cis‐1,4‐Selective Copolymerization of Ethylene and Butadiene: A Compromise between Two Mechanisms
Abstract
Introducing ethylene units into polybutadiene backbones is an approach to synthesize advanced rubber materials, which has been a research challenge because of distinct polymerization mechanisms of the two monomers. To date, only trans‐1,4‐ and 1,2‐regulated copolymers have been obtained. Herein, we reported the unprecedented cis‐1,4 selective copolymerization of ethylene and butadiene by using the thiophene‐fused cyclopentadienyl‐ligated scandium complexes. The effects of the sterics and electronics of the catalytic precursors as well as the monomer loading mode on the activity and selectivity as well as the sequence lengths were investigated, and the mechanism was elucidated. Thus a novel ethylene‐based rubber material possessing a high molecular weight, 80 % cis‐1,4 regularity and a Tg=−94 °C without an obvious melting point owing to short polyethylene sequences even at its content up to 45 mol %, was isolated. This new rubber material exhibited excellent anti‐flowing performance and strong tensile strength.
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- Authors
- Wu, C., Liu, B., Lin, F., Wang, M., & Cui, D.
- Affiliations
- Chinese Academy of Sciences (CN)
- Corresponding author
- Cui, Dongmei
- Venue
- Angewandte Chemie International Edition
- Publisher
- Wiley
- Published
- 2017-05-04
- Volume
- 56
- Issue
- 24
- Pages
- 6975-6979
- ISSN
- 1433-7851 (ISSN-L)
- 1521-3773
- OpenAlex
- W2611816416
- Cited by
- 67
- References
- 43
- Citations by year
- 2026: 4 · 2025: 11 · 2024: 11 · 2023: 9 · 2022: 4 · 2021: 8 · 2020: 6 · 2019: 8 · 2018: 3 · 2017: 3
- FWCI
- 2.28
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Angewandte Chemie International Edition (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Natural Science Foundation of China (21634007, 51673184, 21374112, 21644010)
- Topics
- Physical Sciences › Chemistry › Organic Chemistry › Organometallic Complex Synthesis and Catalysis
- Physical Sciences › Chemistry › Organic Chemistry › Advanced Polymer Synthesis and Characterization
- Physical Sciences › Materials Science › Biomaterials › biodegradable polymer synthesis and properties
- Keywords
- cis-1,4 selectivity, polybutadiene, scandium complexes, polymerization mechanism, sequence length, glass transition temperature, tensile strength
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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