Study of Heterogeneity of Ethylene/1-Octene Copolymers Synthesized with Zirconium and Titanium Complexes Bearing Diamine-bis(phenolate) Ligands
A series of ethylene/1-octene copolymers synthesized with diamine-bis(phenolate) complexes activated with Al(<i><sup>i</sup></i>Bu)<sub>3</sub>/[Ph<sub>3</sub>C][B(C<sub>6</sub>F<sub>5</sub>)<sub>4</sub>] were subjec...
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MDPI AG
2024-01-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/16/3/387 |
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| author | Marzena Białek Dominika Wiechoczek |
| author_facet | Marzena Białek Dominika Wiechoczek |
| author_sort | Marzena Białek |
| collection | DOAJ |
| description | A series of ethylene/1-octene copolymers synthesized with diamine-bis(phenolate) complexes activated with Al(<i><sup>i</sup></i>Bu)<sub>3</sub>/[Ph<sub>3</sub>C][B(C<sub>6</sub>F<sub>5</sub>)<sub>4</sub>] were subjected to preparative temperature rising elution fractionation (TREF). The complexes used differed in the type of metallic center (Zr or Ti) or the amine donor in the pendant arm of the ligand (NMe<sub>2</sub> or N<i><sup>i</sup></i>Pr<sub>2</sub>). The obtained fractions were then characterized via FTIR, DSC and GPC methods. It was found that all the copolymers had very broad chemical composition distributions, and the most heterogeneous was the copolymer produced by the titanium complex bearing a ligand with the N<i><sup>i</sup></i>Pr<sub>2</sub> donor group. The difference in the comonomer incorporation into the macromolecules of the fractions was as high as 8.3 mol%. The melting temperature and molecular weight of the fractions changed nearly linearly with the increased elution temperature. Copolymers produced by zirconium catalysts were also fractionated by molecular weight using the solvent/non-solvent technique with subsequent analysis of the fractions. It was shown that the fractions have a similar composition, low molecular weight distribution and very broad comonomer distribution. Therefore, the comonomer content in the fractions was not a function of the molecular weight as was observed for the copolymers synthesized with the Ziegler–Natta catalysts. |
| first_indexed | 2024-03-08T03:51:17Z |
| format | Article |
| id | doaj.art-f586624349f54f38a757d50ce86e0c73 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-08T03:51:17Z |
| publishDate | 2024-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-f586624349f54f38a757d50ce86e0c732024-02-09T15:20:54ZengMDPI AGPolymers2073-43602024-01-0116338710.3390/polym16030387Study of Heterogeneity of Ethylene/1-Octene Copolymers Synthesized with Zirconium and Titanium Complexes Bearing Diamine-bis(phenolate) LigandsMarzena Białek0Dominika Wiechoczek1Institute of Chemistry, University of Opole, Oleska 48, 45-052 Opole, PolandInstitute of Chemistry, University of Opole, Oleska 48, 45-052 Opole, PolandA series of ethylene/1-octene copolymers synthesized with diamine-bis(phenolate) complexes activated with Al(<i><sup>i</sup></i>Bu)<sub>3</sub>/[Ph<sub>3</sub>C][B(C<sub>6</sub>F<sub>5</sub>)<sub>4</sub>] were subjected to preparative temperature rising elution fractionation (TREF). The complexes used differed in the type of metallic center (Zr or Ti) or the amine donor in the pendant arm of the ligand (NMe<sub>2</sub> or N<i><sup>i</sup></i>Pr<sub>2</sub>). The obtained fractions were then characterized via FTIR, DSC and GPC methods. It was found that all the copolymers had very broad chemical composition distributions, and the most heterogeneous was the copolymer produced by the titanium complex bearing a ligand with the N<i><sup>i</sup></i>Pr<sub>2</sub> donor group. The difference in the comonomer incorporation into the macromolecules of the fractions was as high as 8.3 mol%. The melting temperature and molecular weight of the fractions changed nearly linearly with the increased elution temperature. Copolymers produced by zirconium catalysts were also fractionated by molecular weight using the solvent/non-solvent technique with subsequent analysis of the fractions. It was shown that the fractions have a similar composition, low molecular weight distribution and very broad comonomer distribution. Therefore, the comonomer content in the fractions was not a function of the molecular weight as was observed for the copolymers synthesized with the Ziegler–Natta catalysts.https://www.mdpi.com/2073-4360/16/3/387ethylene/1-octene copolymertemperature rising elution fractionationsolvent/non-solvent fractionationdiamine-bis(phenolate) complexFTIRGPC |
| spellingShingle | Marzena Białek Dominika Wiechoczek Study of Heterogeneity of Ethylene/1-Octene Copolymers Synthesized with Zirconium and Titanium Complexes Bearing Diamine-bis(phenolate) Ligands Polymers ethylene/1-octene copolymer temperature rising elution fractionation solvent/non-solvent fractionation diamine-bis(phenolate) complex FTIR GPC |
| title | Study of Heterogeneity of Ethylene/1-Octene Copolymers Synthesized with Zirconium and Titanium Complexes Bearing Diamine-bis(phenolate) Ligands |
| title_full | Study of Heterogeneity of Ethylene/1-Octene Copolymers Synthesized with Zirconium and Titanium Complexes Bearing Diamine-bis(phenolate) Ligands |
| title_fullStr | Study of Heterogeneity of Ethylene/1-Octene Copolymers Synthesized with Zirconium and Titanium Complexes Bearing Diamine-bis(phenolate) Ligands |
| title_full_unstemmed | Study of Heterogeneity of Ethylene/1-Octene Copolymers Synthesized with Zirconium and Titanium Complexes Bearing Diamine-bis(phenolate) Ligands |
| title_short | Study of Heterogeneity of Ethylene/1-Octene Copolymers Synthesized with Zirconium and Titanium Complexes Bearing Diamine-bis(phenolate) Ligands |
| title_sort | study of heterogeneity of ethylene 1 octene copolymers synthesized with zirconium and titanium complexes bearing diamine bis phenolate ligands |
| topic | ethylene/1-octene copolymer temperature rising elution fractionation solvent/non-solvent fractionation diamine-bis(phenolate) complex FTIR GPC |
| url | https://www.mdpi.com/2073-4360/16/3/387 |
| work_keys_str_mv | AT marzenabiałek studyofheterogeneityofethylene1octenecopolymerssynthesizedwithzirconiumandtitaniumcomplexesbearingdiaminebisphenolateligands AT dominikawiechoczek studyofheterogeneityofethylene1octenecopolymerssynthesizedwithzirconiumandtitaniumcomplexesbearingdiaminebisphenolateligands |