Special Inorganic Seminar

Seminar series
Inorganic Chemistry
When
Fri, Sep 27 3:00pm
Where
2033 YH
Speaker Professor Dongmei Cui
Changchun Institute of Applied Chemistry
Chinese Academy of Sciences
Description

Changchun Institute of Applied Chemistry, Chinese Academy of Sciences

 

Professor Dongmei Cui

Synthesis of Functional and Topological Polymers via Coordination Mechanism 

Abstract:

Luminescent materials have gained an upsurge in research interest in the past decades, however, the luminophores are only highly emissive in dilute solutions, and aggregations often cause partial or even complete quenching of the light emissions (ACQ). In contrast, the propeller-like small molecules show “aggregation-induced emission (AIE)” phenomenon and have been found many high-tech applications. By merit of their good capacity to be facilely fabricated into thin solid films, AIE acitive polymers have become the research target. To date, the mostly explored polymers with AIE characteristic are those bearing conjugated double or triple bonds synthesized by polymerization of the monomers modified by the AIE-active luminogens, or by attaching the polymers to the predesigned substrates bearing these units. Herein, we wish to report a novel and efficient strategy, named “AIE-active molecules mediated chain transfer polymerization”, which employs a rare-earth metal catalyst shuttling among the excess AIE-active compounds as the chain transfer agents (CTA) via fast-reversible exchange reaction, to initiate polymerizations. Polymer chains appear to grow from the CTA, thus, achieving extremely high catalyst productivity and incorporating the AIE-active units in situ into the obtained polymer chains at well-defined positions.

 

 

Professor Zhongbao Jian

Dual Strategy of Group 10 Metal Catalysts and Polar Monomers for New Polyolefin Architectures

Abstract:

Catalytic polymerizations of ethylene or propylene are amongst the largest scale synthetic chemical reactions performed today. By contrast, a coordination-insertion (co)polymerization of polar olefins remains a long-standing challenge. Significant breakthroughs were made with late transition-metal nickel and palladium (Group 10) catalysts to produce from highly linear to highly branched (functionalized) polyolefins over the past two decades. Fundamental limitations and problems of these reactions can be understood from their mechanism such as low molecular weight of copolymers due to the beta-hydride elimination, low catalytic activity due to the chelation of functional group, and low incorporation due to the slower insertion rate of comonomer. In this seminar, to address these issues we will present our recent strategies on developing both new nickel and palladium catalysts and well-designed functional comonomers. As a result, enhanced molecular weight polymers, increased catalytic activities and comonomer incorporations, and new polymer architectures including polyolefin elastomer, polyolefin lubricant oil, functionalized polyolefin were achieved.

 

 

 

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