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

Bronagh Millar; Gerard McNally; W. Raymond Murphy

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

School of Mechanical and Aerospace Engineering

Research output: Contribution to conference › Paper › peer-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 language	English
Pages	1051-1055
Number of pages	5
Publication status	Published - May 2002
Event	Annual Technical Conference of the Society of Plastics Engineers - USA, San Francisco, United States Duration: 05 May 2002 → 09 Oct 2020

Conference

Conference	Annual Technical Conference of the Society of Plastics Engineers
Country	United States
City	San Francisco
Period	05/05/2002 → 09/10/2020

Keywords

Rheology
metallocene polyethylene
Molecular weight distribution

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@conference{0b82de7f164745949720b0ee46a6f139,

title = "Single Capillary Rheometer Technique for Determining Molecular Weight Distribution of Conventional and Metallocene Catalysed Polyethylenes",

abstract = "A new approach to determining the molecularweight distribution of metallocene (mPE) andconventional polyethylenes using a single capillaryrheometer technique is reported here. The melt flowproperties of a range of 17 mLLDPEs and 4conventional LLDPEs with different MFIs, densitiesand co-monomer types (butene, hexene, octene), fromsix different suppliers were investigated using thistechnique. The results show a direct correlation betweenmelt flow rate ratio and molecular weight distribution(MWD,) measured by Gel PermeationChromatography: MWD = ( 34.2 × MFRR) − 14.5 . Adirect correlation between weight average molecularweight (Mw) and melt flow index for the resins was alsodetermined",

keywords = "Rheology, metallocene polyethylene, Molecular weight distribution",

author = "Bronagh Millar and Gerard McNally and Murphy, {W. Raymond}",

year = "2002",

month = may,

language = "English",

pages = "1051--1055",

note = "Annual Technical Conference of the Society of Plastics Engineers ; Conference date: 05-05-2002 Through 09-10-2020",

}

Single Capillary Rheometer Technique for Determining Molecular Weight Distribution of Conventional and Metallocene Catalysed Polyethylenes. / Millar, Bronagh; McNally, Gerard; Murphy, W. Raymond.

2002. 1051-1055 Paper presented at Annual Technical Conference of the Society of Plastics Engineers, San Francisco, United States.

Research output: Contribution to conference › Paper › peer-review

TY - CONF

T1 - Single Capillary Rheometer Technique for Determining Molecular Weight Distribution of Conventional and Metallocene Catalysed Polyethylenes

AU - Millar, Bronagh

AU - McNally, Gerard

AU - Murphy, W. Raymond

PY - 2002/5

Y1 - 2002/5

N2 - A new approach to determining the molecularweight distribution of metallocene (mPE) andconventional polyethylenes using a single capillaryrheometer technique is reported here. The melt flowproperties of a range of 17 mLLDPEs and 4conventional LLDPEs with different MFIs, densitiesand co-monomer types (butene, hexene, octene), fromsix different suppliers were investigated using thistechnique. The results show a direct correlation betweenmelt flow rate ratio and molecular weight distribution(MWD,) measured by Gel PermeationChromatography: MWD = ( 34.2 × MFRR) − 14.5 . Adirect correlation between weight average molecularweight (Mw) and melt flow index for the resins was alsodetermined

AB - A new approach to determining the molecularweight distribution of metallocene (mPE) andconventional polyethylenes using a single capillaryrheometer technique is reported here. The melt flowproperties of a range of 17 mLLDPEs and 4conventional LLDPEs with different MFIs, densitiesand co-monomer types (butene, hexene, octene), fromsix different suppliers were investigated using thistechnique. The results show a direct correlation betweenmelt flow rate ratio and molecular weight distribution(MWD,) measured by Gel PermeationChromatography: MWD = ( 34.2 × MFRR) − 14.5 . Adirect correlation between weight average molecularweight (Mw) and melt flow index for the resins was alsodetermined

KW - Rheology

KW - metallocene polyethylene

KW - Molecular weight distribution

M3 - Paper

SP - 1051

EP - 1055

T2 - Annual Technical Conference of the Society of Plastics Engineers

Y2 - 5 May 2002 through 9 October 2020

ER -