Article
  • A Study on Morphology of Rubber Phase and Physical Properties by Melt Mixing in Propylene-Ethylene-Impact Copolymers
  • Kim HG, An JH, Kim JH
  • 프로필렌-에틸렌-임팩트공중합체에서 용융혼합에 의한 Rubber Phase의 모폴로지 및 물성편화에 대한 연구
  • 김형국, 안정호, 김중현
Abstract
The effect of repeated melt mixing by twin screw extruder on the variation of morphology and the various properties has been investigated. The repeated mixing by extruder has been applied to three samples which are expected to have different size of dispersed phase while having same ethylene contest. The resulting samples are tested to get the variation in morphology and properties such as impact strength, melt flow index, and heat deflection temperature. With the repeated extrusion, the increase in size and size distribution of dispersed phase has been observed for all of the three samples. Also the increase in melt index and yellow index has been found, indicating that the samples have experienced the degradation by heat and shear in the extruder. However, the detailed behaviour of morphological variation and degradation are found to be dependent on the initial morphology or melt flow index. Gardner impact strength is found to be sensitive to the size and the size distribution of dispersed phase as well as degradation while Izod impact strength was found to be relatively insensitive to those factors.

유사한 고무상 함량을 가진 프로필렌-에틸렌-임팩트공중합체에서 이축압출기를 이용한 반복된 압출시 초래되는 모폴로지 및 물성변화를 고찰하였다. 시료로는 초기의 고무상 분산상의 입자 크기가 다른 세 종류를 선택하여 압출을 반복하였고, 압출횟수에 따른 모폴로지의 변화와 충격강도, 용융흐름지수, 열변형온도 등의 물성변화를 측정하였다. 압출이 거듭됨에 따라 세 시료 모두 다소의 입자크기의 증가와 크기분포의 증가가 관찰되었다. 또한 용융흐름지수와 yellow index의 증가가 관찰되어 압출기의 열과 전단력에 의한 열화가 진행됨을 확인할 수 있었다. 그러나 모폴로지의 변화나 열화거동은 시료의 초기 모폴로지나 분자량에 따라 서로 다른 거동을 보였다. Gardner 충격강도는 입자크기나 크기분포 그리고 열화의 정도에 따라 상당히 민감한 변화를 보이나 Izod 충격강도에는 별다른 영향을 미치지 못함을 확인하였다.

Keywords: impact copolymer; impact strength; degradation; morphology

References
  • 1. 정기현프라스틱-이론과 실제, 6th ed., p. 141, 보진제 (1984)
  •  
  • 2. 홍창후고분자화학, 3rd ed., p. 65, 동명사 (1992)
  •  
  • 3. Modern Plastics Encyclopedia 90, p. 82, MaGraw-Hill Publication (1992)
  •  
  • 4. 김홍재폴리프로필렌수지, p. 82, 대광서림 (1987)
  •  
  • 5. Van Krevelen DWProperties of Polymers, p. 575, Elsevier, New York (1976)
  •  
  • 6. 홍창후고분자화학, p. 10, 동명사 (1982)
  •  
  • 7. Prentice P, Williams JG, Plast. Rubber Process Appl., 2, 27 (1982)
  •  
  • 8. Prabhu P, J. Polym. Sci., 19, 523 (1981)
  •  
  • 9. Yeh P, Polymer, 26, 1155 (1985)
  •  
  • 10. Sevan der Van, Propylene and Other Polyolefines, Elsevier, Netherlands (1990)
  •  
  • 11. Technology Manual for Polypropylene, Union Carbide Corp. (1986)
  •  
  • 12. ANTEC '89, New York (1989)
  •  
  • 13. Prentice P, Polym. Mater. Eng. Sci., 51, 635 (1984)
  •  
  • 14. Bucknall CBToughened Plastics, International Ideas, Philadelphia, PA (1977)
  •  
  • 15. Wild L, Adv. Polym. Sci., 38, 1 (1990)
  •  
  • 16. Kusy RP, Whitley JQ, J. Biomed. Mater. Res., 20, 1375 (1986)
  •  
  • 17. Mirabella FM, Polymer, 34, 1729 (1993)
  •  
  • 18. Danesi S, Porter RS, Polymer, 19, 448 (1978)
  •  
  • 19. Stehling FC, J. Appl. Polym. Sci., 26, 2693 (1981)
  •  
  • 20. Chang TCNew Advances in Polyolefins, Plenum, New York (1993)
  •  
  • 21. Wu S, Polym. Eng. Sci., 27, 335 (1987)
  •  
  • 22. Technology Manual, Ciba-Geigy Plastics & Additives
  •  
  • 23. Kambour RP, Macromol. Res., 7, 1 (1973)
  •  
  • 24. Bragaw CGAdvances in Chemistry Series, 99, ACS, Washington (1971)
  •  
  • 25. Silberberg J, Han CD, J. Appl. Polym. Sci., 22, 599 (1978)
  •  
  • 26. Fowles ME, Keskkula H, Paul DR, Polymer, 28, 1703 (1987)
  •  
  • 27. Bucknall CB, Makrom. Chemie. Macromol. Symp., 20-21, 425 (1988)
  •  
  • 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(6): 798-808

    Published online Nov 25, 1995