Chemistry Reference
In-Depth Information
Δ
E
energy difference between
trans
and skew conformations
Δ
H
activation energy
Δ
H
f
latent heat of freezing
Δ
H
m
enthalpy change on melting
Δ
H
v
latent heat of vaporization
Δ
G
m
Gibbs free energy change in melting process
Δ
S
m
entropy change on melting
ΔA
difference between energy minima in
trans
and
gauche
staggered
conformations
ΔΩ
bridge imbalance in vapor phase osmometer
Δ
(superscript) exponent in relation between hydrodynamic volume and
polymer molecular weight
Λ
extension ratio
L
product of
P
sum of
Φ
calibration factor
Ω
(omega) drainage factor (unitless)
α
(alpha) excess polarizability
α
expansion coefficient
α
function of comonomer concentrations
α
deformation angle in shear
α
degree of dissociation of ion pairs in cationic polymerization
α
3
measure of skewness of molecular weight distribution
α
η
ratio between intrinsic viscosities
β
(beta) Poisson's ratio
γ
shear strain
γ
surface energy
γ
shear rate
velocity gradient
d
γ
/dt
5
5
γ
a
strain amplitude
γ
shear rate (units are time
2
1
)
γ
interfacial tension
δ
(delta) loss angle
δ
solubility parameter
A
(epsilon) energy
A
number of additional cross-links in a molecule which already contains
one cross-link
A
nominal tensile strain
ζ
(zeta) relaxation time, retardation time
η
(eta) coefficient of viscosity
η
viscosity of polymer solution
η
function of comonomer concentrations and reactivity ratios
η
a
apparent viscosity
η
0
viscosity of solvent
[
η
]
intrinsic viscosity, limiting viscosity number
