|
Rheological quantities
|
|
| Storage modulus |
G′
|
| Loss modulus |
G″
|
| Phase angle |
δ
|
| Complex viscosity function |
|η*|(ω)
|
| zero shear-rate viscosity |
η0
|
| Magnitude of the complex modulus |
|G*|
|
| Angular frequency |
ω
|
| Relaxation strength |
H
|
| Relaxation time |
τ
|
| Hencky strain rate |
|
| crossover frequency |
ωc (ω of G′=G″)
|
| temperature dependence according to Williams-Landel-Ferry’s law (based on free volume and not on potential barrier) |
WLF-temperature dependence
|
| shift factor |
aT
|
| Arrhenius activation energy |
Ea
|
| Activation energy spectrum determined from shifting δ(ω)
|
Ea(δ)
|
| Activation energy spectrum determined from shifting G’(ω)
|
Ea(G′)
|
| Activation energy spectrum determined from shifting G”(ω)
|
Ea(G″)
|
| Maximum activation energy, determined from Ea(δ)
|
Ea,max
|
| Phase angle at which Ea,max is found |
δmax
|
| Critical phase angle according to definition of Trinkle et al. [73] |
δc
|
| Slope of phase angle |
dδ/dlogω
|
| Material with an LCB-mPE-like thermorheologically complex behavior [62] |
LCB-mPE-like behavior (BL), BL-material |
| Material with an LDPE-like thermorheologically complex behavior [62] |
LDPE-like behavior (BH), BH-material |
| Material with a comb-PE-like thermorheologically complex behavior [62] |
comb-PE -like behavior (BC), BC-material |
|
Molecular quantities
|
|
| number-average molar mass |
Mn
|
| weight-average molar mass |
Mw
|
| z-average molar mass |
Mz
|
| Polydispersity index |
Mw/Mn
|
| molar mass distribution |
MMD
|
| long-chain branches |
LCBs
|
|
Material types
|
|
| long-chain branched metallocene catalyzed polyethylene |
LCB-mPE
|
| long-chain branched metallocene catalyzed high densitypolyethylene |
LCB-mHDPE
|
| long-chain branched metallocene catalyzed linear low densitypolyethylene |
LCB-mLLDPE
|
| low-density polyethylene |
LDPE
|
| linear low density Ziegler-Natta polyethylene |
ZN-LLDPE
|
| high density Ziegler-Natta polyethylene |
ZN-HDPE
|
|
Miscellaneous
|
|
| Logarithm (base 10) |
log
|
| Weight % |
wt.%
|