Constructing flame retardant silica nanoparticles through styrene maleic anhydride copolymer grafting for PC/ABS composites
writer：Jingfan Zhang
keywords：Polymer-matrix composites (PMCs)，Interface/interphase，Mechanical properties，F(xiàn)lame retardancy，Selective dispersion
source：期刊
Issue time：2023年
Organic-inorganic hybrid particles have been prepared by grafting styrene maleic anhydride copolymer (SMA) onto reactive amino-modified silica nanoparticles. The SMA modified SiO2 (SMA-SiO2) was incorporated into polycarbonate (PC)/acrylonitrile-butadiene-styrene (ABS) composites (4:1, wt%/wt%) with bisphenol A bis (diphenyl phosphate) (BDP) to simultaneously improve the mechanical properties and flame retardancy. The mechanical properties of the sample containing SMA-SiO2 are apparently improved compared with that of samples containing unmodified SiO2. It is found that SMA-SiO2 tends to distribute at the phase interface of PC/ABS, and therefore improves the compatibility between PC and ABS. Besides, the peak of heat release rate (PHRR) and the total smoke production (TSP) of the PC/ABS composites are decreased by the presence
of SMA-SiO2. It is suggested that SMA-SiO2 can form a flame retarding shell at the phase interface to protect ABS. In summary, both the mechanical properties and flame retardancy of
PC/ABS composites are significantly improved due to the selective distribution of SMA-SiO2.
將苯乙烯-馬來酸酐共聚物（SMA）接枝到反應(yīng)性氨基改性的二氧化硅納米粒子上，制備了有機-無機雜化粒子。將SMA改性的SiO2（SMA-SiO2）摻入聚碳酸酯（PC）/丙烯腈-丁二烯-苯乙烯（ABS）復(fù)合材料（4:1，wt%/wt%）和雙酚A雙（磷酸二苯酯）（BDP）中，以同時提高力學(xué)性能和阻燃性。與含有未改性SiO2的樣品相比，含有SMA-SiO2的樣品的機械性能明顯改善。研究發(fā)現(xiàn)，SMA-SiO2傾向于分布在PC/ABS的相界面，從而提高了PC與ABS的相容性。此外，SMA-SiO2的存在降低了PC/ABS復(fù)合材料的熱釋放速率峰值（PHRR）和總發(fā)煙量（TSP）。結(jié)果表明，SMA-SiO2可以在相界面形成一個阻燃殼來保護ABS。總之，由于SMA-SiO2的選擇性分布，PC/ABS復(fù)合材料的力學(xué)性能和阻燃性都得到了顯著改善。