Article
  • Extrusion Characteristics in Cracking of Polypropylene
  • Ryu SH
  • 폴리프로필렌 크랙킹에서의 압출특성
  • 류승훈
Abstract
Effects of barrel temperature profile and type of mixing section on the extrusion characteristics of peroxide premixed polypropylene were studied using single screw extruder. Higher extrusion rate was observed with decreasing barrel temperature of solid conveying zone and it was attributed to the increase of coefficient of friction between polymer and barrel in solid conveying zone. From extrusion data and screw cooling experiments, it may be concluded that solid conveying is most likely to be the rate controlling factor to increase the extrusion output rate. Different type of mixing section also affected the extrusion output rate and the molecular weight and its distribution. Blister ring mixing section resulted in slightly higher extrusion rate and relatlvely low molecular weight and narrow molecular weight distribution of final product than that of pin mixing section.

본 실험은 peroxide를 혼합한 polypropylene의 일축압출기에서의 압출거동에 대하여 알아보았다. 압출량은 solid conveying zone의 barrel 온도가 감소할수록 증가하는 현상을 나타내었으며 이는 powder 상태의 고분자와 barrel간의 마찰계수의 증가로 인하여 solid conveying zone에서의 powder 상태의 고분자의 이송능력이 향상되었기 때문으로 추정되었다. 압출실험과 screw 냉각실험으로부터 압출량을 증가시키기 위하여는 solid conveying이 속도결정인자임을 알 수 있었다. 서로 다른 혼합부의 형태 또한 압출량과 분자량 및 분자량분포에 영향을 나타내었다. 동일한 barrel 온도 조건하에서는 pin 형태의 혼합부에 비하여 blister ring 형태의 혼합부를 이용하는 것이 약간의 압출량 증가와 제품의 분자량이 상대적으로 낮고 분자량분포가 좁은 양상을 나타내었다.

Keywords: polypropylene; controlled degradation; single screw extruder; mixing section; barrel temperature profile

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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

  • 1995; 19(2): 207-212

    Published online Mar 25, 1995