Relation Between Structure and Characteristics of Elastomers Prepared by Ethylene and 1-Butene Gas Oligamerization and Copolymerization with Highly Active Catalyst

Abstract

Abstract: Two elastomers have been prepared by gas copolymerization of ethylene and 1 butene with new highly active catalyst TiCl 4, Ti(OBu)₄/MgCl 2, SiO₂, ZnCl₂/alcohol/AlR₃. Triad sequence and comonomer distributions, average sequence length, run numbers are determined using₁₃ C NMR. It was found that the new catalyst has the properties to catalyze ethylene and 1-butene oligamerization and copolymerization in situ . The distribution of comonomer 1-butene in copolymers is not homogeneous, and the content of [EBB] + [BBB] in triad sequence distribution of elastomer is higher than that of common LLDPE. The melting and crystallization behavior of products are investigated by the method of DSC. The products show complicated crystallization and melting behavior, and lower melting point, density and degree of crystallinity. These results can be attributed to the existence of more 1-butene blocks in the copolymers chain and their participation in crystallization. The crystallization in copolymers may be physical crosslinking points and the products display the properties of elastomer.

Key words: Oligamerization, Copolymerization, Elastomers, Sequence distribution, Melting behavior

CLC Number:

O631

TrendMD:

HU Jin-Min, WANG Hai-Hua, MAI Kan-Cheng . Relation Between Structure and Characteristics of Elastomers Prepared by Ethylene and 1-Butene Gas Oligamerization and Copolymerization with Highly Active Catalyst[J]. Chem. J. Chinese Universities, 2000, 21(4): 643.

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Relation Between Structure and Characteristics of Elastomers Prepared by Ethylene and 1-Butene Gas Oligamerization and Copolymerization with Highly Active Catalyst

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