Article
  • Effect of Stereoregularity on the Properties of Ethylene-propylene Rubber
  • Cho UR
  • 에틸렌-프로필렌 고무의 물성에 대한 입체 규칙성의 영향
  • 조을룡
Abstract
Three kinds of ethylene-propylene rubbers (EPR's) having the same ethylene(E)-propylene(P) molar ratio (E/P = 50/50) with different stereoregularity, that is, random EPR(r-EPR), alternating-EPR (alt-EPR) and isotactic-alternating-EPR ( iso-alt-EPR), were used for the investigation of their properties depending on the stereoregularity. No melting point was found in r-EPR. alt-EPR and iso-alt-EPR showed melting points. Density increases in order of r-EPR < alt-EPR < iso-alt-EPR with increasing stereoregularity. In tensile strength test, breaking stress also increases going from r-EPR, alt-EPR, iso-alt-EPR with increase of stereoregularity, but elongation displayed the opposite order.

에틸렌(E)과 프로필렌(P)의 몰%가 동일(E/P=50/50)하나 입체규칙성이 서로 다른 3종류의 에틸렌-프로필렌 고무들(EPR's)인 random EPR(r-EPR), alternating-EPR(alt-EPR) 및 isotactic-alternating-EPR(iso-alt-EPR)을 사용하여 입체규칙성에 따른 EPR's의 물성을 조사하였다. r-EPR은 용융점이 존재하지 않았으나 alt-EPR과 iso-alt-EPR은 용융점이 존재하며 입체규칙성에 따라 증가하였다. 밀도는 r-EPR < alt-EPR < iso-alt-EPR 순으로 증가하여 입체규칙성과 비례하였다. 인장 강도 시험에서 breaking stress는 입체규칙성에 비례하여 r-EPR < alt-EPR < iso-alt-EPR 순으로 증가하였으며 신장율 시험에서는 반대 현상을 보였다.

Keywords: ethylene-propylene rubber; hydrogenation; stereoregularity

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  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2023 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 1995; 19(4): 515-520

    Published online Jul 25, 1995