Structure and Flame Retardant Property of Composite Materials MWNTs/CMSs/PET

doi:10.11901/1005.3093.2016.150

Chinese Journal of Materials Research

2016, Vol. 30

Issue (8): 581-588 DOI: 10.11901/1005.3093.2016.150

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Structure and Flame Retardant Property of Composite Materials MWNTs/CMSs/PET

XUE Baoxia², NIU Mei^1,^2,^**, LI Jingjing², YANG Yaru², DAI Jinming^1,²

1. Key Laboratory of Interface Science and Engineering in Advanced Materials , Taiyuan University of Technology, Ministry of Education, Taiyuan 030024, China
2. College of Textile Engineering , Taiyuan University of Technology, Yuci 030600, China

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XUE Baoxia, NIU Mei, LI Jingjing, YANG Yaru, DAI Jinming. Structure and Flame Retardant Property of Composite Materials MWNTs/CMSs/PET. Chinese Journal of Materials Research, 2016, 30(8): 581-588.

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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.

Key words: composite flame retardant mechanism polyethylene terephthalate multi-walled carbon nanotubes carbon microspheres

Received: 19 March 2016

Fund: *Supported by National Natural Science (Youth) Foundation of China No51302183, National Natural Science Foundation of China No51443005, Shanxi Province Natural Sciences (Youth) Foundation No.2012021021-6, and Shanxi Province Natural Sciences Foundation No.2014011016-5

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	Baoxia XUE
	Mei NIU
	Jingjing LI
	Yaru YANG
	Jinming DAI

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.150 OR https://www.cjmr.org/EN/Y2016/V30/I8/581

Table 1 TheLOI values and vertical combustion parameters of MWNTs / CMSs /PET

Fig.1 The fracture morphologies of MWNTs/CMSs/PET composites with different MWNTs to CMSs mass ratios (a) 1:1/4; (b) 1:1/2; (c) 1:1; (d) 1:2; (e) 1:4

Table 2 Data of cone testfor PET composites (50kW/m²)

Fig.2 Digital photos of carbon residues after cone test (A₁, A₂:PET; B₁, B₂: CMSs/PET; C₁, C₂: MWNTs/CMSs/PET)

Fig.3 (a) TG-DTG curves of PET in oxygen gas and (b) IR spectra of PET pyrolysis products during the different weightlessness stages (A-the first weightlessness stage; B-the second weightlessness stage)

Fig.4 (a) TG-DTG curves of MWNTs/CMSs/PET in oxygen gas and (b) IR spectra of pyrolysis products during the different weightlessness stages (IR: A-the first weightlessness stage; B-the second weightlessness stage)

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