Quadruple Hydrogen Bond-Containing A-AB-A Triblock Copolymers: Probing the Influence of Hydrogen Bonding in the Central Block

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dc.contributor.authorLiu, Boeren
dc.contributor.authorChen, Xien
dc.contributor.authorSpiering, Glenn A.en
dc.contributor.authorMoore, Robert Bowenen
dc.contributor.authorLong, Timothy E.en
dc.contributor.departmentChemistryen
dc.contributor.departmentMacromolecules Innovation Instituteen
dc.date.accessioned2021-08-09T16:52:54Zen
dc.date.available2021-08-09T16:52:54Zen
dc.date.issued2021-08-03en
dc.date.updated2021-08-06T15:20:55Zen
dc.description.abstractThis work reveals the influence of pendant hydrogen bonding strength and distribution on self-assembly and the resulting thermomechanical properties of A-AB-A triblock copolymers. Reversible addition-fragmentation chain transfer polymerization afforded a library of A-AB-A acrylic triblock copolymers, wherein the A unit contained cytosine acrylate (CyA) or post-functionalized ureido cytosine acrylate (UCyA) and the B unit consisted of <i>n</i>-butyl acrylate (<i>n</i>BA). Differential scanning calorimetry revealed two glass transition temperatures, suggesting microphase-separation in the A-AB-A triblock copolymers. Thermomechanical and morphological analysis revealed the effects of hydrogen bonding distribution and strength on the self-assembly and microphase-separated morphology. Dynamic mechanical analysis showed multiple tan delta (δ) transitions that correlated to chain relaxation and hydrogen bonding dissociation, further confirming the microphase-separated structure. In addition, UCyA triblock copolymers possessed an extended modulus plateau versus temperature compared to the CyA analogs due to the stronger association of quadruple hydrogen bonding. CyA triblock copolymers exhibited a cylindrical microphase-separated morphology according to small-angle X-ray scattering. In contrast, UCyA triblock copolymers lacked long-range ordering due to hydrogen bonding induced phase mixing. The incorporation of UCyA into the soft central block resulted in improved tensile strength, extensibility, and toughness compared to the AB random copolymer and A-B-A triblock copolymer comparisons. This study provides insight into the structure-property relationships of A-AB-A supramolecular triblock copolymers that result from tunable association strengths.en
dc.description.versionPublished versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationLiu, B.; Chen, X.; Spiering, G.A.; Moore, R.B.; Long, T.E. Quadruple Hydrogen Bond-Containing A-AB-A Triblock Copolymers: Probing the Influence of Hydrogen Bonding in the Central Block. Molecules 2021, 26, 4705.en
dc.identifier.doihttps://doi.org/10.3390/molecules26154705en
dc.identifier.urihttp://hdl.handle.net/10919/104604en
dc.language.isoenen
dc.publisherMDPIen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectquadruple hydrogen bondingen
dc.subjectacrylic thermoplastic elastomeren
dc.subjectsupramolecular polymeren
dc.subjectmicrophase separationen
dc.titleQuadruple Hydrogen Bond-Containing A-AB-A Triblock Copolymers: Probing the Influence of Hydrogen Bonding in the Central Blocken
dc.title.serialMoleculesen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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