writer：Jingfan Zhang
keywords：Polymer-matrix composites (PMCs)，Interface/interphase，Mechanical properties，Flame 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.

将苯乙烯-马来酸酐共聚物（SMA）接枝到反应性氨基改性的二氧化硅纳米粒子上，制备了有机-无机杂化粒子。将SMA改性的SiO₂（SMA-SiO₂）掺入聚碳酸酯（PC）/丙烯腈-丁二烯-苯乙烯（ABS）复合材料（4:1，wt%/wt%）和双酚A双（磷酸二苯酯）（BDP）中，以同时提高力学性能和阻燃性。与含有未改性SiO₂的样品相比，含有SMA-SiO₂的样品的机械性能明显改善。研究发现，SMA-SiO₂倾向于分布在PC/ABS的相界面，从而提高了PC与ABS的相容性。此外，SMA-SiO₂的存在降低了PC/ABS复合材料的热释放速率峰值（PHRR）和总发烟量（TSP）。结果表明，SMA-SiO₂可以在相界面形成一个阻燃壳来保护ABS。总之，由于SMA-SiO₂的选择性分布，PC/ABS复合材料的力学性能和阻燃性都得到了显著改善。