Deformulation of commercial linear low‐density polyethylene resins by advanced fractionation and analysis
Linear low density polyethylene (LLDPE) exhibits a complex molecular structure that is characterized by molar mass and chemical composition distributions. Both molecular parameters complementarily influence the final application properties. Typically, the molecular structure of commercial polyolefin...
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| Veröffentlicht in: | Polymer international 2020-03, Vol.69 (3), p.291-300 |
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| creator | Sigwinta, Mawande Ndiripo, Anthony Wewers, Francois Pasch, Harald |
| description | Linear low density polyethylene (LLDPE) exhibits a complex molecular structure that is characterized by molar mass and chemical composition distributions. Both molecular parameters complementarily influence the final application properties. Typically, the molecular structure of commercial polyolefins is characterized by a set of technical parameters including the melt flow index, the crystallization and melting temperatures and the comonomer content as obtained using Fourier transform infrared or NMR spectroscopy. LLDPEs with high comonomer contents are typically regarded as plastomers or elastomers. Due to their low crystallinities, characterization of these materials using crystallization‐based analytical techniques is of limited use since the majority of the material is rather amorphous. Such materials need specific alternative analytical methods that may be based on molar mass and/or chemical composition fractionation. Here it is shown that for a comprehensive analysis of LLDPEs with similar bulk properties, preparative molar mass fractionation (pMMF) and advanced analysis of the fractions are required. The pMMF fractions are comprehensively analyzed using size exclusion chromatography, differential scanning calorimetry and high‐temperature high‐performance liquid chromatography to provide detailed information on molar mass and copolymer composition. Correlated information of these molecular parameters is obtained by comprehensive two‐dimensional liquid chromatography. © 2019 Society of Chemical Industry
An experimental protocol for the comprehensive analysis of the molecular composition of linear low‐density polyethylene with high comonomer contents is presented. |
| doi_str_mv | 10.1002/pi.5950 |
| format | Article |
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An experimental protocol for the comprehensive analysis of the molecular composition of linear low‐density polyethylene with high comonomer contents is presented.</description><identifier>ISSN: 0959-8103</identifier><identifier>EISSN: 1097-0126</identifier><identifier>DOI: 10.1002/pi.5950</identifier><language>eng</language><publisher>Chichester, UK: John Wiley & Sons, Ltd</publisher><subject>Amorphous materials ; Chemical composition ; Chromatography ; Crystallization ; crystallization fractionation ; Density ; Differential scanning calorimetry ; Elastomers ; Fourier analysis ; Fourier transforms ; Fractionation ; linear low‐density polyethylene ; Liquid chromatography ; Low density polyethylenes ; Magnetic resonance spectroscopy ; Melt flow index ; Molecular structure ; NMR ; NMR spectroscopy ; Nuclear magnetic resonance ; Organic chemistry ; Parameters ; Polyethylene ; Polyolefins ; preparative molar mass fractionation ; Resins ; Size exclusion chromatography</subject><ispartof>Polymer international, 2020-03, Vol.69 (3), p.291-300</ispartof><rights>2019 Society of Chemical Industry</rights><rights>Copyright © 2020 Society of Chemical Industry</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c3260-ee470f8f4f111b954f278947757bf45b9dba70351936a3bf3d7df37c462bfe893</citedby><cites>FETCH-LOGICAL-c3260-ee470f8f4f111b954f278947757bf45b9dba70351936a3bf3d7df37c462bfe893</cites><orcidid>0000-0003-1132-3393</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1002%2Fpi.5950$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2Fpi.5950$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,780,784,1417,27924,27925,45574,45575</link.rule.ids></links><search><creatorcontrib>Sigwinta, Mawande</creatorcontrib><creatorcontrib>Ndiripo, Anthony</creatorcontrib><creatorcontrib>Wewers, Francois</creatorcontrib><creatorcontrib>Pasch, Harald</creatorcontrib><title>Deformulation of commercial linear low‐density polyethylene resins by advanced fractionation and analysis</title><title>Polymer international</title><description>Linear low density polyethylene (LLDPE) exhibits a complex molecular structure that is characterized by molar mass and chemical composition distributions. Both molecular parameters complementarily influence the final application properties. Typically, the molecular structure of commercial polyolefins is characterized by a set of technical parameters including the melt flow index, the crystallization and melting temperatures and the comonomer content as obtained using Fourier transform infrared or NMR spectroscopy. LLDPEs with high comonomer contents are typically regarded as plastomers or elastomers. Due to their low crystallinities, characterization of these materials using crystallization‐based analytical techniques is of limited use since the majority of the material is rather amorphous. Such materials need specific alternative analytical methods that may be based on molar mass and/or chemical composition fractionation. Here it is shown that for a comprehensive analysis of LLDPEs with similar bulk properties, preparative molar mass fractionation (pMMF) and advanced analysis of the fractions are required. The pMMF fractions are comprehensively analyzed using size exclusion chromatography, differential scanning calorimetry and high‐temperature high‐performance liquid chromatography to provide detailed information on molar mass and copolymer composition. Correlated information of these molecular parameters is obtained by comprehensive two‐dimensional liquid chromatography. © 2019 Society of Chemical Industry
An experimental protocol for the comprehensive analysis of the molecular composition of linear low‐density polyethylene with high comonomer contents is presented.</description><subject>Amorphous materials</subject><subject>Chemical composition</subject><subject>Chromatography</subject><subject>Crystallization</subject><subject>crystallization fractionation</subject><subject>Density</subject><subject>Differential scanning calorimetry</subject><subject>Elastomers</subject><subject>Fourier analysis</subject><subject>Fourier transforms</subject><subject>Fractionation</subject><subject>linear low‐density polyethylene</subject><subject>Liquid chromatography</subject><subject>Low density polyethylenes</subject><subject>Magnetic resonance spectroscopy</subject><subject>Melt flow index</subject><subject>Molecular structure</subject><subject>NMR</subject><subject>NMR spectroscopy</subject><subject>Nuclear magnetic resonance</subject><subject>Organic chemistry</subject><subject>Parameters</subject><subject>Polyethylene</subject><subject>Polyolefins</subject><subject>preparative molar mass fractionation</subject><subject>Resins</subject><subject>Size exclusion chromatography</subject><issn>0959-8103</issn><issn>1097-0126</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNp10M1KxDAUBeAgCo6j-AoBFy6kY9I0TbOU8RcGdKHrkLY3mDFtatJx6M5H8Bl9EjvWrYvL3XwcDgehU0oWlJD0srMLLjnZQzNKpEgITfN9NCOSy6SghB2ioxjXhJBCSjlDb9dgfGg2TvfWt9gbXPmmgVBZ7bCzLeiAnd9-f37V0EbbD7jzboD-dXDQAg4QbRtxOWBdf-i2ghqboKtd1hSo23o87YZo4zE6MNpFOPn7c_Rye_O8vE9Wj3cPy6tVUrE0JwlAJogpTGYopaXkmUlFITMhuChNxktZl1oQxqlkuWalYbWoDRNVlqelgUKyOTqbcrvg3zcQe7X2mzCWiCplPJU5y_NsVOeTqoKPMYBRXbCNDoOiRO2WVJ1VuyVHeTHJrXUw_MfU08Ov_gFMRnZk</recordid><startdate>202003</startdate><enddate>202003</enddate><creator>Sigwinta, Mawande</creator><creator>Ndiripo, Anthony</creator><creator>Wewers, Francois</creator><creator>Pasch, Harald</creator><general>John Wiley & Sons, Ltd</general><general>Wiley Subscription Services, Inc</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8FD</scope><scope>F28</scope><scope>FR3</scope><scope>JG9</scope><orcidid>https://orcid.org/0000-0003-1132-3393</orcidid></search><sort><creationdate>202003</creationdate><title>Deformulation of commercial linear low‐density polyethylene resins by advanced fractionation and analysis</title><author>Sigwinta, Mawande ; Ndiripo, Anthony ; Wewers, Francois ; Pasch, Harald</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c3260-ee470f8f4f111b954f278947757bf45b9dba70351936a3bf3d7df37c462bfe893</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Amorphous materials</topic><topic>Chemical composition</topic><topic>Chromatography</topic><topic>Crystallization</topic><topic>crystallization fractionation</topic><topic>Density</topic><topic>Differential scanning calorimetry</topic><topic>Elastomers</topic><topic>Fourier analysis</topic><topic>Fourier transforms</topic><topic>Fractionation</topic><topic>linear low‐density polyethylene</topic><topic>Liquid chromatography</topic><topic>Low density polyethylenes</topic><topic>Magnetic resonance spectroscopy</topic><topic>Melt flow index</topic><topic>Molecular structure</topic><topic>NMR</topic><topic>NMR spectroscopy</topic><topic>Nuclear magnetic resonance</topic><topic>Organic chemistry</topic><topic>Parameters</topic><topic>Polyethylene</topic><topic>Polyolefins</topic><topic>preparative molar mass fractionation</topic><topic>Resins</topic><topic>Size exclusion chromatography</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Sigwinta, Mawande</creatorcontrib><creatorcontrib>Ndiripo, Anthony</creatorcontrib><creatorcontrib>Wewers, Francois</creatorcontrib><creatorcontrib>Pasch, Harald</creatorcontrib><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Technology Research Database</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><collection>Materials Research Database</collection><jtitle>Polymer international</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Sigwinta, Mawande</au><au>Ndiripo, Anthony</au><au>Wewers, Francois</au><au>Pasch, Harald</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Deformulation of commercial linear low‐density polyethylene resins by advanced fractionation and analysis</atitle><jtitle>Polymer international</jtitle><date>2020-03</date><risdate>2020</risdate><volume>69</volume><issue>3</issue><spage>291</spage><epage>300</epage><pages>291-300</pages><issn>0959-8103</issn><eissn>1097-0126</eissn><abstract>Linear low density polyethylene (LLDPE) exhibits a complex molecular structure that is characterized by molar mass and chemical composition distributions. Both molecular parameters complementarily influence the final application properties. Typically, the molecular structure of commercial polyolefins is characterized by a set of technical parameters including the melt flow index, the crystallization and melting temperatures and the comonomer content as obtained using Fourier transform infrared or NMR spectroscopy. LLDPEs with high comonomer contents are typically regarded as plastomers or elastomers. Due to their low crystallinities, characterization of these materials using crystallization‐based analytical techniques is of limited use since the majority of the material is rather amorphous. Such materials need specific alternative analytical methods that may be based on molar mass and/or chemical composition fractionation. Here it is shown that for a comprehensive analysis of LLDPEs with similar bulk properties, preparative molar mass fractionation (pMMF) and advanced analysis of the fractions are required. The pMMF fractions are comprehensively analyzed using size exclusion chromatography, differential scanning calorimetry and high‐temperature high‐performance liquid chromatography to provide detailed information on molar mass and copolymer composition. Correlated information of these molecular parameters is obtained by comprehensive two‐dimensional liquid chromatography. © 2019 Society of Chemical Industry
An experimental protocol for the comprehensive analysis of the molecular composition of linear low‐density polyethylene with high comonomer contents is presented.</abstract><cop>Chichester, UK</cop><pub>John Wiley & Sons, Ltd</pub><doi>10.1002/pi.5950</doi><tpages>11</tpages><orcidid>https://orcid.org/0000-0003-1132-3393</orcidid></addata></record> |
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| subjects | Amorphous materials Chemical composition Chromatography Crystallization crystallization fractionation Density Differential scanning calorimetry Elastomers Fourier analysis Fourier transforms Fractionation linear low‐density polyethylene Liquid chromatography Low density polyethylenes Magnetic resonance spectroscopy Melt flow index Molecular structure NMR NMR spectroscopy Nuclear magnetic resonance Organic chemistry Parameters Polyethylene Polyolefins preparative molar mass fractionation Resins Size exclusion chromatography |
| title | Deformulation of commercial linear low‐density polyethylene resins by advanced fractionation and analysis |
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