열방성 액정 고분자와 폴리페닐렌 설파이드와의 블렌드에 관한 물성

이헌상; 김연희; 김우년; 현재천; 오택수

Korean Journal of Rheology, Vol.6, No.2, 96-103, December, 1994

Export Citation

열방성 액정 고분자와 폴리페닐렌 설파이드와의 블렌드에 관한 물성

Properties of Blends of a Thermotropic Liquid Crystalline Polymer with Polyphenylene Sulfide

이헌상, 김연희, 김우년, 현재천, 오택수

초록

열방성 액정 고분자인 벡트라와 폴리페닐렌 설파이드와의 블렌드를 주사 전자 현미경, 시차 주사 열분석기, 그리고 모세관 레오미터를 이용하여 전 조성 범위에 대하여 연구하였다. 블렌드의 결정화와 용융에 관한 연구결과로부터 두 고분자 사이에는 상호작용이 없음을 알 수 있다. 이는 두 개의 상이 완전히 분리되기 때문이다. 폴리페닐렌 설파이드를 많이 포함하고 있는 블렌드의 점도는 상당히 감소되었으며 이는 높은 전단속도에서 열방성 액정 고분자가 섬유구조를 갖기 때문이다. 열방성 액정 고분자의 섬유구조는 열방성 액정 고분자와 등방성상과의 점도비와 전단속도에 의해 영향을 받음을 알 수 있다.

Blends of Vectra A900, a thermotropic liquid crystalline polymer (LCP), and polyphenylene sulfide (PPS) were studied over the entire composition range using scanning electron microscope, differential scanning calorimeter, and capillary rheometer. Melting and crystallization data suggest that there is no interaction between the polymers since complete phase separation is observed between the two phases. Significant depression of the viscosity is observed in the PPS-rich blends and this is mainly due to the fibrous structure of the LCP at the high shear rate. The appearance of the fibrils of LCP is shown to dependent on the viscosity ratio of LCP to isotropic phase and the shear rates.

Keywords:Liquid crystalline polymer;polyphenylene sulfide;blend;rheology;morphology;thermal property;X-ray diffraction

[References]

National Reasearch Counsil, "Liquid Crystalline Polymers," Report of the Committee on Liquid Crystalline Polymer, NMAB-453, National Academy Press, Washington (1990)
Kiss G, Polym. Eng. Sci., 27, 410 (1987)
Blizard KG, Baird DG, Polym. Eng. Sci., 27, 653 (1987)
Kohli A, Chung N, Weiss RA, Polym. Eng. Sci., 29, 573 (1989)
LaMantia FP, Valenza A, Paci M, Maganini PL, Rheol. Acta, 28, 417 (1989)
Kim WN, Denn MM, J. Rheol., 36, 1477 (1992)
Dutta D, Fruitwala H, Kohli A, Weiss RA, Polym. Eng. Sci., 30, 1005 (1990)
Porter R, Polym. Eng. Sci., 32(1) (1992)
Ramanathan R, Blizard K, Baird D, SPE ANTEC, 46, 1123 (1988)
Heino MT, Seppala JV, J. Appl. Polym. Sci., 44, 2185 (1992)
Seppala J, Heino M, Kapanen C, J. Appl. Polym. Sci., 44, 1051 (1992)
Minkova LI, Paci M, Pracella M, Magagnini P, Polym. Eng. Sci., 32, 57 (1992)
Hoffman JD, Davis GT, Llauritzen JI, "Treatise on Solid State Chemistry," edited by N.B. Hannay, Vol. II, Plenum, New York (1975)
Mehta A, Gaur U, Wunderlich B, J. Polym. Sci. B: Polym. Phys., 16, 289 (1978)
Tang P, Reimer JA, Denn MM, Macromolecules, 26, 4269 (1993)
Kaito A, Kyotani M, Nakayama K, Macromolecules, 24, 3244 (1991)
Roland CM, Polym. Eng. Sci., 31, 849 (1991)
Kalika DS, Nuel L, Denn MM, J. Rheol., 33, 1059 (1989)
Nuel L, Denn MM, Rheol. Acta, 30, 65 (1991)
Kim WN, Hyun JC, Giles DW, Denn MM, in preparation
Beery D, Kenig S, Siegmann A, Polym. Eng. Sci., 31, 451 (1991)

[Referenced By]

[1] National Reasearch Counsil, "Liquid Crystalline Polymers," Report of the Committee on Liquid Crystalline Polymer, NMAB-453, National Academy Press, Washington (1990)

[2] Kiss G, Polym. Eng. Sci., 27, 410 (1987)

[3] Blizard KG, Baird DG, Polym. Eng. Sci., 27, 653 (1987)

[4] Kohli A, Chung N, Weiss RA, Polym. Eng. Sci., 29, 573 (1989)

[5] LaMantia FP, Valenza A, Paci M, Maganini PL, Rheol. Acta, 28, 417 (1989)

[6] Kim WN, Denn MM, J. Rheol., 36, 1477 (1992)

[7] Dutta D, Fruitwala H, Kohli A, Weiss RA, Polym. Eng. Sci., 30, 1005 (1990)

[8] Porter R, Polym. Eng. Sci., 32(1) (1992)

[9] Ramanathan R, Blizard K, Baird D, SPE ANTEC, 46, 1123 (1988)

[10] Heino MT, Seppala JV, J. Appl. Polym. Sci., 44, 2185 (1992)

[11] Seppala J, Heino M, Kapanen C, J. Appl. Polym. Sci., 44, 1051 (1992)

[12] Minkova LI, Paci M, Pracella M, Magagnini P, Polym. Eng. Sci., 32, 57 (1992)

[13] Hoffman JD, Davis GT, Llauritzen JI, "Treatise on Solid State Chemistry," edited by N.B. Hannay, Vol. II, Plenum, New York (1975)

[14] Mehta A, Gaur U, Wunderlich B, J. Polym. Sci. B: Polym. Phys., 16, 289 (1978)

[15] Tang P, Reimer JA, Denn MM, Macromolecules, 26, 4269 (1993)

[16] Kaito A, Kyotani M, Nakayama K, Macromolecules, 24, 3244 (1991)

[17] Roland CM, Polym. Eng. Sci., 31, 849 (1991)

[18] Kalika DS, Nuel L, Denn MM, J. Rheol., 33, 1059 (1989)

[19] Nuel L, Denn MM, Rheol. Acta, 30, 65 (1991)

[20] Kim WN, Hyun JC, Giles DW, Denn MM, in preparation

[21] Beery D, Kenig S, Siegmann A, Polym. Eng. Sci., 31, 451 (1991)