Modeling of oxidation process and property changes of ethylene-propylene-diene copolymer

Daomin Min, Shengtao Li, Naoshi Hirai, Yoshimichi Ohki

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The oxidation process induced in ethylene-propylene-diene (EPDM) copolymer by gamma irradiation was simulated by solving equations on chemical reactions and gas diffusion rates. As a result, distributions of oxidative products and gases and changes in material properties were clarified. All the oxidative products such as ketones, alcohols, and carboxylic acids, crosslinks between molecular chains, and chain scissions in EPDM increase with irradiation and they show concave spatial distributions inside the sample sheets. The simulation results demonstrates that EPDM becomes hard when it was irradiated by gamma rays and the increase in hardness is more significant at the surface of the sample sheet than its inside. Moreover, it was found that a low diffusion coefficient of oxygen in EPDM leads to the appearance of a clearer diffusion-limited regime of degradation. These simulation results are in good agreement with experimental results.

Original languageEnglish
Article number7422602
Pages (from-to)537-546
Number of pages10
JournalIEEE Transactions on Dielectrics and Electrical Insulation
Volume23
Issue number1
DOIs
Publication statusPublished - 2016 Feb 1

Fingerprint

Propylene
Ethylene
Copolymers
Irradiation
Oxidation
Diffusion in gases
Ketones
Carboxylic acids
Gamma rays
Spatial distribution
Chemical reactions
Materials properties
Alcohols
Hardness
Degradation
Oxygen
Gases

Keywords

  • EPDM
  • gamma irradiation
  • gas diffusion
  • oxidation process
  • oxidative degradation

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Modeling of oxidation process and property changes of ethylene-propylene-diene copolymer. / Min, Daomin; Li, Shengtao; Hirai, Naoshi; Ohki, Yoshimichi.

In: IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 23, No. 1, 7422602, 01.02.2016, p. 537-546.

Research output: Contribution to journalArticle

@article{a702f468cad54540994b28578e6d9dce,
title = "Modeling of oxidation process and property changes of ethylene-propylene-diene copolymer",
abstract = "The oxidation process induced in ethylene-propylene-diene (EPDM) copolymer by gamma irradiation was simulated by solving equations on chemical reactions and gas diffusion rates. As a result, distributions of oxidative products and gases and changes in material properties were clarified. All the oxidative products such as ketones, alcohols, and carboxylic acids, crosslinks between molecular chains, and chain scissions in EPDM increase with irradiation and they show concave spatial distributions inside the sample sheets. The simulation results demonstrates that EPDM becomes hard when it was irradiated by gamma rays and the increase in hardness is more significant at the surface of the sample sheet than its inside. Moreover, it was found that a low diffusion coefficient of oxygen in EPDM leads to the appearance of a clearer diffusion-limited regime of degradation. These simulation results are in good agreement with experimental results.",
keywords = "EPDM, gamma irradiation, gas diffusion, oxidation process, oxidative degradation",
author = "Daomin Min and Shengtao Li and Naoshi Hirai and Yoshimichi Ohki",
year = "2016",
month = "2",
day = "1",
doi = "10.1109/TDEI.2015.005400",
language = "English",
volume = "23",
pages = "537--546",
journal = "IEEE Transactions on Dielectrics and Electrical Insulation",
issn = "1070-9878",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "1",

}

TY - JOUR

T1 - Modeling of oxidation process and property changes of ethylene-propylene-diene copolymer

AU - Min, Daomin

AU - Li, Shengtao

AU - Hirai, Naoshi

AU - Ohki, Yoshimichi

PY - 2016/2/1

Y1 - 2016/2/1

N2 - The oxidation process induced in ethylene-propylene-diene (EPDM) copolymer by gamma irradiation was simulated by solving equations on chemical reactions and gas diffusion rates. As a result, distributions of oxidative products and gases and changes in material properties were clarified. All the oxidative products such as ketones, alcohols, and carboxylic acids, crosslinks between molecular chains, and chain scissions in EPDM increase with irradiation and they show concave spatial distributions inside the sample sheets. The simulation results demonstrates that EPDM becomes hard when it was irradiated by gamma rays and the increase in hardness is more significant at the surface of the sample sheet than its inside. Moreover, it was found that a low diffusion coefficient of oxygen in EPDM leads to the appearance of a clearer diffusion-limited regime of degradation. These simulation results are in good agreement with experimental results.

AB - The oxidation process induced in ethylene-propylene-diene (EPDM) copolymer by gamma irradiation was simulated by solving equations on chemical reactions and gas diffusion rates. As a result, distributions of oxidative products and gases and changes in material properties were clarified. All the oxidative products such as ketones, alcohols, and carboxylic acids, crosslinks between molecular chains, and chain scissions in EPDM increase with irradiation and they show concave spatial distributions inside the sample sheets. The simulation results demonstrates that EPDM becomes hard when it was irradiated by gamma rays and the increase in hardness is more significant at the surface of the sample sheet than its inside. Moreover, it was found that a low diffusion coefficient of oxygen in EPDM leads to the appearance of a clearer diffusion-limited regime of degradation. These simulation results are in good agreement with experimental results.

KW - EPDM

KW - gamma irradiation

KW - gas diffusion

KW - oxidation process

KW - oxidative degradation

UR - http://www.scopus.com/inward/record.url?scp=84963787680&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84963787680&partnerID=8YFLogxK

U2 - 10.1109/TDEI.2015.005400

DO - 10.1109/TDEI.2015.005400

M3 - Article

VL - 23

SP - 537

EP - 546

JO - IEEE Transactions on Dielectrics and Electrical Insulation

JF - IEEE Transactions on Dielectrics and Electrical Insulation

SN - 1070-9878

IS - 1

M1 - 7422602

ER -