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    Topologically Precise and Discrete Bottlebrush Polymers: Synthesis, Characterization, and Structure-Property Relationships

    Year: 2022

    Journal: JACS Au, Volume 2, APR 25, page 898–905

    Authors: Ogbonna, Nduka D.; Dearman, Michael; Cho, Cheng-Ta; Bharti, Bhuvnesh; Peters, Andrew J.; Lawrence, Jimmy

    Organizations: Louisiana Board of Regents funding [RD-A-07, RD-A-18]; American Chemical Society Petroleum Research Fund [62656-DN17]; BASF Living Sustainability Laboratory Program; NSF-CAREER [CBET-1943986]

    Keywords: polymerization kinetics; precision bottlebrush polymers; glass transition temperature; discrete macromonomer; discrete bottlebrushes

    As the complexity of polymer structure grows, so do the challenges for developing an accurate understanding of their structure-property relationships. Here, the synthesis of bottlebrush polymers with topologically precise and fully discrete structures is reported. A key feature of the strategy is the synthesis of discrete macromonomer libraries for their polymerization into topologically precise bottlebrushes that can be separated into discrete bottlebrushes (D = 1.0). As the system becomes more discrete, packing efficiency increases, distinct three-phase Langmuir-Blodgett isotherms are observed, and its glass transition temperature becomes responsive to side-chain sequence. Overall, this work presents a versatile strategy to access a range of precision bottlebrush polymers and unravels the impact of side-chain topology on their macroscopic properties. Precise control over side chains opens a pathway for tailoring polymer properties without changing their chemical makeup.
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