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

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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

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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