Chemistry Reference
In-Depth Information
M
symbol for a monomer unit
Me
CH
3
a
M
0
formula weight for repeating unit in a polymer
M
n
number average molecular weight
M
v
viscosity average molecular weight
M
w
weight average molecular weight
M
z
average molecular weight
M
z
1
i
z
i
average molecular weight
1
N
number of polymer molecules (or moles) per unit volume
N
number of light scatterers per volume
V
N
newton (SI unit)
N
number of latex particles per unit volume of aqueous phase in emulsion
polymerization
N
Deb
Deborah number (dimensionless)
N
i
number average length of sequences of monomer
i
in a copolymer
n
total number of chains
n
i
number of chains having I repeating units
P
pressure
N/m
2
)
Pa
Pascal, SI unit of pressure or stress (
5
P
1
vapor pressure of pure solvent at given temperature
P
0
magnitude of a colligative property of a polymer solution
Pv
intensity of light scattered from a polymer solution
P
i
general reactivity factor for radical ending in monomer M
i
P
y
probability of occurrence of a molecule containing
y
monomers
P
ij
probability that monomer
j
follows monomer
i
in a copolymer)
Q
volumetric flow rate
Q
volume of fluid flow in time
t
Q
symbol for inhibitor or retarder molecule
Q
i
general reactivity factor for monomer M
i
R
alkyl group
R
universal gas constant
R
symbol for rate of a reaction
R
function of reactivity ratios
R
ratio of volumes of solvent-rich and polymer-rich phases in fractionation
R
i
rate of initiation
R
M
rate of formation of monomer-ended radicals
R
p
rate of propagation
R
t
rate of termination
R
tc
rate of termination by combination
R
td
rate of termination by disproportionation
R
θ
reduced scattering intensity
R
90
Rayleigh ratio
R
(
t
)
decay function of residence times in a continuous reactor
S
entropy
