The ceramifying process and mechanical properties of silicone rubber/ ammonium polyphosphate/ aluminium hydroxide/ mica composites

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• 作者：Sheng Hu^a ; ^b ; Fei Chen^a ; Jun-Guo Li^a ; Qiang Shen^a ; ^{sqqf@263.net" class="auth_mail" title="E-mail the corresponding author} ; Zhi-Xiong Huang^a ; Lian-Meng Zhang^a
• 关键词：Ceramifying process ; Silicone rubber ; Ammonium polyphosphate ; Aluminium hydroxide ; Mica ; Thermal degradation ; Mechanical properties
• 刊名：Polymer Degradation and Stability
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：126
• 期：Complete
• 页码：196-203
• 全文大小：1922 K

文摘

The ceramifying process and mechanical properties of silicone rubber/ammonium polyphosphate/aluminium hydroxide/mica composites (hereinafter referred to as SRAAM) are investigated. The changes in microstructures and phase compositions of SRAAM during ceramifying process at different calcined temperatures are studied. At 300 °C, SRAAM residues exhibit porous structure due to gas evolution from the thermal decomposition of APP, Al(OH)₃ and silicone rubber, but mica does not react with them. Although the flexural strength of SRAAM residues are low, the generation of aluminium phosphate (AlPO₄) and NH₄AlP₂O₇ improves the self-supporting. With no new phase generated, SRAAM residues maintain certain degree flexural strength due to the adhesive effection of aluminium phosphate during 300–600 °C. The reactivity of mica is increased by eliminating hydroxyl at temperature up to 800 °C, and then the chemically interactions between active mica and phosphates are able to generate Al₂O₃·2SiO₂, and KAlP₂O₇ compounds improving the flexural strength. Further reactions between mica and KAlP₂O₇ could generate KAlSi₃O₈ at 1000 °C and the density of residual product is improved by low melting point phosphate filling pore to form relatively dense structure increasing the flexural strength. SRAAM with high flexural strength and good self-supporting from low to high temperatures is expected to be a kind of excellent ceramifying performance of flame retardant materials.