Integrated Effect of Comonomer and Catalyst on Copolymerization of Ethylene with Allylcyclopentane or Allylcyclohexane by Using Metallocene Catalysts. Issue 25 (2nd July 2020)

• Record Type: Journal Article
• Authors: Wang, Wei; Hou, Liping; Zhang, Taoyi
• Is Part Of: ChemistrySelect. Volume 5:Issue 25(2020)
• Page Start: 7581
• Page End: 7585
• Publication Date: 2020-07-02
• Subjects: Metallocenes -- Copolymerization -- Ethylene -- Comonomer effect; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.202001213
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: An integrated effect of the catalysts and the comonomers has been observed when the copolymerizations of ethylene with allylcyclopentane or allylcyclohexane are conducted by using two metallocene catalysts. The effect results in the differences in the microstructure and macroscopic properties (e. g. the melting point and enthalpy) of the copolymers. Under the different combination of the catalysts and the comonomers, the microstructure of copolymer changes from ideal random to rich successive comonomer segment, although the two comonomers are very similar in the structure. Allylcyclohexane prefers to form the copolymer with the feature of rich successive comonomer segment, and the more random structure could be observed in the copolymer of allylcyclopentane. The catalyst used makes the difference even more pronounced. Abstract : In ethylene copolymerization catalyzed by metallocene catalysts, allylcyclopentane (ACP ) tends to form random copolymers, while allylcyclohexane (ACH ) forms the copolymers with high content of successive comonomer unit. The two catalysts tend to form random or comonomer unit dyad rich copolymers respectively. The randomness of the sequence distribution is strengthened or weakened by the combination of comonomer and catalyst used, which in turn affect the properties of the polymers.