Study on flame-retardant mechanism of polycarbonate containing sulfonate-silsesquioxane-fluoro retardants by TGA and FTIR

作者：Liu Shumei; Ye Hua; Zhou Yongsheng; He Jihui; Jiang Zhijie; Zhao Jianqing^*; Huang Xianbo

来源：Polymer Degradation and Stability, 2006, 91(8): 1808-1814.

DOI：10.1016/j.polymdegradstab.2005.11.013

• polycarbonate
• synergistic flame retardancy
• thermal degradation rate
• activation energy
• char structure

The flame retardancy of bisphenol A polycarbonate (PC) containing potassium diphenylsulfone sulfonate (KSS), poly(aminopropyl/phenyl-silsesquioxane) (PAPSQ) and poly(vinylidenefluoride) (PVDF) was measured by limited oxygen index (LOI) and examined according to UL94. A high LOI and UL94 V-0 rating for 1.6 mm thickness samples were obtained by a combined use of equivalent KSS, PAPSQ and PVDF at 0.1-0.3 wt% loading, respectively. The improvement in flame retardancy of PC compositions arose from the synergistic interaction of three additives. Thermogravimetric analysis (TGA) indicated that the combination decreased the activation energy (E) of PC degradation and elevated the thermal degradation rate of PC to ensure the formation of an insulating carbon layer. FTIR analysis showed that the LOI char of PC containing the three additives took on a highly cross-linking aromatic ester and ether structure.

• 出版日期2006-8
• 单位华南理工大学