期刊
POLYMER DEGRADATION AND STABILITY
卷 214, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2023.110389
关键词
Polycarbonate; Flame retardancy; Sulfonate; Flame-retardant mechanism
By synthesizing polycarbonate (PC) composites with 1,3-benzenedisulfonic acid dipotassium salt (KSP), the PC sample with only 0.01 wt% KSP exhibited superior flame retardant properties, reaching UL-94 V-0 rating while maintaining mechanical properties.
Polycarbonate (PC) is one of the major engineering plastics. For the flame retardant PC, there are still obstacles to the development of high performance thin-walled PC. 1,3-Benzenedisulfonic acid dipotassium salt (KSP) was successfully synthesized by the electrophilic reaction of octaphenylsilsesquioxane (OPS) with excess chlorosulfonic acid (ClSO3H), and the structure of KSP was characterized using Fourier-transform infrared (FTIR), nuclear magnetic resonance (NMR), and Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) measurements. PC/KSP composites with different KSP contents were prepared. It is obtained that the PC with only 0.01 wt% KSP exhibits superior flame retardant properties: the thin-walled PC (1.1 mm) sample reached UL-94 Vertical burn tests V-0 rating, the peak heat release rate (p-HRR) decreased by 16.2% and the limiting oxygen index (LOI) increased to 32.5%, while maintaining the mechanical properties. By analyzing the condensed-phase and gas-phase products during the thermal degradation of the PC/KSP composites, it is demonstrated that KSP can promote the early decomposition of PC into carbon and rapidly form a stable carbon layer to protect the internal substrate during combustion.
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