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Comparative Study on the Degradation Behavior of Degradable Polymers under Natural Environment between Japan and China

Research Project

Project/Area Number 02045008
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionUniversity-to-University Cooperative Research
Research InstitutionGunma University

Principal Investigator

OSAWA Zenjiro  Gunma University, Faculty of Engineering, Professor, 工学部, 教授 (50008439)

大沢 善次郎 (1991)  群馬大学, 工学部, 教授

Co-Investigator(Kenkyū-buntansha) LI Sanshi  Shenyang Institute of Chemical Technology, Applied Chemistry Department, Lecture, 講師
LI Anton  Shenyang Institute of Chemical Technology, Applied Chemistry Department, Lecture, 講師
TEN Jyunbun  Shenyang Institute of Chemical Technology, Applied Chemistry Department, Associa, 副教授
SYA Shinchan  Shenyang Institute of Chemical Technology, Applied Chemistry Department, Associa, 副教授
李 洙天  沈〓化工学院, 教授
KURODA Shinichi  Gunma University, Faculty of Engineering, Assistant, 工学部, 助手 (60205250)
KOBAYASHI Shodo  Gunma University, Faculty of Enginnering, Lecturer, 工学部, 講師 (60008448)
YANO Yumihiko  Gunma University, Faculty of Engineering, Professor, 工学部, 教授 (30008510)
LI Zhu-Tian  Shenyang Institute of Chemical Technology, Applied Chemistry Department, Profess
Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 1991: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1990: ¥1,800,000 (Direct Cost: ¥1,800,000)
KeywordsEthylene-carbon monoxide copolymer / Photodegradation / Outdoor exposure / Photodegradable polymer / Chain scission / Carbonyl content / Norrish type reaction / Formation of double bond / 自然暴露
Research Abstract

[1]. Introduction
Ethylene-carbon monoxide (E/CO) copolymers were exposed outdoors at Choshi, Sapporo, and Naha in Japan as well as at Shenyang, Qingdao, Zhengzhou, Xining, and Haikou in China for comparative studies on their degradation behaviors under different natural environments.
[2]. Relationships between photodegradations of E/CO and different natural environments
(1) In outdoor exposure the rate of degradation differed with the total radiation of ultraviolet light at the place of exposure. Actually the degradation proceeded rapidly at each city. However, the rate of degradation was in the following order : Haikou > Xining > Choshi.
(2) The degree of degradation varied from season to season because the total radiation of ultraviolet ligt differed with each season under exposing. For an example, at Choshi the radiation in summer is 1.3 times as much as in autumn and differences in the degradation of the polymers were recognized between both seasons.
(3) Degradations of E/CO copolymers were hardly affected by natural environmental factors except for the radiation of ultraviolet light.
(4) In the first stage of irradiation main chain scission of the polymers took place predominantly and this reaction led to the remarkable lowering of the molecular weight. The rate of chain scission became faster with increasing carbonyl content. The molecular weight of an E/CO sample (CO content 2.4%) exposed outdoors for only half a day decreased to about 1/3 of the initial one.
(5) Ultimate elongation of the exposed samples fell off remarkably at the very beginning of irradiation, and it differed significantly with place to place.
(6) As the rate of degradation depended on both the concentration of the carbonyl group and the total radiation of ultraviolet light at the place of exposure, the carbonyl content in E/CO copolymers should be determined by considering the radiation of ultraviolet light.

Report

(2 results)
  • 1991 Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] 大澤 善次郎: "光分解性プラスチックの現状と最近の研究報告" ウエザリング技術研究発開会、(財)日本ウエザリングテストセンタ-テキスト. 19-27 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 青木 晴夫,斎藤 利春,小林 正道,大澤 善次郎: "光崩壊性高分子エチレン・一酸化炭素共重合体の光分解挙動" 複合材料懇話会・研究成果発表会講演予稿集. 1-2 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 青木 晴夫,楡木 満実子,斎藤 利春,赤堀 慎一,小林 正道,大澤 善次郎: "光崩壊性高分子エチレン・一酸化炭素共重合体の光分解挙動" 第41回高分子学会年次大会研究発表会.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Z. Osawa: "Present Situations and Recent Study on Photodegradable Plastics" Weathering Technology Conference.19-27 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] S. Kobayashi: "Photodegradation Behavior of photodegradable Polymer, Ethylene-carbon monoxide copolymer" Conference on Composite Materials.1-2 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Z. Osawa: "Photodegradation Behavior of photodegradable Polymer, Ethylene-carbon monoxide copolymer" Polym. Prepr. Japan. 41 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 大澤 善次郎: "光崩壊性高分子エチレン・一編化炭素共重合体の光劣化" 高分子の崩壊と安定化研究討論会 発表予定(1991).

    • Related Report
      1990 Annual Research Report
  • [Publications] 大澤 善次郎: "日中自然環境下における崩壊性高分子の分解挙動の比較研究" マテリアルライフ学会研究討論会 発表予定 (1992).

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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