Mechanical, thermal properties, and flame retardancy of PC/ultrafine octaphenyl‐POSS composites
Mechanical, thermal properties, and flame retardancy of PC/ultrafine octaphenyl‐POSS composites
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DOI：
10.1002/app.35443
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发表时间：
2012-06
影响因子：
3
通讯作者：
Lamei Li;Xiangmei Li;Rongjie Yang
中科院分区：
文献类型：
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作者：
Lamei Li;Xiangmei Li;Rongjie Yang
采用熔融共混法制备了超细多面体低聚倍半硅氧烷(OPS)/聚碳酸酯(PC)复合材料。通过拉伸和弯曲试验、冲击试验、差示扫描量热仪(DSC)、动态力学分析(DMA)和热重分析(TGA)对复合材料的力学性能和热性能进行了表征。用扭矩流变仪测试了熔体的流变性能。通过极限氧指数(LOI)、垂直燃烧试验(UL-94)和锥形量热仪测试了复合材料的阻燃性能。用扫描电子显微镜(SEM)和ATR-FTIR光谱对残炭进行了表征。此外，扫描电子显微镜证实了OPS粒子在PC基质中的分散。结果表明，随着OPS加载量的增加，复合材料的玻璃化转变温度(Tg)和扭矩降低。复合材料的起始分解温度低于PC。PC/OPS复合材料的LOI值和UL-94等级随OPS用量的增加而增大。当OPS负载达到6wt%时，LOI值为33.8%，获得了UL-94(1.6 mm)V-0额定值，峰值释热率从570kJ m−2降至292kJ m V0。
Composites of ultrafine polyhedral oligomeric octaphenyl silsesquioxane (OPS) and polycarbonate (PC) were prepared by melt blending. The mechanical and thermal properties of the composites were characterized by tensile and flexural tests, impact test, differential scanning calorimeter (DSC), dynamic mechanical analysis (DMA), and thermal gravimetric analysis (TGA). Rheological properties of these melts were tested by torque rheometer. The flame retardancy of the composites was tested by limiting oxygen index (LOI), the vertical burning (UL-94), and cone calorimeter test. The char residue was characterized by scanning electron microscope (SEM) and ATR-FTIR spectrum. Furthermore, the dispersion of OPS particles in the PC matrix was evidenced by SEM. The results indicate that the glass transition temperatures (Tg) and torque of the composites decrease with increasing OPS loading. The onset decomposition temperatures of composites are lower than that of PC. The LOI value and UL-94 rating of the PC/OPS composites increase with increasing loading of OPS. When OPS loading reaches 6 wt %, the LOI value is 33.8%, UL-94 (1.6 mm) V-0 rating is obtained, and peak heat release rate (PHRR) decreases from 570 to 292 kJ m−2. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012