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首页> 美国卫生研究院文献>Polymers >Estimation of Mechanical Performance Thermal Stability and Flame Retardancy of High-Impact Polystyrene/Surface-Modified APP/Carboxylic-Functionalized MWCNTs Nanocomposites
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Estimation of Mechanical Performance Thermal Stability and Flame Retardancy of High-Impact Polystyrene/Surface-Modified APP/Carboxylic-Functionalized MWCNTs Nanocomposites

机译：高抗冲聚苯乙烯/表面改性的APP /羧基官能化的MWCNTs纳米复合材料的机械性能热稳定性和阻燃性评估

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摘要

An ammonium polyphosphate (APP) surface-modified by silane coupling agent was used as flame retardant in high-impact polystyrene (HIPS). A series of HIPS nanocomposites containing different mass fractions of APP (k-APP) surface-modified by silane coupling agent (3-aminopropyl triethoxysilane, KH 550) and carboxylic-functionalized MWCNTs (COOH–MWCNTs) were prepared by the melt blending method. A composite only containing APP was also prepared as a reference material. Scanning electron microscopy (SEM) was employed to investigate the dispersion of the fillers into the HIPS matrix, and it was found the hydrophobic groups on the k-APP surface would greatly enhance the dispersion and prevent agglomerations compared with APP. Furthermore, the COOH–MWCNTs also showed good dispersibility into the matrix. Mechanical tests of the nanocomposites revealed that k-APP exhibits a more beneficial effect on both tensile and flexural properties compared with APP. Thermogravimetric analysis (TGA) and cone calorimeter tests (CCT) were conducted to probe the thermal and flammability properties of the nanocomposites, respectively. The synergistic effects of k-APP and COOH–MWCNTs on mechanical, thermal and flammability properties were examined as well.
机译：经硅烷偶联剂表面改性的聚磷酸铵（APP）被用作高抗冲聚苯乙烯（HIPS）中的阻燃剂。通过熔融共混法制备了一系列含有不同质量分数的经硅烷偶联剂（3-氨基丙基三乙氧基硅烷，KH 550）和羧基官能化的MWCNT（COOH-MWCNT）表面改性的APP（k-APP）的HIPS纳米复合材料。还制备仅包含APP的复合材料作为参考材料。用扫描电子显微镜（SEM）研究了填料在HIPS基体中的分散性，发现与APP相比，k-APP表面的疏水基团将大大增强分散性并防止团聚。此外，COOH-MWCNT也显示出良好的分散性。纳米复合材料的机械测试表明，与APP相比，k-APP对拉伸和弯曲性能均显示出更有利的影响。进行了热重分析（TGA）和锥形量热仪测试（CCT），以分别探测纳米复合材料的热性能和可燃性。还检查了k-APP和COOH-MWCNT对机械，热和可燃性的协同作用。

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