In-situ investigation of temperature evolution of drippings via an optimized UL-94 instrumentation: Application to flame retarded polybutylene succinate

Publication date: Available online 17 July 2018Source: Polymer Degradation and StabilityAuthor(s): Chi Hu, Gaëlle Fontaine, Pauline Tranchard, Thierry Delaunay, Marion Collinet, Sophie Marcille, Serge BourbigotAbstractIncorporation of 10 wt% 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) in polybutylene succinate (PBS) showed a significant improvement of fire behavior at the UL-94 test (3.2 mm): (i) V-0 rating and no ignition of the bar for PBS/DOPO with dripping but with no ignition of the cotton whereas (ii) no classification for neat PBS with dripping and with ignition of the cotton. To fully understand these two different phenomena, an optimized UL-94 instrumentation was developed. Thermocouples embedded in the bar measures heat gradient and infrared (IR) camera equipped with a specific filter permits estimating heat gradient in the bar and surface temperature of the falling drop respectively. The main advantage of this optimized designed UL-94 instrumentation is to get measurement in situ and in dynamic. For the first time, this instrumentation has successfully captured the temperature evolution of a falling drop during a UL-94 test. It was shown that the drops of neat PBS exhibits a constant temperature of 453 ± 10 °C when detaching the bar. However the drops' temperature of PBS/DOPO varied during the UL-94 test when they detach the bar: the drops formed at around 403 ± 10 °C at the end of the first ignition, whereas at the end of second ...

Source: Polymer Degradation and Stability - July 18, 2018 Category: Chemistry Source Type: research