Θ-조건 부근에서 폴리스티렌의 고유점성도 거동의 연구

박일현; 장태현

Polymer(Korea), Vol.16, No.6, 704-714, November, 1992

Export Citation

Θ-조건 부근에서 폴리스티렌의 고유점성도 거동의 연구

Behavior of Intrinsic Viscosity of Polystyrene near Θ-condition

박일현, 장태현

초록

단분산성 폴리스틸렌(polystyrene) 시료들을 여러 종류의 용매에 녹인 뒤 그들의 점성도 거동을 조사하여 최근에 보고되고 있는 불연속적인 Dondos형의 전이현상의 존재 여부 등을 조사하여보았다. 동일한 시스템을 선택하여 조사하여 보았으나 Dondos 형의 전이현상은 전혀 관찰되지 않았다. 특히 저분자량의 경우 여러 온도 및 조정에서 일정한 고유점성도 [η]를 보여주고 있는 것은 본 실험의 영역이 고분자 용액의 상그림에서 theta영역(theta region)에 해당되기 때문인 것이라고 해석할 수 있었다. theta 온도 근처에서 용액의 온도에 따른 고분자량의 [η]변화는 몇 가지 보정공식을 사용하여 단지 한 용액의 inherent viscosity로부터 손쉽게 예측할 수 있었고 그 곁과는 Flory의 고분자 사슬의 팽창이론과 잘 일치함을 알 수 있었다.

Behavior of the intrinsic viscosity [η] of monodisperse polystyrene(PS) samples above Θ-condition was investigated carefully in order to examine Dondos type transition of [η]. Dondos type transition of [η] was not observed in these experimental systems. On the contrary to Dondos' observation, the intrinsic viscosity data of low molecular weight PS samples showed constant values against solution temperature or the solvent composition in mixture solvents. Such results could be interpreted as a typical behavior at theta region in the phase diagram of polymer solution. In high molecular weight PS/cyclohexane system, temperature dependence of [η](T) near Θ temperature could be estimated easily through a couple of corrections from viscosity data of only one dilute polymer solution. Expansion factor α³(=[η](T)/[η](Θ)) of single polymer chain versus solution temperature agreed well with Flory theory.

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[1] Katime I, Riog A, GutierrezCabanas P, Eur. Polym. J., 10, 897 (1974)

[2] Katime I, RamiroVera C, Eur. Polym. J., 13, 783 (1977)

[3] Katime I, Ibarra X, Garay M, Valenciano R, Eur. Polym. J., 17, 685 (1981)

[4] Tsitsilianis C, Pierri E, Dondos A, J. Polym. Sci. C: Polym. Lett., 21, 685 (1983)

[5] Tsitsilianis C, Dondos A, Makromol. Chem. Rapid Commun., 5, 625 (1984)

[6] Tsitsilianis C, Dondos A, Polymer, 26, 1838 (1985)

[7] Tsitsilianis C, Dondos A, Macromolecules, 20, 658 (1987)

[8] Gargallo L, Gumes CL, Radic D, Eur. Polym. J., 20, 483 (1984)

[9] Ahmad N, Baloch MK, Saeed M, J. Chem. Soc.-Pak., 5, 155 (1983)

[10] Rashid HU, Abubakar SD, J. Polym. Sci. C: Polym. Lett., 27, 5 (1989)

[11] Tsitsilianis C, Staikos G, Dondos A, Rempp P, Benoit H, Makromol. Chem., 191, 2309 (1990)

[12] Mays JW, Hadjichristidis N, Fetters L, Macromolecules, 18, 2231 (1985)

[13] Bohdanecky M, Kovar J, "Viscosity of Polymer Solutions," Elsevier, New York, Chap. 3 (1982)

[14] Sakai T, J. Polym. Sci. A: Polym. Chem., 6, 1535 (1968)

[15] Sakai T, J. Polym. Sci. A: Polym. Chem., 6, 1659 (1968)

[16] Sakai T, Macromolecules, 3, 96 (1970)

[17] Sakai T, Makromol. Chem., 114, 284 (1968)

[18] Maron SH, Reznik RB, J. Polym. Sci. A: Polym. Chem., 7, 309 (1969)

[19] Flory PJ, "Principle of Polymer Chemistry," Cornell University Press, Ithaca, New York, Chap. XIV (1953)

[20] Rabek JF, "Experimental Methods in Polymer Chemistry," John Wiley & Sons, New York, Chap. 9 (1980)

[21] Daoud M, Jannink G, J. Phys. Paris, 37, 973 (1976)