Random Copolymers Based on 2‐Ethylhexyl Acrylate Exhibit Unusual Glass Transition Breadth and Facile Autonomous Self‐Healing over a Broad Composition Range

Macromolecular Rapid Communications, Journal Year: 2024, Volume and Issue: 45(22)

Published: Aug. 16, 2024

Abstract Statistical copolymers are commercially important because their properties can be tuned by comonomer selection and composition. Rubbery‐state styrene (S)/ n ‐butyl acrylate (nBA) have previously been reported to exhibit facile, autonomous self‐healing over a narrow composition band (47/53 53/47 mol%). The need for is explained alternating sequences that accommodate interchain secondary bonding. It hypothesized achieve bonding without facile broad range. 2‐ethylhexyl (EHA) identified as yielding sequence‐independent interactions. For these interactions it tested experimentally glass transition breadth in rubbery‐state S/EHA copolymers, with S/n‐hexyl (nHA) S/nBA controls. ‐alkyl random enhanced breadths bands correspond self‐healing. In contrast, much greater than S/nHA at all compositions well of damage range full tensile‐property recovery, often 3–10 h. Characterization may serve simple screening tool identifying broad‐composition‐range, contribute polymer resilience sustainability.

Language: Английский

Large‐scale Conformational Changes of Diindole Functional Groups Driven by Cation‐π Interactions and the Toughening Mechanism of Thermosets

Macromolecular Rapid Communications, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 23, 2024

Abstract This is described that a new concept for the design of toughening supramolecular thermosets by incorporating diindole groups, which are functionalized via cation‐π interactions in covalently crosslinked networks. Large‐scale conformational changes functional groups could occur under external forces, endowing with excellent properties.

Language: Английский