Preparation, Characterization, Flame Retardance and Properties of Novel Halogen-free Expandable Graphite /PMMA Composites containing Silica by Sol-Gel Method

摘要

In this investigation, silane was grafted on expandable graphite in a free-radical reaction. The modified expandable graphite had an -OEt function group that reacted with MMA-co-MSMA. Expandable graphite was functionalized using a coupling agent to produce covalent bonds between the organic and inorganic phases, enhancing the thermal stability of the composites. FTIR and XPS were adopted to characterize the grafting reaction between VIES and EG TGA and TGA were employed to calculate the thermal stability. SEM was utilized to observe the morphology of the composites and the behavior of expansion was discussed after the materials were burned. The results reveal that functionalized EG can improve the thermal stability of composites.