross their boundaries to indicate continuity; n
denotes the number of repeats in this notation.
What is not shown
The formula omits end groups, size distribution, and
conformation. It does not describe the entire sample.
In the figures, R denotes a generic fragment.
Vinyl monomers and representations of their chains.
MOLECULES
,What molecular chemistry explains
Chemical identity
The atoms and bonds in a chain define the groups
that can interact, react, and move. The word polymer,
by itself, does not describe a single type of behavior.
Molecular organization
Chain length, branching, sequence, and
stereochemistry expand structural diversity. Materials
with similar units can have different organization and
properties.
Relationship to material behavior
Analysis connects molecular structure, chain
organization, and macroscopic response. Processing,
additives, and service conditions must also be
considered. From chemical bonding to material behavior.
,Monomer, macromolecule, and polymer
Distinguishing an individual molecule from the material prevents confusion among reactants, chain segments,
and collections of molecules.
Concept Meaning Example or distinction
Molecule capable of
Monomer Ethene, before incorporation into polyethylene.
participating in polymerization.
Residue of a monomer
Monomeric unit It is not a free monomer molecule.
incorporated into the chain.
Molecule of high molecular
Macromolecule An individual chain or a covalent network.
mass.
Substance composed of
Polymer A sample may contain chains of different sizes.
macromolecules.
Oligomers contain only a few units; no universal numerical cutoff separates oligomers and polymers in every
system.
, How to read a repeating unit
Monomer transformation
In vinyl monomers, the double bond is consumed
during chain growth. Side groups remain attached to
the carbon backbone.
Meaning of the brackets
The brackets delimit a repeating segment. Bonds
cross their boundaries to indicate continuity; n
denotes the number of repeats in this notation.
What is not shown
The formula omits end groups, size distribution, and
conformation. It does not describe the entire sample.
In the figures, R denotes a generic fragment.
Vinyl monomers and representations of their chains.
