Toughening Rigid Epoxy Using Novel Potassium Silanolate Ionic Interactions. Issue 2 (29th December 2019)

• Record Type: Journal Article
• Authors: Wu, Xiao; Yang, Xin; Zuo, Xiao‐Biao; Yu, Ran; Zhao, Xiao‐Juan; Zhang, Ying; Huang, Wei
• Is Part Of: Macromolecular materials and engineering. Volume 305:Issue 2(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-12-29
• Subjects: epoxy ionomer toughness -- ionic cluster -- multiplets -- stretchability; Plastics -- Periodicals; Polymers -- Periodicals; Polymerization -- Periodicals; 547.705
• DOI: 10.1002/mame.201900535
• Languages: English
• ISSNs: 1438-7492

Abstract

Abstract: A rigid and densely cross‐linked epoxy resin is successfully toughened by introducing novel potassium silanolate ionic interactions, exhibiting simultaneous improvement in toughness, strength, modulus, and glass transition temperature. The ionic interactions are incorporated through a simple way into epoxy cured with a novel potassium silanolate ionic groups‐containing amine curing agent. Small angle X‐ray scattering/wide angle X‐ray scattering and dynamic thermomechanical analysis results show that the ionic groups aggregated into multiplets and clusters in the prepared epoxy ionomers. The temporary physical cross‐link effect of ionic aggregates and the consequently formed chain‐restricting ionomeric nanodomains account for the stiffening and toughening performance. Furthermore, the densely cross‐linked epoxy ionomers possess high stretchability at elevated temperature (about 800% at 200 °C) due to the dynamic ion‐hopping effect. Abstract : Herein, a novel polysiloxane oligomer containing amine groups and potassium silanolate ionic interaction is synthesized and introduced into epoxy cured with amine to prepare a new high performance stiff epoxy ionomer in a simple way. The temporary physical cross‐link effect of ionic aggregates and the consequently formed chain‐restricting ionomeric nanodomains account for the stiffening and toughening performance.