本研究是利用四級銨鹽所改質之奈米雲母(Nano Mica)與兩種不同粒徑之可膨脹石墨(Expandable Graphite, EG),配置各種含量的兩種粉體,加入至甲基丙烯酸甲酯(MMA)單體中進行PMMA聚合,經由熱壓成型加工後所得之PMMA/EG/Mica複合材料,實施阻燃及各類物理與化學性質測試。 經由阻燃測試結果發現,可膨脹石墨之阻燃性能優異,不需大量添加即可有不錯之阻燃效果;而在相同石墨粒徑及含量下,添加奈米雲母之複合材料,可有效提升其阻燃性能,其中又以添加20wt%含量之大粒徑石墨與5wt%奈米雲母之樣本,其效果最為顯著,將純PMMA之L.O.I值由16提升至28。 本研究另藉由FT-IR來檢測PMMA/EG/Mica複合材料化學性質之改變、以同心圓高電阻係數測試儀檢測複合材料之表面電阻係數、以材料試驗機進行壓縮強度測試、並進一步對其做掃描式電子顯微鏡(SEM)之表面結構觀測及DSC熱性質分析。
Ammonium salt was used to modify the nano mica and expandable graphite powder (EG) with the different particle sizes in this study. Furthermore, EG and mica were added into Methyl Methacrylate (MMA) to synthesize PMMA/EG/mica composites. The compression molding was used to fabricate the PMMA/EG/mica composites and carry on the various test of physical and chemical properties. Through the flame retardant testing results showed that PMMA/EG/mica composites with the same particle size and loadings have the better flame retardant performance. However, the composites with larger particle size EG have significant performance. Otherwise, the chemical properties variation was tested by FT-IR. Finally, the surface morphology of PMMA/EG/mica composites was observed by SEM and thermal properties analysis was used by DSC instrument.