Record number :
Title of article :
Confirmation of the healing mechanism in a mendable EMAA–epoxy resin
Author/Authors :
Samuel Meure، نويسنده , , Russell J. Varley، نويسنده , , Dong Yang Wu، نويسنده , , Sherri Mayo، نويسنده , , Kate Nairn، نويسنده , , Scott Furman، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2012
Pages :
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Abstract :
The healing of a mendable epoxy resin containing polyethylene-co-methacrylic acid (EMAA) particles has been confirmed to occur via a pressure delivery mechanism of the healing agent, EMAA, into a crack plane during thermal activation. Internal pressure rises within a bubble, formed from interactions between EMAA particles causing expansion of the bubble which subsequently force the healing agent to flow into an available cavity. The use of X-ray ultra-microscopy (Xum), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) provides evidence for volatile formation, bubble expansion and delivery of healing agent. Spectroscopic studies of the interfacial reactions between epoxy and EMAA during post-cure, compared with adhesion and fracture toughness measurements, reveal that hydroxyl acid reactions catalysed via tertiary amine initiate the pressure delivery mechanism. Furthermore, adhesion and FTIR measurements suggest that the re-binding or healing of a crack interface is likely to be dominated by hydrogen bonding.
Keywords :
Polymers , Healing , fracture , Toughness
Journal title :
European Polymer Journal(EPJ)
Link To Document :