An Evaluation of Dilution Rheology for the Characterization of Long Chain Branching of Polyethylenes
The purpose of this paper was to re-evaluate the novel rheological method of Crosby et al. [J. Rheol. 46 (2002) 401] to characterise long chain branching (LCB) in polyethylenes (PE) using the rheology of concentrated solutions. The feasibility of this dilution method centred on knowing the class of...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
De Gruyter
2006-04-01
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| Series: | Applied Rheology |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/arh-2006-0006 |
| _version_ | 1818601870542766080 |
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| author | Chai Choon K. Ang Swe Chong |
| author_facet | Chai Choon K. Ang Swe Chong |
| author_sort | Chai Choon K. |
| collection | DOAJ |
| description | The purpose of this paper was to re-evaluate the novel rheological method of Crosby et al. [J. Rheol. 46 (2002) 401] to characterise long chain branching (LCB) in polyethylenes (PE) using the rheology of concentrated solutions. The feasibility of this dilution method centred on knowing the class of branched material and the molecular tube theory-based technique for the determination of two topological parameters (n, bU), where n is the number of entanglements between branch points while bU is the probability of meeting a branch point when tracing along the molecule from a random monomer against the direction of polymerisation. This paper proposes new possible approaches to calculate the two topological parameters (n, bU) set for metallocene polyethylenes (mPE), and their ambiguity discussed, as the results are dependent on the approach taken, though the previous authors mentioned only one. In addition, their approach requires an input value of LCB/1000C obtained from the standard analytical solution (SEC-V or SEC-LALLS) methods, hence, until now, without proper demonstration of the potential advantage of the dilution rheology method for LCB characterisation, as the main premise of their published article was to characterise the degree of LCB via rheological measurements without recourse to other methods of LCB characterisation. |
| first_indexed | 2024-12-16T12:58:15Z |
| format | Article |
| id | doaj.art-b3a1faaca3ca4a69b6b7c318ebd3d747 |
| institution | Directory Open Access Journal |
| issn | 1617-8106 |
| language | English |
| last_indexed | 2024-12-16T12:58:15Z |
| publishDate | 2006-04-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Applied Rheology |
| spelling | doaj.art-b3a1faaca3ca4a69b6b7c318ebd3d7472022-12-21T22:30:56ZengDe GruyterApplied Rheology1617-81062006-04-011629010110.1515/arh-2006-0006An Evaluation of Dilution Rheology for the Characterization of Long Chain Branching of PolyethylenesChai Choon K.0Ang Swe Chong1Innovene Manufacturing France, Research and Technology Centre, B.P. 6, 13117Lavéra, FranceInnovene Manufacturing France, Research and Technology Centre, B.P. 6, 13117Lavéra, FranceThe purpose of this paper was to re-evaluate the novel rheological method of Crosby et al. [J. Rheol. 46 (2002) 401] to characterise long chain branching (LCB) in polyethylenes (PE) using the rheology of concentrated solutions. The feasibility of this dilution method centred on knowing the class of branched material and the molecular tube theory-based technique for the determination of two topological parameters (n, bU), where n is the number of entanglements between branch points while bU is the probability of meeting a branch point when tracing along the molecule from a random monomer against the direction of polymerisation. This paper proposes new possible approaches to calculate the two topological parameters (n, bU) set for metallocene polyethylenes (mPE), and their ambiguity discussed, as the results are dependent on the approach taken, though the previous authors mentioned only one. In addition, their approach requires an input value of LCB/1000C obtained from the standard analytical solution (SEC-V or SEC-LALLS) methods, hence, until now, without proper demonstration of the potential advantage of the dilution rheology method for LCB characterisation, as the main premise of their published article was to characterise the degree of LCB via rheological measurements without recourse to other methods of LCB characterisation.https://doi.org/10.1515/arh-2006-0006polyethylenelong chain branchingrheologypolymermetallocenemolecular topology |
| spellingShingle | Chai Choon K. Ang Swe Chong An Evaluation of Dilution Rheology for the Characterization of Long Chain Branching of Polyethylenes Applied Rheology polyethylene long chain branching rheology polymer metallocene molecular topology |
| title | An Evaluation of Dilution Rheology for the Characterization of Long Chain Branching of Polyethylenes |
| title_full | An Evaluation of Dilution Rheology for the Characterization of Long Chain Branching of Polyethylenes |
| title_fullStr | An Evaluation of Dilution Rheology for the Characterization of Long Chain Branching of Polyethylenes |
| title_full_unstemmed | An Evaluation of Dilution Rheology for the Characterization of Long Chain Branching of Polyethylenes |
| title_short | An Evaluation of Dilution Rheology for the Characterization of Long Chain Branching of Polyethylenes |
| title_sort | evaluation of dilution rheology for the characterization of long chain branching of polyethylenes |
| topic | polyethylene long chain branching rheology polymer metallocene molecular topology |
| url | https://doi.org/10.1515/arh-2006-0006 |
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