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  4. Time-temperature dependence of thermomechanical recovery of cold-curing structural adhesives
 
research article

Time-temperature dependence of thermomechanical recovery of cold-curing structural adhesives

Moussa, Omar  
•
Vassilopoulos, Anastasios P.  
•
de Castro, Julia  
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2012
International Journal of Adhesion and Adhesives

The thermomechanical recovery behavior of a commercial cold-curing structural epoxy adhesive was investigated. Exposing the adhesive to temperatures above the glass transition temperature T-g significantly increased the latter although the curing degree increased only marginally. Cooling the adhesive from temperatures above T-g to temperatures below T-g led to full recovery of the mechanical properties (tensile stiffness and strength). The secondary bonds between the polymer chains fully reformed after cooling. Temporarily exceeding the T-g did not therefore result in any degradation of the material-on the contrary, the mechanical properties significantly improved due to post-curing. Simulating temperature fluctuations by eight consecutive cycles across glass transition also improved the mechanical properties and did not lead to any degradation. An existing model for predicting temperature-dependent mechanical properties was extended to also describe the recovery behavior. The simulations agreed well with the experimental results. (C) 2012 Elsevier Ltd. All rights reserved.

  • Details
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Type
research article
DOI
10.1016/j.ijadhadh.2012.02.005
Web of Science ID

WOS:000304580300013

Author(s)
Moussa, Omar  
Vassilopoulos, Anastasios P.  
de Castro, Julia  
Keller, Thomas  
Date Issued

2012

Published in
International Journal of Adhesion and Adhesives
Volume

35

Start page

94

End page

101

Subjects

Cold-curing structural adhesives

•

Mechanical properties

•

Epoxy resin

•

Dsc

•

Curing degree

•

Glass transition temperature

•

Transition-Temperatures

•

Mechanical-Properties

•

Internal-Stress

•

Composites

•

Polymers

•

Behavior

•

Shear

•

Cure

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
CCLAB  
Available on Infoscience
June 15, 2012
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/81900
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