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首页> 外文期刊>Journal of Applied Polymer Science >Polycarbonate composites flame-retarded by polyphenylsilsesquioxane of ladder structure
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Polycarbonate composites flame-retarded by polyphenylsilsesquioxane of ladder structure

机译：梯形聚苯倍半硅氧烷阻燃的聚碳酸酯复合材料

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摘要

Polyphenylsilsesquioxane (PPSQ) of ladder structure synthesized in laboratory was incorporated into polycarbonate (PC) by means of a twin-screw extruder. Scanning electron microscopy (SEM) observations showed that spherical PPSQ particles of size 0.5-1.5 μm dispersed homogeneously in PC. The incorporation of PPSQ into PC improved the elongation at break and flexural strength. Thermal gravimetric analysis and Fourier transform infrared spectroscopy revealed that PPSQ made the initial thermal decomposition of PC happen fast. The early cleavages of C-C and C-O bonds in the PC chains induced crosslinking reaction in the condensed phase char. According to the cone calorimetry (CONE) tests, loading of 8 wt % PPSQ reduced the peak heat release rate of PC composites from 570 to 153 kW/m ~2. The chars obtained after CONE testing of PC/PPSQ composites showed continuous, smooth, flaky, and cascading char and SiO _2 ceramic layer on the top. These indicated the good flame retardancy of PC/PPSQ, that is the attainment of a UL-94 rating of V-0 (1.6 mm), and limiting oxygen index of 42.0% when PPSQ was in 8 wt % in PC.
机译：通过双螺杆挤出机将实验室合成的梯形聚苯倍半硅氧烷（PPSQ）掺入聚碳酸酯（PC）中。扫描电子显微镜（SEM）观察表明，尺寸为0.5-1.5μm的球形PPSQ颗粒均匀地分散在PC中。将PPSQ掺入PC可以改善断裂伸长率和抗弯强度。热重分析和傅里叶变换红外光谱表明，PPSQ使PC的初始热分解发生得很快。 PC链中C-C和C-O键的早期断裂引起了凝聚相炭中的交联反应。根据锥形量热法（CONE）测试，负载8 wt％的PPSQ将PC复合材料的峰值放热速率从570降低到153 kW / m〜2。经过PC / PPSQ复合材料的CONE测试后获得的炭块在顶部显示连续，光滑，片状和级联的炭块和SiO _2陶瓷层。这些表明PC / PPSQ具有良好的阻燃性，即达到V-0的UL-94等级（1.6毫米），并且当PC中PPSQ为8 wt％时极限氧指数为42.0％。

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