The Effect of Feeding Sequence on the Structure and Properties of the Ethylene/1-Octene Copolymer in the Semi-Continuous Polymerization Reaction System
The performance of ethylene/1-octene copolymer primarily depends on the microstructure of the polymer chain. This study employed a new method to control the inter-distribution of hexyl chain branches directly on the backbone of the ethylene/1-octene copolymer. Three ethylene/1-octene copolymers with...
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MDPI AG
2024-02-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/16/4/526 |
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| author | Qiqi He Ruijun Zhang Yuexin Hu Junhua Li Hongbo Yu Yong Zheng Jianhua Qian |
| author_facet | Qiqi He Ruijun Zhang Yuexin Hu Junhua Li Hongbo Yu Yong Zheng Jianhua Qian |
| author_sort | Qiqi He |
| collection | DOAJ |
| description | The performance of ethylene/1-octene copolymer primarily depends on the microstructure of the polymer chain. This study employed a new method to control the inter-distribution of hexyl chain branches directly on the backbone of the ethylene/1-octene copolymer. Three ethylene/1-octene copolymers with different inter-distributions of hexyl chain branches were synthesized using [Me<sub>2</sub>Si(C<sub>5</sub>Me<sub>4</sub>) (N<i><sup>t</sup></i>Bu)] TiCl<sub>2</sub> (Ti–CGC) by different feeding sequences in the semi-continuous polymerization reaction system. The three copolymers were named according to the feeding sequence of the materials: ethylene/1-octene/Ti–CGC (EOC), 1-octene/Ti–CGC/ethylene (OCE), and ethylene/Ti–CGC/1-octene (ECO), respectively. The structure and properties of the copolymers were characterized using HT-GPC, <sup>13</sup>C-NMR, DSC, WAXD, DMA, MI, and Uniaxial Tension Test. The results showed that the feeding sequence greatly affected the comonomer distribution of the molecular chains, molecular weight, molecular weight distribution, and chemical composition of the copolymers, consequently influencing their thermal performance and mechanical properties. Thus, it is probable that one could obtain an ethylene/1-octene copolymer with designed properties by controlling the feeding sequence during the ethylene/1-octene semi-continuous copolymerization process. |
| first_indexed | 2024-03-07T22:15:35Z |
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| id | doaj.art-0e40a243666e4b28801f516751ceef76 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-07T22:15:35Z |
| publishDate | 2024-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-0e40a243666e4b28801f516751ceef762024-02-23T15:32:20ZengMDPI AGPolymers2073-43602024-02-0116452610.3390/polym16040526The Effect of Feeding Sequence on the Structure and Properties of the Ethylene/1-Octene Copolymer in the Semi-Continuous Polymerization Reaction SystemQiqi He0Ruijun Zhang1Yuexin Hu2Junhua Li3Hongbo Yu4Yong Zheng5Jianhua Qian6College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266555, ChinaCollege of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266555, ChinaCollege of Petrochemical Engineering, Liaoning Petrochemical University, Fushun 113001, ChinaCollege of Petrochemical Engineering, Liaoning Petrochemical University, Fushun 113001, ChinaPetroChina Fushun Petrochemical, Fushun 113001, ChinaCollege of Materials and Chemical Engineering, China Three Gorges University, Yichang 443002, ChinaCollege of Petrochemical Engineering, Liaoning Petrochemical University, Fushun 113001, ChinaThe performance of ethylene/1-octene copolymer primarily depends on the microstructure of the polymer chain. This study employed a new method to control the inter-distribution of hexyl chain branches directly on the backbone of the ethylene/1-octene copolymer. Three ethylene/1-octene copolymers with different inter-distributions of hexyl chain branches were synthesized using [Me<sub>2</sub>Si(C<sub>5</sub>Me<sub>4</sub>) (N<i><sup>t</sup></i>Bu)] TiCl<sub>2</sub> (Ti–CGC) by different feeding sequences in the semi-continuous polymerization reaction system. The three copolymers were named according to the feeding sequence of the materials: ethylene/1-octene/Ti–CGC (EOC), 1-octene/Ti–CGC/ethylene (OCE), and ethylene/Ti–CGC/1-octene (ECO), respectively. The structure and properties of the copolymers were characterized using HT-GPC, <sup>13</sup>C-NMR, DSC, WAXD, DMA, MI, and Uniaxial Tension Test. The results showed that the feeding sequence greatly affected the comonomer distribution of the molecular chains, molecular weight, molecular weight distribution, and chemical composition of the copolymers, consequently influencing their thermal performance and mechanical properties. Thus, it is probable that one could obtain an ethylene/1-octene copolymer with designed properties by controlling the feeding sequence during the ethylene/1-octene semi-continuous copolymerization process.https://www.mdpi.com/2073-4360/16/4/526ethylene-1-octene copolymerfeeding sequencechain microstructurecopolymer property |
| spellingShingle | Qiqi He Ruijun Zhang Yuexin Hu Junhua Li Hongbo Yu Yong Zheng Jianhua Qian The Effect of Feeding Sequence on the Structure and Properties of the Ethylene/1-Octene Copolymer in the Semi-Continuous Polymerization Reaction System Polymers ethylene-1-octene copolymer feeding sequence chain microstructure copolymer property |
| title | The Effect of Feeding Sequence on the Structure and Properties of the Ethylene/1-Octene Copolymer in the Semi-Continuous Polymerization Reaction System |
| title_full | The Effect of Feeding Sequence on the Structure and Properties of the Ethylene/1-Octene Copolymer in the Semi-Continuous Polymerization Reaction System |
| title_fullStr | The Effect of Feeding Sequence on the Structure and Properties of the Ethylene/1-Octene Copolymer in the Semi-Continuous Polymerization Reaction System |
| title_full_unstemmed | The Effect of Feeding Sequence on the Structure and Properties of the Ethylene/1-Octene Copolymer in the Semi-Continuous Polymerization Reaction System |
| title_short | The Effect of Feeding Sequence on the Structure and Properties of the Ethylene/1-Octene Copolymer in the Semi-Continuous Polymerization Reaction System |
| title_sort | effect of feeding sequence on the structure and properties of the ethylene 1 octene copolymer in the semi continuous polymerization reaction system |
| topic | ethylene-1-octene copolymer feeding sequence chain microstructure copolymer property |
| url | https://www.mdpi.com/2073-4360/16/4/526 |
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