Preferred Label : expansion factor;
Detailed label : expansion factor in polymers;
IUPAC definition : The ratio of a dimensional characteristic of a macromolecule in a given solvent at
a given temperature to the same dimensional characteristic in the θ state at the same
temperature. The most frequently used expansion factors are: expansion factor of the
mean-square end-to-end distance, αr sqrt( r2 / r2 o); expansion factor of the radius
of gyration αs sqrt( s2 / s2 o); viscosity expansion factor αη ([η]/[η]θ)1/3 where
[η] and [η]θ are the intrinsic viscosity in a given solvent and in the θ state at
the same temperature, respectively. Expansion factors defined by different dimensional
characteristics are not exactly equal, nor need they have a constant ratio as a function
of relative molecular mass.;
Origin ID : E02270;
See also
The ratio of a dimensional characteristic of a macromolecule in a given solvent at
a given temperature to the same dimensional characteristic in the θ state at the same
temperature. The most frequently used expansion factors are: expansion factor of the
mean-square end-to-end distance, αr sqrt( r2 / r2 o); expansion factor of the radius
of gyration αs sqrt( s2 / s2 o); viscosity expansion factor αη ([η]/[η]θ)1/3 where
[η] and [η]θ are the intrinsic viscosity in a given solvent and in the θ state at
the same temperature, respectively. Expansion factors defined by different dimensional
characteristics are not exactly equal, nor need they have a constant ratio as a function
of relative molecular mass.
