Repository logo

Infoscience

  • English
  • French
Log In
Logo EPFL, École polytechnique fédérale de Lausanne

Infoscience

  • English
  • French
Log In
  1. Home
  2. Academic and Research Output
  3. Journal articles
  4. Effect of thermal lag on glass transition temperature of polymers measured by DMA
 
Loading...
Thumbnail Image
research article

Effect of thermal lag on glass transition temperature of polymers measured by DMA

Sun, Wei  
•
Vassilopoulos, Anastasios P.  
•
Keller, Thomas  
2014
International Journal of Adhesion and Adhesives

This paper investigates the influence of thermal lag on the glass transition temperature of polymers measured under different heating rates during dynamic mechanical analysis (DMA). The E-modulus-temperature curves of a two-component epoxy adhesive and a pultruded glass fiber-reinforced polyester were measured by a DMA machine. Experimental results showed that two kinds of thermal lag result when the heating rate exceeds 0.5 degrees C/min: one between the specimen temperature and the thermocouple of the machine and the other along the length of the specimen. A finite volume model was developed in order to simulate the thermal environment inside the DMA chamber and validate the measured thermal lags. A numerical procedure was adopted to calculate the influence of the thermal gradient along the length of the specimen on the E-modulus-temperature curve. It was found that when the thermal lag effects are excluded, the E-modulus of a specimen decreases with increasing heating rates. This result contradicts reported results obtained using the experimentally derived E-modulus vs. temperature curves, disregarding the influence of the thermal lags, and thus claiming an increase of the E-modulus with increasing heating rates. (C) 2014 Elsevier Ltd. All rights reserved.

  • Details
  • Metrics
Type
research article
DOI
10.1016/j.ijadhadh.2014.03.009
Web of Science ID

WOS:000337652800005

Author(s)
Sun, Wei  
•
Vassilopoulos, Anastasios P.  
•
Keller, Thomas  
Date Issued

2014

Publisher

Elsevier

Published in
International Journal of Adhesion and Adhesives
Volume

52

Start page

31

End page

39

Subjects

Dynamic mechanical analysis

•

E-modulus

•

Glass transition temperature

•

Heating rates

•

Heat transfer

•

Thermal gradient

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
CCLAB  
Available on Infoscience
August 29, 2014
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/106385
Logo EPFL, École polytechnique fédérale de Lausanne
  • Contact
  • infoscience@epfl.ch

  • Follow us on Facebook
  • Follow us on Instagram
  • Follow us on LinkedIn
  • Follow us on X
  • Follow us on Youtube
AccessibilityLegal noticePrivacy policyCookie settingsEnd User AgreementGet helpFeedback

Infoscience is a service managed and provided by the Library and IT Services of EPFL. © EPFL, tous droits réservés