• Development of thermoplastic Polyolefins for Bumper Cover : 2. Effect of Rubber Viscosity
  • Yoo TW, Park BH, Choi CH
  • 범퍼커버용 열가소성 폴리올레핀 수지의 개발:2. 고무점도의 영향
  • 유태욱, 박봉현, 최치훈
Abstract
The effect of viscosity and content of ethylene-propylene rubber (EPR) on rheology, morphology, and mechanical properties of polypropylene (PP) block copolymer/EPR blends was studied. Melt blends were prepared in a twin-screw extruder varing rubber content up to 40 wt%. Complex viscosity vs. rubber content plot showed a slight positive deviation from the additivity. Scanning electron micrographs (SEM) of blends showed that the size of dispersed phase was decreased with decreasing the viscosity of rubber. And the elongated structure was observed near the surface of injection-molded specimen. Flexural modulus, tensile strength, Rockwell hardness, and mold shrinkage were decreased with rubber content, however, elongation at break and notched Izod impact strength were increased.

폴리프로필렌 블록공중합체/에틸렌-프로필렌 고무 블렌드에서 고무의 점도 및 함량이 유변 특성, 모폴로지, 기계적 물성에 미치는 효과에 관하여 연구하였다. 고무함량을 40wt%까지 변화시키면서 이축압출기를 사용하여 용융블렌딩을 행하였다. 복합점도 대 고무함량 플롯에서는 선형성으로부터 약간의 양의 편차를 나타내었다. 주사전자현미경 사진에서 분산상의 크기는 고무의 점도가 감소할수록 감소하는 것을 관찰하였다. 그리고 사출시편의 표면부근에서는 연신된 구조가 관찰되었다. 굴곡탄성율, 인장강도, 록웰경도 및 금형수축율은 고무함량에 따라 감소하였으며, 신율 및 충격강도는 증가하였다.

Keywords: PP; EPR; rheology; morphology; mold shrinkage

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  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2024 Impact Factor : 0.6
  • Indexed in SCIE

This Article

  • 1996; 20(5): 805-812

    Published online Sep 25, 1996