Tuning the short chain branch distribution of ethylene and 1-hexene copolymers by SiO2-supported silyl chromate catalyst with different Al-alkyl co-catalysts
SiO2-supported silyl chromate catalyst is an important industrial catalyst for production of high grade HDPE pipe materials. The control of the short chain branch (SCB) distribution using this catalyst system is still a great challenge. In this work, ethylene and 1-hexene copolymers were synthesized...
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| Format: | Article |
| Language: | English |
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Iran Polymer and Petrochemical Institute
2014-12-01
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| Series: | Polyolefins Journal |
| Subjects: | |
| Online Access: | http://poj.ippi.ac.ir/article_1045_f2a5946178d6d875874221dfe891c5d9.pdf |
| _version_ | 1828762588927754240 |
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| author | Ning Zhao Ruihua Cheng Qi Dong Xuelian He Zhen Liu Shiliang Zhang Minoru Terano Boping Liu |
| author_facet | Ning Zhao Ruihua Cheng Qi Dong Xuelian He Zhen Liu Shiliang Zhang Minoru Terano Boping Liu |
| author_sort | Ning Zhao |
| collection | DOAJ |
| description | SiO2-supported silyl chromate catalyst is an important industrial catalyst for production of high grade HDPE pipe materials. The control of the short chain branch (SCB) distribution using this catalyst system is still a great challenge. In this work, ethylene and 1-hexene copolymers were synthesized using SiO2-supported silyl chromate catalyst combined with triisobutylaluminium (TIBA), triethylaluminium (TEA) and mixed TIBA/TEA at molar ratio 1:1 (TIBA/TEA/1:1) as three different Al-alkyl co-catalysts.The temperature rising elution fractionation (TREF) and successive self-nucleation and annealing (SSA, by DSC) methods were combined to analyze the short chain branch distribution (SCBD) of these ethylene/1-hexene copolymers. The results showed that different types of co-catalyst had a great influence on SCBD of ethylene/1-hexene copolymers. The copolymer produced with TIBA showed better SCBD than the copolymer produced with TEA, and the copolymer produced with TIBA/ TEA/1:1 showed a SCBD in between those with TIBA and TEA. |
| first_indexed | 2024-12-11T01:47:43Z |
| format | Article |
| id | doaj.art-376c7e7132a94a3688d21475ba6e15a0 |
| institution | Directory Open Access Journal |
| issn | 2322-2212 2345-6868 |
| language | English |
| last_indexed | 2024-12-11T01:47:43Z |
| publishDate | 2014-12-01 |
| publisher | Iran Polymer and Petrochemical Institute |
| record_format | Article |
| series | Polyolefins Journal |
| spelling | doaj.art-376c7e7132a94a3688d21475ba6e15a02022-12-22T01:24:51ZengIran Polymer and Petrochemical InstitutePolyolefins Journal2322-22122345-68682014-12-01129310510.22063/poj.2014.10451045Tuning the short chain branch distribution of ethylene and 1-hexene copolymers by SiO2-supported silyl chromate catalyst with different Al-alkyl co-catalystsNing Zhao0Ruihua Cheng1Qi Dong2Xuelian He3Zhen Liu4Shiliang Zhang5Minoru Terano6Boping Liu7State Key Laboratory of Chemical Engineering, East China University of Science and Technology, No.130 Meilong Road, Xuhui District, Shanghai, 200237, ChinaState Key Laboratory of Chemical Engineering, East China University of Science and Technology, No.130 Meilong Road, Xuhui District, Shanghai, 200237, ChinaState Key Laboratory of Chemical Engineering, East China University of Science and Technology, No.130 Meilong Road, Xuhui District, Shanghai, 200237, ChinaState Key Laboratory of Chemical Engineering, East China University of Science and Technology, No.130 Meilong Road, Xuhui District, Shanghai, 200237, ChinaState Key Laboratory of Chemical Engineering, East China University of Science and Technology, No.130 Meilong Road, Xuhui District, Shanghai, 200237, ChinaState Key Laboratory of Chemical Engineering, East China University of Science and Technology, No.130 Meilong Road, Xuhui District, Shanghai, 200237, ChinaSchool of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, JapanState Key Laboratory of Chemical Engineering, East China University of Science and Technology, No.130 Meilong Road, Xuhui District, Shanghai, 200237, ChinaSiO2-supported silyl chromate catalyst is an important industrial catalyst for production of high grade HDPE pipe materials. The control of the short chain branch (SCB) distribution using this catalyst system is still a great challenge. In this work, ethylene and 1-hexene copolymers were synthesized using SiO2-supported silyl chromate catalyst combined with triisobutylaluminium (TIBA), triethylaluminium (TEA) and mixed TIBA/TEA at molar ratio 1:1 (TIBA/TEA/1:1) as three different Al-alkyl co-catalysts.The temperature rising elution fractionation (TREF) and successive self-nucleation and annealing (SSA, by DSC) methods were combined to analyze the short chain branch distribution (SCBD) of these ethylene/1-hexene copolymers. The results showed that different types of co-catalyst had a great influence on SCBD of ethylene/1-hexene copolymers. The copolymer produced with TIBA showed better SCBD than the copolymer produced with TEA, and the copolymer produced with TIBA/ TEA/1:1 showed a SCBD in between those with TIBA and TEA.http://poj.ippi.ac.ir/article_1045_f2a5946178d6d875874221dfe891c5d9.pdfethylene/1-hexene copolymerizationAl-alkyl co-catalystpolymerization kineticsSiO2-supported silyl chromate catalystshort chain branch distribution |
| spellingShingle | Ning Zhao Ruihua Cheng Qi Dong Xuelian He Zhen Liu Shiliang Zhang Minoru Terano Boping Liu Tuning the short chain branch distribution of ethylene and 1-hexene copolymers by SiO2-supported silyl chromate catalyst with different Al-alkyl co-catalysts Polyolefins Journal ethylene/1-hexene copolymerization Al-alkyl co-catalyst polymerization kinetics SiO2-supported silyl chromate catalyst short chain branch distribution |
| title | Tuning the short chain branch distribution of ethylene and 1-hexene copolymers by SiO2-supported silyl chromate catalyst with different Al-alkyl co-catalysts |
| title_full | Tuning the short chain branch distribution of ethylene and 1-hexene copolymers by SiO2-supported silyl chromate catalyst with different Al-alkyl co-catalysts |
| title_fullStr | Tuning the short chain branch distribution of ethylene and 1-hexene copolymers by SiO2-supported silyl chromate catalyst with different Al-alkyl co-catalysts |
| title_full_unstemmed | Tuning the short chain branch distribution of ethylene and 1-hexene copolymers by SiO2-supported silyl chromate catalyst with different Al-alkyl co-catalysts |
| title_short | Tuning the short chain branch distribution of ethylene and 1-hexene copolymers by SiO2-supported silyl chromate catalyst with different Al-alkyl co-catalysts |
| title_sort | tuning the short chain branch distribution of ethylene and 1 hexene copolymers by sio2 supported silyl chromate catalyst with different al alkyl co catalysts |
| topic | ethylene/1-hexene copolymerization Al-alkyl co-catalyst polymerization kinetics SiO2-supported silyl chromate catalyst short chain branch distribution |
| url | http://poj.ippi.ac.ir/article_1045_f2a5946178d6d875874221dfe891c5d9.pdf |
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