Hydrophobic Polymers: High Temperature SEC
Calibration curves for GPC UT-800 sereis are shown.
Sample : PS, Polystyrene
Columns : Shodex GPC UT-800 series (8.0mmID*300mm each) Eluent : THF Flow rate : 1.0mL/min Detecto : Shodex RI Column temp. : Room temp.
Compared with GPC AT-806MS and GPC HT-800 series, GPC UT-800 series are free from share degradation.
Sample :
1. Polystyrene
2. HDPE-A, High density polyethylene
Columns : Shodex GPC UT-806M, HT-806M (8.0mmID*300mm each), AT-806MS (8.0mmID*250mm) Eluent : 0.1% BHT* in ODCB Flow rate : 1.0mL/min Detector : RI Column temp. : 140deg-C
*BHT: Butylhydroxytoluene
Shodex GPC UT-800 series are designed to prevent shear degradation. However, when the columns are used with a line filter, shear degradation may be caused by the line filter. In this case, shear degradation can be prevented by removing the line filter.
HDPE sample-A was analyzed using GPC UT-806M (a column for high temperature SEC). UT-806M is free from sharedegradation.
Sample : HDPE, High density polyethylene
Columns : Shodex GPC UT-806M (8.0mmID*300mm) x 2, Conventional type column x 2 Eluent : 0.1% BHT* in ODCB Flow rate : 1.0mL/min Detector : RI, MALS(Multi angle laser light scattering) Column temp. : 145deg-C
*BHT: Butylhydroxytoluene
HDPE sample-A was analyzed using GPC UT-800 series (columns for high temperature SEC).
Sample : HDPE, High density polyethylene
Columns : Shodex GPC UT-806M x 4, UT-807 + UT-806M x 2, UT-807 + UT-806M x 2 + UT-802.5 (8.0mmID*300mm each) Eluent : 0.1% BHT* in ODCB Flow rate : 1.0mL/min Detector : RI Column temp. : 140deg-C
*BHT: Butylhydroxytoluene
This shows a comparison of results for the analysis of high density polyethylene (HDPE) using conventional columns and GPC UT-806M. A high molecular weight portion of around 2×107 was detected with UT-806M.
Sample : HDPE, High density polyethylene
Columns : Shodex GPC UT-806M (8.0mmID*300mm) x 2, Conventional type column x 2 Eluent : 0.1% BHT* in ODCB Flow rate : 1.0mL/min Detector : RI, MALS(Multi angle laser light scattering) Column temp. : 145deg-C
*BHT: Butylhydroxytoluene
HDPE sample-B was analyzed using GPC HT-806M and UT-806M (columns for high temperature SEC).
Sample : HDPE, High density polyethylene
Columns : Shodex GPC UT-806M x 4, HT-806M x 2 (8.0mmID*300mm each) Eluent : 0.1% BHT* in ODCB Flow rate : 1.0mL/min Detector : RI Column temp. : 140deg-C
*BHT: Butylhydroxytoluene
Low density polyethylene (LDPE) is analyzed using GPC HT-806M and UT-806M columns. Mw values obtained from the calibration curve are almost the same. From the results, it can be concluded that a high molecular weight portion which is subject to shear degradation does not exist in the LDPE.
Sample : LDPE, Low density polyethylene
| Column | Particle Size |
Mw obtained from calibration curve (PS) |
|---|---|---|
| GPC UT-806M |
30micron
|
143,000 |
| GPC HT-806M |
13micron
|
133,000 |
Columns : Shodex GPC UT-806M x 4, HT-806M x 2 (8.0mmID*300mm each) Eluent : 0.1% BHT* in ODCB Flow rate : 1.0mL/min Detector : RI Column temp. : 140deg-C
*BHT: Butylhydroxytoluene