Surface microencapsulation modification of aluminum hypophosphite and improved flame retardancy and mechanical properties of flame-retardant acrylonitrile–butadiene–styrene composites
Surface microencapsulation modification of aluminum hypophosphite and improved flame retardancy and mechanical properties of flame-retardant acrylonitrile–butadiene–styrene composites
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DOI：
10.1039/c5ra02308d
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发表时间：
2015-06
期刊：
影响因子：
3.9
通讯作者：
Ningjing Wu;Z. Xiu
中科院分区：
文献类型：
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作者：
Ningjing Wu;Z. Xiu
采用N-（β-氨基乙基）-γ-氨基丙基甲基二甲氧基硅烷缩聚法制备了表面微胶囊化次磷酸铝（SiAHP）。由于SiAHP微胶囊化改善了SiAHP与ABS基体的相容性，ABS/SiAHP复合材料的缺口冲击强度较ABS/AHP复合材料显著提高，且SiAHP含量仅为22.0%的ABS复合材料的垂直燃烧率达到V-0。锥形量热计测试表明，ABS/22 wt% SiAHP复合材料的峰值放热率（PHRR）和峰值产烟率（PSPR）值分别比ABS/22 wt% AHP复合材料降低了81.1%和49.5%。ABS/SiAHP复合材料的总放热量（THR）和总产烟量（TSR）均低于ABS/AHP复合材料。上述结果表明，硅酮微胶囊化改性SiAHP不仅提高了FR ABS/SiAHP复合材料的阻燃效率，而且有效地抑制了ABS的产烟率。通过对ABS/AHP和ABS/SiAHP复合材料残渣的数码照片和扫描电镜图像进行对比，发现ABS/SiAHP复合材料残渣的表面炭层结构更致密、更致密与ABS/AHP复合材料相比，能量色散x射线能谱（EDS）测量表明，与AHP相比，SiAHP更有效地促进了FR - ABS复合材料表面的碳生成。含有C和Si的三维致密炭层网络有效地提高了ABS/SiAHP复合材料的阻燃性。因此，ABS/SiAHP复合材料的阻燃性更多地归因于凝聚相机制，而不是ABS/AHP复合材料的阻燃性。
Surface microencapsulated aluminum hypophosphite (SiAHP) was successfully prepared via the condensation polymerization of N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane. The notched impact strength of the ABS/SiAHP composites was significantly enhanced compared to the corresponding ABS/AHP composites because the microencapsulated SiAHP improved the compatibility of SiAHP and the ABS matrix, and the vertical burning rate of the ABS composite with only 22.0 wt% SiAHP achieved V-0. The cone calorimeter tests demonstrated that the peak heat release rate (PHRR) and peak smoke production rate (PSPR) values of the ABS/22 wt% SiAHP composite were decreased by 81.1% and 49.5%, respectively, compared to those of the ABS/22 wt% AHP composite. Moreover, the total heat release (THR) and the total smoke production (TSR) values of the ABS/SiAHP composites were all lower than those of the ABS/AHP composites. These results clearly indicated that the silicone microencapsulation modification of SiAHP not only enhanced the flame retardancy efficiency of the FR ABS/SiAHP composite but also effectively restrained the smoke production rate of the ABS. A comparison of digital photographs and SEM images of the residues of the ABS/AHP and ABS/SiAHP composites after the cone calorimeter tests revealed that the residue of the ABS/SiAHP composites exhibited a denser and more compact surface char layer structure than that of the ABS/AHP composite. Energy-dispersive X-ray spectroscopy (EDS) measurement indicated that SiAHP more effectively promoted the carbon formation in the FR ABS composite at the surface compared to AHP. The three-dimensional compact char layer network containing C and Si effectively improved the flame retardancy of the ABS/SiAHP composite. Therefore, the flame retardancy of the ABS/SiAHP composite was attributed more to condensed-phase mechanisms than the flame retardancy of the ABS/AHP composite.