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On-line Access: 2021-07-19

Received: 2020-07-16

Revision Accepted: 2020-11-19

Crosschecked: 2021-06-30

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Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Ya-jian Wang

https://orcid.org/0000-0002-5255-4449

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Journal of Zhejiang University SCIENCE A 2021 Vol.22 No.7 P.499-513

http://doi.org/10.1631/jzus.A2000312


Effect of thermo-oxidation on the dynamical and physical properties of ethylene-propylene-diene monomer elastomer


Author(s):  Ya-jian Wang, Yu-you Yang, Lin-bing Wang

Affiliation(s):  School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, China; more

Corresponding email(s):   yangyuyou@cugb.edu.cn

Key Words:  Ethylene-propylene-diene monomer (EPDM) elastomer, Thermo-oxidation, Glass transition temperature, Free volume, Crosslinking


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Ya-jian Wang, Yu-you Yang, Lin-bing Wang. Effect of thermo-oxidation on the dynamical and physical properties of ethylene-propylene-diene monomer elastomer[J]. Journal of Zhejiang University Science A, 2021, 22(7): 499-513.

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pages="499-513",
year="2021",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A2000312"
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%A Ya-jian Wang
%A Yu-you Yang
%A Lin-bing Wang
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%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A2000312

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T1 - Effect of thermo-oxidation on the dynamical and physical properties of ethylene-propylene-diene monomer elastomer
A1 - Ya-jian Wang
A1 - Yu-you Yang
A1 - Lin-bing Wang
J0 - Journal of Zhejiang University Science A
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SP - 499
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A2000312


Abstract: 
Understanding the underlying processes associated with the thermo-oxidative performance of the ethylene-propylene-diene monomer (EPDM) is essential for assessing and improving its waterproofing performance in underground infrastructures. To explore the fundamentals of EPDM degradation behavior during thermal oxidation, this paper investigates the effects of hydrocarbon free chain, carbon crosslink, chain scission, hydroxyl, and ether crosslinks, on its kinetics and mechanical properties through molecular dynamics (MD) simulations. Several EPDM thermo-oxidative models were built and verified by comparing the simulation results of oxygen diffusivity, glass transition temperature, and mechanical properties with reported experimental ones. Then the radius of gyration, free volume, density, transport, glass transition, and uniaxial compression performance were investigated via MD simulations. The results show that crosslinking in the thermal oxidation process has a significant influence on the free volume, glass transition temperature, and mechanical properties of the system; the hydroxyl and chain scission mainly interfere with the transport properties; all of these affect the structural conformation.

热氧老化对三元乙丙橡胶动力学性能与物理性质的影响

目的:研究三元乙丙橡胶热氧老化性能衰退分子机制.
创新点:根据热氧老化路径,建立代表不同老化程度的三元乙丙分子动力学模型,从分子尺度解释了宏观力学行为.
方法:采用分子动力学模拟进行研究.
结论:1. 回转半径对自由体积有决定性作用,碳碳交联塑造的回转半径最大,其次分别为醚交联、自由链、羟基链和断链,因此各阶段产物对应的自由体积依此顺序减少.2. 醚交联产物尽管具有最大的自由体积,但交联约束了分子运动,因此粘性与弹性均降低.3. 交联产物增加玻璃化转变温度,自由链与断链产物降低玻璃化转变温度.4. 三元乙丙热氧化中期由于羟基和断链产物,降低了分子间的约束力,宏观表现为模量减小,后期由于醚交联密度增加,分子间约束力增大,宏观表现为模量增大.

关键词:三元乙丙橡胶;热氧老化;玻璃化转变;自由体积;分子交联

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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