용융방사한 고밀도 폴리에틸렌 폴리프로필렌블렌드 섬유의 물리적 성질

조준한; 최경식; 김상용

Korean Journal of Rheology, Vol.1, No.1, 63-70, November, 1989

Export Citation

용융방사한 고밀도 폴리에틸렌 폴리프로필렌블렌드 섬유의 물리적 성질

Physical Properties of the Melt Spun Fibers of the High Density Polyethylene and Polypropylene Blends

조준한, 최경식, 김상용

초록

고밀도 폴리에틸렌과 폴리프로필렌을 용융 혼합하여 블렌드를 만들었다. 압출물의 morphology와 유변학적 성질을 측정하고, 그 용융방사 섬유의 X-선 회절, 인장 성질, 복굴절률 등과 관련하여 고찰하였다. 파단면의 SEM사진으로부터 폴리에틸렌 성분비가 25%, 50%에서는 폴리프로필렌이, 75%에서는 폴리에틸렌이 연속상을 이루며, 분산상은 고르게 분포함을 알았다. 점도와 용융 탄성은 모두 폴리 에틸렌이 폴리프로필렌보다 크며, 블렌드에서는 그 중간에 위치하였다. 폴리에틸렌의 함량의 증가에 따라 압출물의 제 1법선 응력차는 증가하였고, 따라서 방사 섬유의 복굴절률도 증가하였으며, 초기 탄성률도 증가하는 경향을 보였으나 결정 배향도는 조성 의존성을 갖지 않는다. 두 고분자의 비상용성으로 인해 강도는 직선성에서 벗어나는 거동을 나타내었다.

Blends of high density polyethylene (HDPE) and polypropylene (PP) were prepared by melt mixing method. The morphology and the rheological properties of extrudates were measured and related with the physical properties of the melt spun fibers, such as X-ray diffraction patterns, tensile properties, and birefringence. From the SEM photographs of the fractured surfaces, it can be seen that PP forms a continuous phase in the blends of 25% and 50% of HDPE but HDPE does in 75% blend. In all cases, the discrete phases were finely distributed. The viscosity and the melt elasticity of HDPE were higher than those of PP and those of HDPE/PP blends were intermediate. The first normal stress difference of the extrudates increased with the increase of HDPE content, and thus the birefringence and the initial modulus of the spun fibers did with the HDPE content, but the crystalline orientation did not show any dependence on the composition. Tenacity showed a deviation from linearity due to the incompatibility.

Keywords:Melt blending/Melt spinning/PE/PP blend/Melt elasticity

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[2] Noel OF, Carley JF, Polym. Eng. Sci., 15, 117 (1975)

[3] Lovinger AJ, Williams ML, J. Appl. Polym. Sci., 25, 1703 (1980)

[4] Bartlett DW, Barlow JW, Paul DR, J. Appl. Polym. Sci., 27, 2351 (1982)

[5] Plochocki A, J. Appl. Polym. Sci., 16, 987 (1972)

[6] Plochocki A, "Polymer Blends," ed. by D.R. Paul, S. Newman, Vol. II, Academic, New York, Chap. 21 (1978)

[7] Alle N, Lynagaae-Jorgensen J, Rheol. Acta, 19, 94 (1980)

[8] Alle N, Lyngaae-Jorgensen J, Rheol. Acta, 19, 104 (1980)

[9] Valenza A, LaMantia FP, Acierno D, Eur. Polym. J., 20, 727 (1984)

[10] Liang B, White JL, Spruiell JE, J. Appl. Polym. Sci., 28, 2011 (1983)

[11] Min K, White JL, Fellers JF, J. Appl. Polym. Sci., 29, 2117 (1984)

[12] Deopura BL, Kadam S, J. Appl. Polym. Sci., 31, 2145 (1986)

[13] Cox WP, Merz EH, J. Polym. Sci., 28, 619 (1958)

[14] Laun HM, J. Rheol., 30, 459 (1986)

[15] Bird RB, Armstrong RC, Hassager O, "Dynamics of Polymeric Liquids," J. Wiley & Sons, New York, Chap. 3 (1987)

[16] Wilchinsky ZW, J. Appl. Phys., 31, 1969 (1960)

[17] Nadella HP, Henson HM, Spruiell JE, White JL, J. Appl. Polym. Sci., 21, 3003 (1977)

[18] Stein RS, J. Polym. Sci., 31, 327 (1958)