Homo- and Copolymerizations of Ethylene and Norbornene Using Bis(β-ketoamino) Titanium Catalysts Containing Pyrazolone Rings

Homo- and Copolymerizations of Ethylene and Norbornene Using Bis(β-ketoamino) Titanium Catalysts Containing Pyrazolone Rings

A series of bis(β-ketoamino) titanium complexes containing pyrazolone rings (1–3) have been synthesized, characterized, and used as precursors for homo- and copolymerization of ethylene and norbornene. The titanium complexes activated with methylaluminoxane (MAO) exhibited good activities for homopo...

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Main Authors: Lixia Pei, San He, Jie Gao, Heng Liao, Haiyang Gao
Format: Article
Language:English
Published: MDPI AG 2017-06-01
Series:Polymers
Subjects:
bis(β-ketoamino) titanium catalyst
ethylene
norbornene
polymerization
Online Access:http://www.mdpi.com/2073-4360/9/7/262
id doaj-254f9a70da794e5195865e6f9db31edd
record_format Article
spelling doaj-254f9a70da794e5195865e6f9db31edd2020-11-24T23:19:33ZengMDPI AGPolymers2073-43602017-06-019726210.3390/polym9070262polym9070262Homo- and Copolymerizations of Ethylene and Norbornene Using Bis(β-ketoamino) Titanium Catalysts Containing Pyrazolone RingsLixia Pei0San He1Jie Gao2Heng Liao3Haiyang Gao4State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610550, ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610550, ChinaSchool of Materials Science and Engineering, PCFM Lab, GD HPPC Lab, Sun Yat-sen University, Guangzhou 510275, ChinaSchool of Materials Science and Engineering, PCFM Lab, GD HPPC Lab, Sun Yat-sen University, Guangzhou 510275, ChinaSchool of Materials Science and Engineering, PCFM Lab, GD HPPC Lab, Sun Yat-sen University, Guangzhou 510275, ChinaA series of bis(β-ketoamino) titanium complexes containing pyrazolone rings (1–3) have been synthesized, characterized, and used as precursors for homo- and copolymerization of ethylene and norbornene. The titanium complexes activated with methylaluminoxane (MAO) exhibited good activities for homopolymerization of ethylene (E) to produce linear polyethylenes (PEs). Ethylene–norbornene copolymers (E–N) were also prepared by these catalysts with moderate activities, and influences of ligand substituents and norbornene addition on copolymer microstructure were studied in detail. Microstructure analysis of the E–N copolymers by 13C NMR and differential scanning calorimetry (DSC) techniques showed that alternating (ENEN) and isolated (ENEE) norbornene predominately appeared in the copolymer chain, and the NN dyad and NNN triad sequences were also present in the copolymers obtained by the less bulky catalyst 1.http://www.mdpi.com/2073-4360/9/7/262bis(β-ketoamino) titanium catalystethylenenorbornenepolymerization
collection DOAJ
language English
format Article
sources DOAJ
author Lixia Pei
San He
Jie Gao
Heng Liao
Haiyang Gao
spellingShingle Lixia Pei
San He
Jie Gao
Heng Liao
Haiyang Gao
Homo- and Copolymerizations of Ethylene and Norbornene Using Bis(β-ketoamino) Titanium Catalysts Containing Pyrazolone Rings
Polymers
bis(β-ketoamino) titanium catalyst
ethylene
norbornene
polymerization
author_facet Lixia Pei
San He
Jie Gao
Heng Liao
Haiyang Gao
author_sort Lixia Pei
title Homo- and Copolymerizations of Ethylene and Norbornene Using Bis(β-ketoamino) Titanium Catalysts Containing Pyrazolone Rings
title_short Homo- and Copolymerizations of Ethylene and Norbornene Using Bis(β-ketoamino) Titanium Catalysts Containing Pyrazolone Rings
title_full Homo- and Copolymerizations of Ethylene and Norbornene Using Bis(β-ketoamino) Titanium Catalysts Containing Pyrazolone Rings
title_fullStr Homo- and Copolymerizations of Ethylene and Norbornene Using Bis(β-ketoamino) Titanium Catalysts Containing Pyrazolone Rings
title_full_unstemmed Homo- and Copolymerizations of Ethylene and Norbornene Using Bis(β-ketoamino) Titanium Catalysts Containing Pyrazolone Rings
title_sort homo- and copolymerizations of ethylene and norbornene using bis(β-ketoamino) titanium catalysts containing pyrazolone rings
publisher MDPI AG
series Polymers
issn 2073-4360
publishDate 2017-06-01
description A series of bis(β-ketoamino) titanium complexes containing pyrazolone rings (1–3) have been synthesized, characterized, and used as precursors for homo- and copolymerization of ethylene and norbornene. The titanium complexes activated with methylaluminoxane (MAO) exhibited good activities for homopolymerization of ethylene (E) to produce linear polyethylenes (PEs). Ethylene–norbornene copolymers (E–N) were also prepared by these catalysts with moderate activities, and influences of ligand substituents and norbornene addition on copolymer microstructure were studied in detail. Microstructure analysis of the E–N copolymers by 13C NMR and differential scanning calorimetry (DSC) techniques showed that alternating (ENEN) and isolated (ENEE) norbornene predominately appeared in the copolymer chain, and the NN dyad and NNN triad sequences were also present in the copolymers obtained by the less bulky catalyst 1.
topic bis(β-ketoamino) titanium catalyst
ethylene
norbornene
polymerization
url http://www.mdpi.com/2073-4360/9/7/262
work_keys_str_mv AT lixiapei homoandcopolymerizationsofethyleneandnorborneneusingbisbketoaminotitaniumcatalystscontainingpyrazolonerings
AT sanhe homoandcopolymerizationsofethyleneandnorborneneusingbisbketoaminotitaniumcatalystscontainingpyrazolonerings
AT jiegao homoandcopolymerizationsofethyleneandnorborneneusingbisbketoaminotitaniumcatalystscontainingpyrazolonerings
AT hengliao homoandcopolymerizationsofethyleneandnorborneneusingbisbketoaminotitaniumcatalystscontainingpyrazolonerings
AT haiyanggao homoandcopolymerizationsofethyleneandnorborneneusingbisbketoaminotitaniumcatalystscontainingpyrazolonerings
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