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High Performance Polymers
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Article

Accelerated Hygrothermal and UV Aging of Thermoplastic Polyurethanes

Rabindra N. Jana1* and H. Bhunia2

1 Centre for Materials Science and Engineering, Department of Mechanical Engineering, Tuskegee University, Alabama, USA
2 Department of Chemical Engineering, Thapar University, Patiala, Punjab, India

* To whom correspondence should be addressed.


  Abstract

Thermoplastic polyurethanes (PU) were prepared from 4,4'-diphenyl methane diisocyanate (MDI), polyether polyol and 1,4 butane diol with and without a hindered amine light stabilizer (Tinuvin®-123) and UV absorber (Tinuvin®-400). The accelerated hygrothermal and UV aging were performed at different humidity and aging temperatures for 720, 1440, and 2160 h of exposure, in a Thermotron environmental chamber and QUV chamber, respectively. Fourier transform infrared spectroscopy was used to evaluate the structural changes during aging. The thermal transition for PU, studied by differential scanning calorimetry showed a marginal structural damage after hygrothermal aging. After only 720 h of UV exposure, the neat PU showed a noticeable change in the chemical structure; however, the stabilized one showed almost no change. Tensile strength for the neat PU deteriorated by about 47% after 2160 h of UV exposure; however, the stabilized polyurethane maintained its almost original strength (i.e., 83% retention) after the whole exposure time. The acceleration factor was found to be 6 and the predicted life time for the stabilized polyurethane was about 6 years.

Key Words: Thermoplastic polyurethane, hindered amine light stabilizer (HALS), UV absorber, hygrothermal aging

First published on November 28, 2008
High Performance Polymers 2008, doi:10.1177/0954008308097460
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