Single Capillary Rheometer Technique for Determining Molecular Weight Distribution of Conventional and Metallocene Catalysed Polyethylenes

Bronagh Millar*, Gerard McNally, W. Raymond Murphy

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

Abstract

A new approach to determining the molecular
weight distribution of metallocene (mPE) and
conventional polyethylenes using a single capillary
rheometer technique is reported here. The melt flow
properties of a range of 17 mLLDPEs and 4
conventional LLDPEs with different MFIs, densities
and co-monomer types (butene, hexene, octene), from
six different suppliers were investigated using this
technique. The results show a direct correlation between
melt flow rate ratio and molecular weight distribution
(MWD,) measured by Gel Permeation
Chromatography: MWD = ( 34.2 × MFRR) − 14.5 . A
direct correlation between weight average molecular
weight (Mw) and melt flow index for the resins was also
determined
Original languageEnglish
Pages1051-1055
Number of pages5
Publication statusPublished - May 2002
EventAnnual Technical Conference of the Society of Plastics Engineers - USA, San Francisco, United States
Duration: 05 May 200209 Oct 2020

Conference

ConferenceAnnual Technical Conference of the Society of Plastics Engineers
CountryUnited States
CitySan Francisco
Period05/05/200209/10/2020

Keywords

  • Rheology
  • metallocene polyethylene
  • Molecular weight distribution

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