PMID- 17442326
OWN - NLM
STAT- MEDLINE
DCOM- 20070906
LR  - 20090115
IS  - 0021-9673 (Print)
IS  - 0021-9673 (Linking)
VI  - 1154
IP  - 1-2
DP  - 2007 Jun 22
TI  - Characterization of high molecular weight polyethylenes using high temperature 
      asymmetrical flow field-flow fractionation with on-line infrared, light 
      scattering, and viscometry detection.
PG  - 319-30
AB  - High temperature asymmetrical flow field-flow fractionation (HTAF4) coupled to 
      infrared (IR), multi-angle light scattering (MALS), and viscometry (Visc) 
      detection is introduced as a tool for the characterization of high molecular 
      weight polyethylenes. The high molecular weight fraction strongly affects the 
      rheological behaviour and processability of polyethylene materials and can often 
      not be accurately resolved by current technology such as high temperature 
      size-exclusion chromatography (HTSEC). Molecular weight (M), radius of gyration 
      (Rg), and intrinsic viscosity [eta] of linear high density polyethylene (HDPE) 
      and branched low density polyethylene (LDPE) samples are studied in detail by 
      HTAF4 and are compared to HTSEC. HTAF4 showed a better separation and mass 
      recovery than HTSEC for very high molecular weight fractions in HDPE and LDPE 
      samples. As no stationary phase is present in an HTAF4 channel, the technique 
      does not show the typical drawbacks associated with HTSEC analysis of high 
      molecular weight polyethylenes, such as, exclusion effects, shear degradation, 
      and anomalous late elution of highly branched material. HTAF4 is applied to study 
      the relation between the molecular weight and the zero shear viscosity eta0 for 
      high molecular weight HDPE. It was found that the zero shear viscosity values 
      predicted from HTAF4 results are in good qualitative agreement with measured 
      values obtained from dynamic mechanical spectroscopy (DMS) experiments, whereas 
      eta0 values predicted from HTSEC do not show a strong correlation. The low 
      molecular weight cutoff of HTAF4 is approximately 5x10(4) as a result of 
      relatively large pores in the HTAF4 channel membrane. HTAF4 is, therefore, 
      currently not suited to analyze low molecular weight materials.
FAU - Mes, E P C
AU  - Mes EP
AD  - Analytical Sciences Terneuzen, Dow Benelux B.V., 446 Bldg, P.O. Box 48, 4530 AA, 
      Terneuzen, The Netherlands. emes@dow.com
FAU - de Jonge, H
AU  - de Jonge H
FAU - Klein, T
AU  - Klein T
FAU - Welz, R R
AU  - Welz RR
FAU - Gillespie, D T
AU  - Gillespie DT
LA  - eng
PT  - Journal Article
DEP - 20070404
PL  - Netherlands
TA  - J Chromatogr A
JT  - Journal of chromatography. A
JID - 9318488
RN  - 0 (Polyethylenes)
SB  - IM
MH  - Fractionation, Field Flow/instrumentation/*methods
MH  - Hot Temperature
MH  - Light
MH  - Molecular Weight
MH  - Polyethylenes/*isolation & purification
MH  - Scattering, Radiation
MH  - Spectrophotometry, Infrared
MH  - Viscosity
EDAT- 2007/04/20 09:00
MHDA- 2007/09/07 09:00
CRDT- 2007/04/20 09:00
PHST- 2007/01/09 00:00 [received]
PHST- 2007/03/09 00:00 [revised]
PHST- 2007/03/30 00:00 [accepted]
PHST- 2007/04/20 09:00 [pubmed]
PHST- 2007/09/07 09:00 [medline]
PHST- 2007/04/20 09:00 [entrez]
AID - S0021-9673(07)00632-2 [pii]
AID - 10.1016/j.chroma.2007.03.116 [doi]
PST - ppublish
SO  - J Chromatogr A. 2007 Jun 22;1154(1-2):319-30. doi: 10.1016/j.chroma.2007.03.116. 
      Epub 2007 Apr 4.