액정성 폴리에스테르와 폴리카보네이트의 블렌드에 관한 연구

주무성; 서문호; 이석현

Polymer(Korea), Vol.16, No.1, 36-43, January, 1992

Export Citation

액정성 폴리에스테르와 폴리카보네이트의 블렌드에 관한 연구

A Study on the Blends of Liquid Crystalline Polyester-Polycarbonate

주무성, 서문호, 이석현

초록

분자 복합재에 관한 기초연구로서 열방성 액정고분자와 열가소성 플라스틱의 혼련특성 규명을 시도하였다. 폴리카보네이트 기지재내에 막대형분자로 구성된 액정고분자를 분산시키기 위하여 시그마 블레이드형 용융혼합기와 단일 스크류식 압출기를 이용하였다. 압출시에는 유로가 균일한 다이와 수축후 확장하는 다이를 제작 사용함으로써 유동장에 따른 분산형태의 변화를 관찰하였다. 연구 결과에 의하면 시그마 블레이드형의 단순 용융혼합만으로는 액정고분자의 섬유상 분산이 얻어지지 않았으나 압출시에는 미세섬유상으로 분산되었으며, 섬유상의 직경은 전단속도, 기지재와 분산상의 상대점도 그리고 다이의 기하학적 형태에 의존하였다.

As a fundamental research for molecular composites, the mixing characteristics of a thermotropic liquid crystalline polymer(Vectra) with a thermoplastic polymer(polycarbonate) were investigated. We employed a melt mixer with a sigma blade and a single screw extruder to disperse the rod-like molecules of LCP in the flexible polycarbonate matrix. In case of extrusion, we used the straight and converging-diverging annular dies in order to understand the effect of various flow fields on the dispersion. The results showed that the obtained morphology of the dispersed phase was dependent on the type of mixing. The morphology of the blend mixed in the sigma-blade type mixer was not fibrilar. However, the dominant shape of the LCP was cylindrical fiber when mixed by extrusion. Diameters of the fiber were affected significantly by shear rates, die geometries and viscosity ratio between the dispersed phase and the matrix.

[References]

Utracki La, Favis BD, "Handbook of Polymer Science and Technology," ed. by N.P. Cheremisinoff, Vol. 4, Chap. 4, Marcel Dekker (1989)
Dibenedetto AT, Nicolais L, Amendola E, Carfagna C, Nobile MR, Polym. Eng. Sci., 29, 153 (1989)
Krigbaum WR, Liu CK, Yang DK, J. Polym. Sci. B: Polym. Phys., 26, 1711 (1989)
McKelvey JM, "Polymer Processing," p. 73-93, John Wiley and Sons, New York (1962)
Malik TM, Carreau PJ, Chapleau N, Polym. Eng. Sci., 29, 600 (1989)
Kim YS, Lee JO, Lee SH, Korean J. Rheol., 2(2), 56 (1990)
Doshi SR, Charrier JM, Polym. Compos., 10, 28 (1989)
Meier M, SPE 47th ANTEC Conf. Proc., 200 (1989)
Taylor GI, Proc. Royal. Soc., A146, 501 (1934)
Karam HJ, Bellinger JC, Ind. Eng. Chem. Fundam., 7, 576 (1968)
Tavagc T, Ph.D. Thesis, Department of Chemical Engineering, Univ. of Houston, Houston Texas (1972)

[Referenced By]

[1] Utracki La, Favis BD, "Handbook of Polymer Science and Technology," ed. by N.P. Cheremisinoff, Vol. 4, Chap. 4, Marcel Dekker (1989)

[2] Dibenedetto AT, Nicolais L, Amendola E, Carfagna C, Nobile MR, Polym. Eng. Sci., 29, 153 (1989)

[3] Krigbaum WR, Liu CK, Yang DK, J. Polym. Sci. B: Polym. Phys., 26, 1711 (1989)

[4] McKelvey JM, "Polymer Processing," p. 73-93, John Wiley and Sons, New York (1962)

[5] Malik TM, Carreau PJ, Chapleau N, Polym. Eng. Sci., 29, 600 (1989)

[6] Kim YS, Lee JO, Lee SH, Korean J. Rheol., 2(2), 56 (1990)

[7] Doshi SR, Charrier JM, Polym. Compos., 10, 28 (1989)

[8] Meier M, SPE 47th ANTEC Conf. Proc., 200 (1989)

[9] Taylor GI, Proc. Royal. Soc., A146, 501 (1934)

[10] Karam HJ, Bellinger JC, Ind. Eng. Chem. Fundam., 7, 576 (1968)

[11] Tavagc T, Ph.D. Thesis, Department of Chemical Engineering, Univ. of Houston, Houston Texas (1972)