Meisam Shabanian
,
Mohsen Hajibeygi
,
Mehdi Roohani
新型炭材料
doi:10.1016/S1872-5805(15)60199-8
首先通过壬二酸和双(对-羧苯基)苯基氧化膦直接缩聚反应得到半芳香聚酰胺( PA) ,采用溶液共混方法,以多壁碳纳米管( CNTs)增强PA得到新型纳米复合材料. 通过TG-DSC和微尺度燃烧量热法探讨CNTs对复合材料的热性能和可燃性能的影响. 当CNT添加量为5%时复合材料的失重率比纯PA提高5%,热分解温度提高70 ℃. 与纯PA相比,复合材料的热释放速率降低,这表明CNTs能提高PA的阻燃性.
关键词:
多壁碳纳米管
,
纳米复合材料
,
聚酰胺
,
阻燃
Zhongming LI
,
Mingbo YANG
,
Rui HUANG
,
Ai LU
,
Jianmin FENG
材料科学技术（英）
In-situ composites based on dispersed poly (ethylene terephthalate) (PET) or polyamide (PA), and continuous polyethylene (PE) were prepared through a single screw extruder of Haake rheometer system with a rod-die relatively small in diameter. The extrudate was drawn at a drawing ratio of 3.1, and then quickly cooled in cold water. The specimens were obtained by injection molding at processing temperatures less than 190°C, far below the melting temperature of PET (265°C) and PA (230°C), which can maintain the solid state of PET and PA microfiber phase in the composites. Morphological observation with scanning electron microscopy (SEM) indicated that PET and PA can more or less form in-situ microfibers at compositions studied (0~20 wt pct PET or PA), and especially, PET and PA were almost deformed into fibers at the concentration of 15 wt pct. Tensile strength and modulus of the blends reinforced by PET or PA microfibers showed to be increased from the tensile test results. The most noticeable improvement of the tensile properties occurred at 15 wt pct of PET in PET/PE system, corresponding to the highest microfiber content, where the tensile strength reached 32.5 MPa, whereas only 19.5 Mpa for the pure PE.
关键词:
In-situ composite
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