Ethylene/Myrcene Copolymers as New Bio-Based Elastomers Prepared by Coordination Polymerization Using Titanium Catalysts

The synthesis of ethylene/myrcene copolymers was performed using half-titanocene catalysts in the presence of a methylaluminoxane (MAO) cocatalyst. Cyclopentadienyl-phenoxide catalysts, Cp*TiCl2(O-2,6- i Pr2-4-RC6H2) [R = H (1), SiEt3 (2)], showed rather efficient myrcene (My) incorporation to affor...

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Bibliographic Details
Published in:Macromolecules 2021-11, Vol.54 (21), p.10049-10058
Main Authors: Kitphaitun, Suphitchaya, Chaimongkolkunasin, Sapanna, Manit, Jeeranun, Makino, Ryoji, Kadota, Joji, Hirano, Hiroshi, Nomura, Kotohiro
Format: Article
Language:English
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Summary:The synthesis of ethylene/myrcene copolymers was performed using half-titanocene catalysts in the presence of a methylaluminoxane (MAO) cocatalyst. Cyclopentadienyl-phenoxide catalysts, Cp*TiCl2(O-2,6- i Pr2-4-RC6H2) [R = H (1), SiEt3 (2)], showed rather efficient myrcene (My) incorporation to afford high-molecular-weight (semicrystalline or amorphous, depending on the My content) copolymers, which possess unimodal molecular weight distributions as well as uniform compositions. Microstructural analysis of poly­(ethylene-co-My)­s by NMR spectroscopy revealed that the resultant copolymers possessed cyclopentane units with a My pendant arm (−CH2CHCMe2), formed by 2,1- or 1,4-My insertion and subsequent cyclization after ethylene insertion. The resultant copolymer showed promising elastic properties; the elongation at break increased upon increasing the My content, accompanied by a decrease in the tensile strength and toughness.
ISSN:0024-9297
1520-5835
DOI:10.1021/acs.macromol.1c01878