Article
  • Effects of Antioxidant and Thermal Treatment on the Radiation Resistance of Polypropylene
  • Park SH, Kim HI, Kang PH, Nho YC
  • 폴리프로필렌의 내방사선성에 미치는 산화방지제와 열처리의 영향
  • 박성현, 김형일, 강필현, 노영창
Abstract
The effects of antioxidants and thermal treatment on the radiation resistance of the gamma-ray irradiated polypropylene (PP) were studied. The PP was blended with various antioxidants and was fabricated into a sheet. The PP sheet was irradiated with gamma-ray to a dosage of 25 kGy in the nitrogen atmosphere. The differences in both color and mechanical strength were investigated for the gamma-ray irradiated PP depending on the kind and the content of antioxidant. The residual amount of free radical and the variation of oxidation index were investigated for the gamma-ray irradiated PP with thermal treatment after irradiation. The PP having phosphite antioxidant showed little difference in color after gamma-ray irradiation compared with the PP having phenolic or amine antioxidant. Sufficient amount of free radical could be removed from the gamma-ray irradiated PP with thermal treatment after irradiation. The PP having phosphite antioxidant showed little difference in color after gamma-ray irradiation compared with the PP having phenolic or amine antioxidant. Sufficient amount of free radical could be removed from the gamma-ray irradiated PP by the thermal treatment at 130 ℃ for 30 min. Thermally treated PP showed lower oxidation index than the PP without thermal treatment.

의료용 등급의 폴리프로필렌 수지에 감마선을 조사한 후 내방사선성에 대한 산화방지제와 열처리의 효과에 대해 연구하였다. 폴리프로필렌과 여러 종류의 산화방지제를 혼합하고 이를 사이트 형태로 제작하여 질소분위기에서 25 kGy로 감마선 조사하였다. 감마선을 조사한 폴리프로필렌 사이트에 대해 산화방지제 종류 및 함량에 따른 색도 변화와 기계적 강도 변화를 조사하였으며 감마선 조사 후의 열처리 조건에 따른 라디칼 잔존량과 산화 지수의 변화를 측정하였다. 페놀계 및 아민계 산화방지제보다는 인계 산화방지제를 폴리프로필렌에 혼합하였을 때 감마선 조사 후 색도 변화를 최소화할 수 있었다. 130 ℃에서 30분 동안의 열처리에 의해 산화의 원인이 되는 자유라디칼을 충분히 제거할 수 있어 열처리하지 않은 폴리프로필렌보다 낮은 산화지수를 얻을 수 있었다.

Keywords: gamma-ray; irradiation; antioxidant; thermal treatment; polypropylene

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  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2022 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 2006; 30(1): 10-13

    Published online Jan 25, 2006

  • Received on Jun 14, 2005
  • Accepted on Jan 6, 2006