Unterschiede

Hier werden die Unterschiede zwischen zwei Versionen angezeigt.

--- en:materialdaten:molekulargewicht [2024/07/16 16:17] – neelest
+++ en:materialdaten:molekulargewicht [2025/05/20 11:22] (aktuell) – cschall
@@ Zeile 1: / Zeile 1: @@
 ======Molecular weight======
-FIXME
+===== Material data - Molecular weight =====
-===== Molecular weight =====
+The material data on molecular weight are optional entries.
-The molecular mass distribution can be characterised by the following quantities.
+The MFI and MVI (with given test temperature and weight) are only used to complete the material data for information purposes and are not required for any calculation.
-The **numerical average $M_n$** is given by the following equation:
+The parameters for the material degradation calculation can be activated as required. \\
+If the checkbox is activated, the 5 material parameters $K_T$, $n_T$, $K_\dot{\gamma}$, $n_\dot{\gamma}$ and $\eta_\infty$ can be entered. These are required for the [[en:berechnungen:materialabbau|calculation of molecular degradation]].
-\[M_n = \frac{\sum N_i \cdot M_i}{\sum N_i}\]
+{{ :materialdaten:rex171_mat_en_008.png?nolink |}}
-$N_i$ is the number of molecules of group $i$ and $M_i$ is the molar mass of the respective
+===== Exemplary values =====
-group.
-The **weight average $M_w$** is defined by:
+^ Plastic type^ MFR (g/10 min) ^ $K_T [°C] $   ^ $n_T [-] $ ^ $K_\dot{\gamma} [1/s] $ ^ $n_\dot{\gamma} [-]$ ^$\eta_\infty^* [-]$ ^
+| PP | 3,0   | 345,7 | 15,29 | 1171,4 | 1,47 | 0,415 |
+| PP | 3,0   | 355,3 | 13,75 | 882,3   | 1,62 | 0,417 |
+| PP | 47,0 |1617,0| 3,15   | 6989,3 | 0,85 | 0,531 |
+| PP | 8,0   | 344,8 | 15,41 | 1861,1 | 1,15 | 0,386 |
+| PS | 1,5   |17326 | 1,22   | 5749,3 | 0,81 | 0,306 |
+| PS | 12,0 | 761,5 | 40,36 | 8740,6 | 0,63 | 0,361 |
-\[M_w = \frac{\sum N_i \cdot {M_i} ^2}{\sum N_i \cdot M_i}\]
-The **polydispersity (PD)** is a measure of the width of molecular weight distribution and
-it´s the quotient of weight average and number avergage.
-\[PD = \frac {M_w}{M_n}\]
-The polydipersity is always PD ≥ 1. The higher the PD value, the broader the distribution.
-The measurement of the **solvent viscosity** or **intrinsic viscosity**
-indirectly indicates a change in the molecular mass, as the flow time of a damaged polymer is
-of a damaged polymer compared to the raw material. The
-intrinsic viscosity is linked to the molecular mass via the Mark-Houwink relationship:
-\[[η] = K \cdot \bar{M^a}\]
-$[η]$ = Staudinger index
-$K, a$ = empirically determined constants
-$ \bar{M}$ = weight average or viscosity average of the molecular mass
-The determination of $[η]$ instead of extrapolating to the concentration c = 0 $\frac{g}{l}$ by measuring the intrinsic viscosity at only one concentration using an estimate. The estimation according to Schulze-Blaschke is carried out by a prior calibration of the $K_{SB}$ coefficient, which is not necessary for the calculation according to Billmeyer.
-The **viscosity number (VZ)** [$\frac{cm^3}{g}$] is characterised by:
-$$ VZ = (\frac {η}{η_s} - 1) \cdot \frac {1}{c} $$
-$η$ =  dynamic viscosity of the solution
-$η_s$ = dynamic viscosity of pure solvent
-$c$ = concentration in $\frac{g}{cm^3}$
-The Billmeyers **intrinsic viscosity** [$\frac{dl}{g}$] is calculated by:
-$$ IV = 0,25 \cdot VZ + \frac{3\cdot ln(\frac{t}{t_s})} {4\cdot c} $$
-$t$ = flow time of the solution
-$t_s$ = flow time of the pure solvent
+===Further topics===
+  * [[en:materialdaten:datenbankanbindung_an_pam|]]
+  * [[en:materialdaten:allgemeineangaben|]]
+  * [[en:materialdaten:thermodynamische_daten|]]
+  * [[en:materialdaten:dichtedaten_bzw._spezifisches_volumen|]]
+  * [[en:materialdaten:rheologische_materialdaten|]]
+  * [[en:materialdaten:technologische_daten|]]
+  * [[en:materialdaten:tribologische_daten|]]
+  * [[en:materialdaten:zusatzstoffe|]]
+  * [[en:materialdaten:molekulargewicht|]]
+  * [[en:materialdaten:faserabbau|]]
+  * [[en:materialdaten:eingabe_von_mischungen|]]