Chinese Journal of Applied Chemistry ›› 2018, Vol. 35 ›› Issue (12): 1427-1433.DOI: 10.11944/j.issn.1000-0518.2018.12.180038

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Silica Grafted 9,10-Dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and Its Effect on Flame Retardancy and Transparency of Polymethyl Methacrylate Nanocomposites

WANG Dongshengab,WEN Xinb*(),LI Yunhuia*(),TANG Taob   

  1. aSchool of Chemistry and Environmental Engineering,Changchun University of Science and Technology,Changchun 130022,China
    bState Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China
  • Received:2018-02-07 Accepted:2018-05-25 Published:2018-12-05 Online:2018-12-05
  • Contact: WEN Xin,LI Yunhui
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.51773202, No.21204079)


Polymethyl methacrylate(PMMA) is one of important polymer materials with good transparency, but the poor flame retardancy of PMMA greatly limits its application. In this work, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide(DOPO) was grafted onto the surface of silica nanoparticles that were employed to prepare PMMA nanocomposites. The results from limiting oxygen index(LOI), vertical burning(UL-94) and cone calorimeter test(CCT) indicate that the modified silica can effectively improve the flame retardancy of PMMA, which is mainly attributed to the synergistic effect between nanoparticles and phosphorous flame retardant to form compact protective carbon layer. Meanwhile, similar to pure PMMA, the as-prepared PMMA nanocomposites keep good transparency, which is positive to the wide applications of PMMA with high demand of optical transparency.

Key words: polymethyl methacrylate, silica, dihydro-oxa-phosphaphenanthrene-oxide, flame retardancy, transparency