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Toughening Rigid Epoxy Using Novel Potassium Silanolate Ionic Interactions
Author(s) -
Wu Xiao,
Yang Xin,
Zuo XiaoBiao,
Yu Ran,
Zhao XiaoJuan,
Zhang Ying,
Huang Wei
Publication year - 2020
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.201900535
Subject(s) - epoxy , ionic bonding , materials science , curing (chemistry) , toughness , composite material , toughening , dynamic mechanical analysis , small angle x ray scattering , glass transition , potassium , stiffening , modulus , scattering , chemical engineering , ion , polymer , chemistry , organic chemistry , physics , optics , metallurgy , engineering
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.