Real-time char layer resistance monitoring for the study of expanded char layer morphology formed by IFR/SBS during combustion processes

• DOI: 10.1016/j.polymertesting.2024.108385
• Publication Date: 2024-02-29T06:11:39Z
• Authors: Jiale Huo; Xiping Gao; Dahu Yao; Chang Lu; Yingzi Liu; Zhuoyan Yang
• Keywords: Intumescent; Layer by layer

Intumescent flame retardants (IFR) are used to improve the retardancy of polymers through formation an expanded char layer. However, there is no method that can be detect morphological evolution layer during combustion in real time. Flame ablation surface IFR retardant produces containing monomeric carbon, which makes electrically conductive. The expansion would lead corresponding changes its electrical resistance. Therefore, detecting real-time resistance provide feedback on process. Herein, a novel device was fabricated for burning process styrene-butadiene-styrene block copolymer (SBS). investigated by UL-94, LOI and cone calorimetry tests. mechanism using Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy Raman spectroscopy. morphology under different times scanning electron microscopy. charcoal tested samples with gas source contents. Combined morphology, it found could feed back layer's including continuity, density, rupture layers due excessive expansion.