Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《材料研究学报》
Abstract： Composites of Multi- walled carbon nanotubes (MWNTs), carbon microspheres (CMSs) and Polyethylene terephthalate (PET) were prepared by melt blending method.The structures, flame retardancy and pyrolysis behavior of the composites were characterized by scanning electron microscope (SEM)and infrared spectroscopy (IR), as well as limiting oxygen index (LOI)method, vertical burning method (UL-94), cone calorimeter and thermal gravimetric analysis (TG).The results showed that the addition of 1% (mass fraction) of (1MWNTs + 0.5CMSs) into PET resulted in a good comprehensive flame retardancyof the composite. Moreover, in comparison with the pure PET and CMSs/PET, the composites MWNTs/CMSs/PET could reduce effectively the fire risk. The pyrolysis process of PET could be suppressed by the synergistic effect of MWNTs and CMSs due to the following that during burning, on one hand, MWNTs might give rise to form a three-dimensional network of compact carbon layeron the PET surface to decrease the melt drips; on the other hand, CMSs might produce a turbulent carbon layer on the surface of PET, preventing the oxygen and heat from entering the interior of PET and thus releasing the non-flammable CO2 to reduce the concentration of combustible gas in the surrounding environment.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-18 Cooperative journals: 《材料研究学报》
Abstract： Carbon microspheres (CMSs) were surface modified by the acid oxidation method and then grafted with aniline (An) by chemical synthesis to prepare compound CMSs-An. The CMSs-An/PET composite materials were prepared by melt blending CMSs- An and polyethylene glycol terephthalate (PET). The morphology, dispersiveness, thermal stability, flame retardant property and mechanical property of CMSs-An/PET materials were characterized by SEM, IR spectra, TG, oxygen index tester and vertical burning apparatus. The results show that, the aniline modified CMSs have better dispersiveness than that of the original CMSs in the PET matrix, and the tensile strength of CMSs-An/PET is 20.8% higher than that of CMSs/PET; in comparison with the pure PET, the CMSs-An/PET composite exhibits better performance: its thermal stability increased, limiting oxygen index increased by 7.5 and reached to 29.2, and vertical burning grades increased from V-2 level to V-0 level according to the national standards.
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