Incorporation 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 UL-94 instrumentation is to get measurement in situ and in dynamic. 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 ignition they detach the bar at about 313 ± 15 °C. Neat PBS exhibited temperature at least 50 °C higher than PBS/DOPO when the drops touched the cotton: 435 ± 5 °C for neat PBS at the end of first ignition vs. 385 ± 10 °C for the PBS/DOPO at the end of first ignition vs. 295 ± 15 °C for the PBS/DOPO at the end of second ignition. This can explain why the drops of PBS can ignite the cotton whereas those of PBS/DOPO cannot. Additionally, IR camera images indicate the change of rheology by incorporation of DOPO into PBS. A measurement of viscosity by the rheometer showed that PBS/DOPO has lower viscosity than neat PBS.

掺入10  wt在UL-94试验（3.2 mm）中，聚丁二酸丁二酯（PBS）中的％9,10-二氢-9-氧杂-10-菲苯并菲-10-氧化物（DOPO）显示出明显的防火性能：（i）V-等级为0，对于PBS / DOPO，滴下没有点燃，但是没有点燃棉花，而（ii）对于纯PBS，没有滴下并且点燃了棉花没有分类。为了完全理解这两种不同的现象，开发了一种优化的UL-94仪器。嵌入在棒中的热电偶可测量热梯度，而配备有特定滤镜的红外（IR）摄像机可分别估算棒中的热梯度和下降液滴的表面温度。这种经过优化的UL-94仪器的主要优点是可以现场进行动态测量。该仪器已成功捕获了UL-94测试期间滴落的温度演变。结果表明，分离棒时，纯净的PBS液滴表现出453±10°C的恒定温度。但是，PBS / DOPO的液滴温度在断开棒时在UL-94测试期间发生了变化：液滴在第一次点火结束时约403±10°C时形成，而在第二次点火结束时它们却脱离了温度。压力约为313±15°C。当水滴接触棉花时，纯净的PBS的温度至少比PBS / DOPO高出50°C：第一次点火结束时，纯净的PBS的温度为435±5°C PBS / DOPO的温度在UL-94测试期间会脱离杆而变化：液滴在第一次点火结束时在403±10°C左右形成，而在第二次点火结束时，液滴在313处脱离了杆±15°C。当水滴接触棉花时，纯净的PBS的温度至少比PBS / DOPO高出50°C：第一次点火结束时，纯净的PBS的温度为435±5°C PBS / DOPO的温度在UL-94测试期间会脱离杆而变化：液滴在第一次点火结束时在403±10°C左右形成，而在第二次点火结束时，液滴在313处脱离了杆±15°C。当水滴接触棉花时，纯净的PBS的温度至少比PBS / DOPO高出50°C：第一次点火结束时，纯净的PBS的温度为435±5°C与第一次点火结束时PBS / DOPO的385±10°C相比，第二次点火结束时PBS / DOPO的295±15°C。这可以解释为什么PBS的液滴可以点燃棉花，而PBS / DOPO的液滴不能点燃棉花。此外，红外热像仪图像通过将DOPO掺入PBS来指示流变学的变化。用流变仪测量粘度表明，PBS / DOPO的粘度低于纯PBS。