Citation: Xuan Song, Teng Fu, Yajie Yang, Yahan Kuang, Xiuli Wang, Yu-Zhong Wang. Spatial-confinement combustion strategy enabling free radicals chemiluminescence direct-measurement in flame-retardant mechanism[J]. Chinese Chemical Letters, ;2025, 36(5): 110699. doi: 10.1016/j.cclet.2024.110699 shu

Spatial-confinement combustion strategy enabling free radicals chemiluminescence direct-measurement in flame-retardant mechanism

The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials (MoE), National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu 610065, China

futeng@scu.edu.cn

yzwang@scu.edu.cn

Received Date: 29 July 2024
Revised Date: 25 November 2024
Accepted Date: 28 November 2024
Available Online: 29 November 2024

Figures(3)

Generally, gaining fundamental insights into chain processes during the combustion of flame-retardant polymers relies on the qualitative and quantitative characterization of key chain carriers. However, polymer combustion processes based on conventional solid-fuel combustion strategies, due to the high coupling of pyrolysis, combustion, soot formation and oxidation, exhibit relatively high complexity and poor flame stability, and lead to a huge obstacle to the use of optical diagnostics. Herein, a spatial-confinement combustion strategy, which can produce a special staged flame with multi-jets secondary wave, is devised to provide a highly decoupled combustion environment. Glowing soot particles are therefore decoupled from main chemiluminescence region and confined to the flame tip to provide a well-controlled, optical-thin test environment for combustion diagnostic. Based on this strategy, a multi-nozzle-separation (MNS) burner is designed and fabricated, and the combustion processes associated with four model compounds, PVC, PS, PP/TBBA blends and PP/RP blends are investigated by spontaneous spectral diagnosis, and the chemiluminescence fingerprint of key diatomic/triatomic intermediates (such as OH, CH, C₂, ClO, Br₂, and PHO) are clearly observed. This encouraging result means that the strategy of spatial-confinement combustion we proposed shows promising prospect in many subjects associated with combustion chain regulation, such as efficient design of flame retardants.
- Polymer combustion,
- Chain reaction,
- Radical chemiluminescence fingerprints,
- Flame separation,
- Flame retardant mechanism
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