Effects of Crystallinity on Degradation Properties of Polyethylene by Thermo-oxidation Aging

doi:10.11901/1005.3093.2016.035

Chinese Journal of Materials Research

2017, Vol. 31

Issue (1): 41-48 DOI: 10.11901/1005.3093.2016.035

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Effects of Crystallinity on Degradation Properties of Polyethylene by Thermo-oxidation Aging

Jun DAI¹,Hua YAN¹(

),Junjun GUO²,Lianyong SANG¹,Xuemei WANG¹

1 Department of Chemistry and Material Engineering, Logistics Engineering University, Chongqing 401331, China
2 Unit 73801, Wuxi 214000, China

Cite this article:

Jun DAI,Hua YAN,Junjun GUO,Lianyong SANG,Xuemei WANG. Effects of Crystallinity on Degradation Properties of Polyethylene by Thermo-oxidation Aging. Chinese Journal of Materials Research, 2017, 31(1): 41-48.

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Abstract

The degradation performance of polyethylene(PE) induced by artificial thermo-oxidation aging at 80℃ was characterized as a function of its crystallinity in terms of the variation of tensile strength, tensile modulus, impact strength and chromatic aberration. The variations of carbonyl index, hydroxyl index, chain scission and crystallinity of the three as prepared PE with different crystallinities were comparatively examined by attenuated total reflection infrared spectroscopy (ATR-FTIR). The results show that during thermo-oxidation aging at 80℃, the PE with higher degree of crystallinity experiences significant decrease of tensile property, slow decrease of impact property and faster increase of chromatic aberration. The higher the crystallinity, the molecular chains of the PE prone to breakage in the early aging stage, but its oxidation is more noticeable during the later aging stage. The crystallinity of the PE with different crystallinities trands essentially unchanged after the first rise throughout the aging cycle. But the thermo oxidation-aging has greater influence on the crystallinity,which increases significantly for the PE with lower crystallinity.

Key words: organic polymer materials crystallinity polyethylene thermo-oxidation aging ATR-FTIR

Received: 06 January 2016

Fund: Supported by Graduate Scientific Research and Innovation Foundation of Chongqing (No.CYS16239)

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	Jun DAI
	Hua YAN
	Junjun GUO
	Lianyong SANG
	Xuemei WANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.035 OR https://www.cjmr.org/EN/Y2017/V31/I1/41

Fig.1 Strain-stress curves of different degree of crystallinity in the PE for different aging time (a) 73%;(b) 67%;(c) 57%

Fig.2 Variations of mechanical property of different degree of crystallinity in the PE for different aging time (a) tensile strength;(b) tensile modulus; (c) impact strength

Fig.3 Variations of chromatic aberration values L and E of different degree of crystallinity in the PE for different aging time

Fig.4 FTIR spectra of different crystallinity PE at different aging times (a) 57%;(b) 67%;(c) 73%

Table 1 Studies on feature peaks of degradation of PE

Fig.5 Characteristic peaks, carbonyl index & hydroxyl index growth rate of different crystallinity at different aging times

Fig.6 Simulation of the chain session feature group for a Lorentzian distribution

Fig.7 Changes of absorbance of chain scission peaks at different aging times (a) 1650 cm^-1;(b) 1590 cm^-1

Fig.8 Changes of crystallinity at different aging times

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