Isothermal Crystallization Kinetics of a Novel Halogen-free Intumescent Flame-retardant Low-density Polyethylene

doi:10.11901/1005.3093.2013.701

Chinese Journal of Materials Research

2014, Vol. 28

Issue (4): 300-307 DOI: 10.11901/1005.3093.2013.701

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Isothermal Crystallization Kinetics of a Novel Halogen-free Intumescent Flame-retardant Low-density Polyethylene

Lingang LU^1,^**(

),Wei JIANG²,Shoushen YANG³,Xiaonan XU³,Dawei WANG²,Jing JIN³

1. Department of Science and Technology, Chinese People's Armed Police Force Academy, Langfang 065000
2. Graduates Forces, Chinese People's Armed Police Force Academy, Langfang 065000
3. Department of Fire Protection Engineering, Chinese People's Armed Police Force Academy, Langfang 065000

Cite this article:

Lingang LU,Wei JIANG,Shoushen YANG,Xiaonan XU,Dawei WANG,Jing JIN. Isothermal Crystallization Kinetics of a Novel Halogen-free Intumescent Flame-retardant Low-density Polyethylene. Chinese Journal of Materials Research, 2014, 28(4): 300-307.

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Abstract

A novel halogen–free composite of intumescent flam retardant (IFR)-/ low-density polyethylene (LDPE) was prepared by melt blending LDPE and IFR,, the later consisted of 1, 3, 5-tri (5, 5-dibromomethyl-1, 3-dioxaphosphorinanyl-2-oxy) benzene(FR)and polyphosphate (APP ). The flame retardancy of IFR/LDPE composite was examined by using oxygen index meter. The influence of IFR on the non-isothermal crystallization kinetics of LDPE was investigated by differential scanning calorimeter. The crystallization characteristics of the composite were analyzed by methods of Jeziorny, Ozawa and Mo Zhi-shen. The activation energy of the LDPE and IFR/LDPE were calculated by the Kissinger and Takhor methods. The results show that the limited oxygen index value of IFR/LDPE could reach 31.7% and the total crystallization rate of IFR/LDPE decreased with the addition of 25 %(mass fraction)IFR. Therefore, the addition of IFR might bring a negative effect on the crystallization process of LDPE.

Key words: inorganic nonmetallic materials intumescent flame retardant (IFR) LDPE flame retardancy DSC non-isothermal crystallization kinetics

Received: 23 September 2013

Fund: *Supported by the Natural Science Foundation of Hebei Province of China No.E2012507008.

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	Lingang LU
	Wei JIANG
	Shoushen YANG
	Xiaonan XU
	Dawei WANG
	Jing JIN

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https://www.cjmr.org/EN/10.11901/1005.3093.2013.701 OR https://www.cjmr.org/EN/Y2014/V28/I4/300

Table 1 Influence of the content of IFR on flame retardancy of LDPE

Table 2 Mechanical experimental results of pure LDPE and IFR/LDPE composite

Fig.1 Non-isothermal crystallization DSC curves for LDPE and IFR/LDPE blends (a) LDPE, (b) IFR/LDPE

Table 3 Parameters of LDPE and IFR/LDPE samples during non-isothermal crystallization process

Fig.2 X_c(t)-t curves of LDPE and IFR/LDPE at various cooling rate (a) LDPE, (b) IFR/LDPE

Fig.3 X_c(t) vs temperature curves of LDPE and IFR/LDPE at various cooling rate (a) LDPE, (b) IFR/LDPE

Table 4 Nonisothermal crystallization kinetic parameters for LDPE and IFR/LDPE composites by Jeziorny method

Fig.4 ln[-ln(1-X_c(t))]-lnt curves of LDPE and IFR/LDPE at various cooling rate (a) LDPE, (b) IFR/LDPE

Fig.5 ln[-ln(1-X_c(t))] vs lnR curves of LDPE and IFR/LDPE at various cooling rate (a) LDPE, (b) IFR/LDPE

Fig.6 lnR vs lnt curves of LDPE and IFR/LDPE at various cooling rate (a) LDPE, (b) IFR/LDPE

Table 5 Nonisothermal crystallization kinetic parameters for LDPE and IFR/LDPE composites by Mo method

Fig.7 Activation energy of non-isothermal crystallization curves of LDPE and IFR/LDPE by Kissinger and Takhor method (a) Kissinger method, (b) Takhor method

Table 6 The activation energy of non-isothermal crystallization of the LDPE and IFR/LDPE composites by Kissinger and Takhor method

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