Chemistry Reference
In-Depth Information
[
η
]
θ
intrinsic viscosity under theta conditions
η
complex viscosity
η
0
η
dynamic viscosity
“real” part of
5
η
ηv
“imaginary” part of
η
r
relative viscosity (unitless)
η
sp
specific viscosity (unitless)
inherent viscosity [units of (concentration)
2
1
]
η
inh
θ
(theta) angle
θ
mean residence time in a continuous reactor
θ
fraction of active Ziegler
Natta catalyst sites
θ
M
fraction of active sites occupied by monomer in Ziegler
Natta poly-
merization
κ
(kappa) Boltzmann constant
R/L
5
λ
(lambda) wavelength of light
λ
proportionality constant in relation between polymer molecular weight
and hydrodynamic volume
λ
stretched length of rubber specimen
λ
0
unstretched length of rubber specimen
μ
(mu) chemical potential
μ
number of moles of monomer reacted per mole of initiator in ionic
polymerizations (Chapter 9)
10
2
6
m
μ
micron
5
μ
consistency
μ
constant in Eqs. (3-98) and (3-99)
ν
(nu) kinetic chain length
ν
frequency (cycles/sec)
ξ
(xi) function of comonomer concentration
π
(pi) osmotic pressure
ρ
(rho) density
ρ
a
density of amorphous polymer
ρ
c
density of perfectly crystalline polymer
ρ
0
fraction of reactive groups in a copolymerization which are part of a
multifunctional cross-linking agent
σ
(sigma) number of chain elements in a macromolecule
σ
tensile stress
σ
function defined in Eq. (5-32)
σ
h
hoop stress
σ
0
stress amplitude
σ
y
yield stress
τ
(tau) turbidity
τ
shear stress
τ
time
φ
(phi) volume fraction
φ
c
volume fraction of polymer in the crystalline state
