Turning Rubber into a Glass: Mechanical Reinforcement by Microphase Separation

Tress, Martin; Ge, Sirui; Xing, Kunyue; Cao, Peng-Fei; Saito, Tomonori; Genix, Anne-Caroline; Sokolov, Alexei P.

doi:10.1021/acsmacrolett.0c00778

Title: Turning Rubber into a Glass: Mechanical Reinforcement by Microphase Separation

Journal Article · Wed Jan 13 00:00:00 EST 2021 · ACS Macro Letters

DOI:https://doi.org/10.1021/acsmacrolett.0c00778· OSTI ID:1809980

^[1]; Ge, Sirui ^[1];

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^[2];

^[2]; Genix, Anne-Caroline ^[3];

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Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division
Université de Montpellier (France). Laboratoire Charles Coulomb (L2C)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division

Supramolecular associations provide a promising route to functional materials with properties such as self-healing, easy recyclability or extraordinary mechanical strength and toughness. The latter benefit especially from the transient character of the formed network, which enables dissipation of energy as well as regeneration of the internal structures. However, recent investigations revealed intrinsic limitations in the achievable mechanical enhancement. Here we present studies of a set of telechelic polymers with hydrogen-bonding chain ends exhibiting an extraordinarily high, almost glass-like, rubbery plateau. This is ascribed to the segregation of the associative ends into clusters and formation of an interfacial layer surrounding these clusters. An approach adopted from the field of polymer nanocomposites provides a quantitative description of the data and reveals the strongly altered mechanical properties of the polymer in the interfacial layer. These results demonstrate how employing phase separating dynamic bonds can lead to the creation of high-performance materials.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC05-00OR22725; DMR-1904657

OSTI ID:: 1809980

Journal Information:: ACS Macro Letters, Vol. 10, Issue 2; ISSN 2161-1653

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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