Abstract
The temperature dependence of a polymerbased time temperature indicator (TTI) was investigated to determine the Arrhenius activation energy (Ea). Threshold temperature sensors were created by incorporating small amounts (1.0–2.0, w/w) of photoluminescent 4,4′-bis(2-benzoxazolyl)stilbene chromophores (BBS) into commercial grade copolymers of ethylene and norborene TOPAS 5013. The blends were melted and molded using a twin-screw extruder and a heating press. After the melting process, the blends were quenched in an ice water bath and the resulting films kinetically trapped the dyes in dispersed states. The polymer glass transition temperature (Tg) leads to irreversible phase separation and aggregation of dye, resulting in a permanent and clear change of film color. The temperature-dependent color change of TOPAS 5013 and BBS films were measured using a color difference meter at the TOPAS 5013 Tg (134°C). We investigated Arrhenius type kinetic modeling of the temperature-dependent color change such as activation energies of TTIs.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
