Synthesis And Characterization Of A Novel Organic-inorganic Hybrid Mesoporous Materials And Its Flame Retardency Application In Polycarbonate/Acrylonitrile-Butadiene-Styrene

Polycarbonate/acrylonitrile-butadiene-styrene (PC/ABS), an engineering polymer alloy, has been widely applied in various fields such as automobile industry, electronic components, construction materials and so on. Organically functionalized hybrid mesoporous materials with well-ordered structure have unique mesoporous structure and rich surface reactivity, therefore it has great application potencial.In this thesis, a three-block copolymer P123 (PEO-PPO-PEO) was used as template to prepare vinyl-functionalized hybrid mesoporous materials with different molar content of vinyltriethoxysilane(VTES) precursor, then 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) was successfully grafted on. X-ray diffraction (XRD), transmission electron microscopy (TEM) and N2 sorption results shows the ordered structure of hybrid mesoporous silica materials is hexagonal P6mm symmetry. The BET surface area of HM and DM are 462.54 and 470.37 m2g-1, respectively, and the pore size are 3.79 and 3.82nm. The grafting of DOPO kept the structure of hybrid mesoporous materials intact without blocking the pores.DOPO-grafted hybrid mesoporous materials and triphenyl phosphate (TPP) was incorporated into PC/ABS. In PC/ABS/6wt%TPP/2wt%DM system, the flame retardancy of the composite improved significantly with 28% LOI value and V0 rating in UL-94 tests. TGA and cone calorimeter tests results showed DM is an excellent synergistic agent with TPP in PC/ABS in combustion which has promoting charring effect by increased char residual and reduced HRR and peak THR value. Raman spectra and SEM images also confirmed that the structures of PC/ABS/TPP/DM char residual are more compact which act as effective shield to protect the polymer matrix from heat.