화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Polymer(Korea), Vol.20, No.5, 813-822, September, 1996
Export Citation
폴리카보네이트와 열방성 액정고분자 블렌드의 물성에 관한 연구
Properties of Blends of Polycarbonate and a Thermotropic Liquid Crystalline Polymer
이헌상, 정원호, 정현욱, 김우년, 현재천
초록
폴리카보네이트(PC)와 열방성 액정고분자(LCP) 블렌드의 열적 거동, 모폴로지, 그리고 유변학적 물성을 시차 주사 열분석기, 주사 전자 현미경, 편광 현미경, 그리고 회전 레오미터를 이용하여 조사하였다. 측정된 유리전이온도(Tg)의 결과로부터 LCP가 PC-rich 상(phase)에 녹아 들어가는 양이 PC가 LCP-rich상에 녹아들어가는 양보다 많음을 알 수 있었다. LCP의 이방성을 고려한 격자이론(lattice theory)으로부터 제안된 식을 이용하여 PC-LCP (5 : 5) 블렌드의 고분자-고분자간 상호작용계수(χ12)를 결정할 수 있었으며, 523 K에서 0.068의 값을 가짐을 알 수 있었다. PC의 전단점도는 소량의 LCP가 첨가됨에 따라 급격히 감소하였으며, 이 결과는 LCP가 섬유상 구조를 형성하기 때문이었다. 낮은 진동수 영역에서 소량의 LCP가 포함된 블렌드의 저장탄성율이 매트릭스인 PC의 저장탄성율보다 높게 나타났으며, 이는 분산상이 구형으로 잘 분산된 경우 분산상 자체가 탄성을 가지기 때문인 것으로 사료된다.
Thermal properties, morphology, and rheological properties of the blends of polycarbonate (PC) and a thermotropic liquid crystalline polymer (LCP) prepared by screw extrusion have been investigated by differential scanning calorimeter (DSC), scanning electron microscopy (SEM), polarized optical microscopy, and rotational rheometry. From the measured glass transition temperature (Tg), the LCP appears to dissolve more in the PC-rich phase than does the PC in the LCP-rich phase. The polymer-polymer interaction parameter (χ12) and the degree of disorder (y/χ1 ) of LCP were investigated using lattice theory in which the anisotropy of LCP was considered. The polymer-polymer interaction parameter (χ12) were determined and found to be 0.068 for the extruded blends of PC-LCP (5 : 5) at 523 K. Significant depression of the viscosity is observed in the PC-rich blends and this is mainly due to the fibrous structure of the LCP in the blends. The storage modulus of the PC-rich compositions exceeds that of the matrix component at low frequencies and this result may be due to the increase of elasticity of the blends.
Keywords:polycarbonate;liquid crystalline polymer;blend;morphology;rheology
  1. Lin Q, Jho J, Yee AF, Polym. Eng. Sci., 33, 789 (1993) 
  2. Malik TM, Carreau PJ, Chapleau N, Polym. Eng. Sci., 29, 600 (1989) 
  3. Chapleau N, Carreau PJ, Peleteiro C, Lavoie PA, Malik TM, Polym. Eng. Sci., 32, 1876 (1992) 
  4. Ajji A, Gignac PA, Polym. Eng. Sci., 32, 903 (1992) 
  5. Jung SH, Kim SC, Polym. J., 20, 73 (1988) 
  6. Blizard KG, Baird DG, Polym. Eng. Sci., 27, 653 (1987) 
  7. Beery D, Kenig S, Siegmann A, Polym. Eng. Sci., 33, 1548 (1993) 
  8. Mehta A, Isayev AI, Polym. Eng. Sci., 27, 684 (1987) 
  9. Amendola E, Carfagna C, Netti P, Nicolais L, Saiello S, J. Appl. Polym. Sci., 50, 83 (1993) 
  10. Long ER, Collins WD, Polym. Eng. Sci., 28, 823 (1988) 
  11. Nobile MR, Acierno D, Incarnato L, Nicolais L, J. Rheol., 34, 1181 (1990) 
  12. Nobile MR, Acierno D, Incarnato L, Amendola E, Nicolais L, Carfagna C, J. Rheol., 41, 2723 (1990)
  13. Weiss RA, Huh W, Nicolais L, Polym. Eng. Sci., 27, 684 (1987) 
  14. Bafna SS, Sun T, Barid DG, Polymer, 4, 708 (1993) 
  15. Lee S, Hong SM, Seo Y, Park TS, Hwang SS, Kim KU, Lee JW, Polymer, 35(3), 519 (1994) 
  16. Kosfeld R, Hess M, Friedrich K, Mater. Chem. Phys., 18, 93 (1987) 
  17. Friedrich K, Hess M, Kosfeld R, Makromol. Chem. Makromol. Symp., 16, 251 (1988)
  18. Nobile MR, Amendola E, Nicolais L, Acierno D, Carfagna C, Polym. Eng. Sci., 29, 244 (1989) 
  19. Zhong P, Kyu T, White JL, Polym. Eng. Sci., 28, 1095 (1988) 
  20. Kim WN, Burns CM, Macromolecules, 20, 1876 (1987) 
  21. Kim WN, Burns CM, J. Appl. Polym. Sci., 32, 2989 (1986) 
  22. Burns CM, Kim WN, Polym. Eng. Sci., 28, 1362 (1988) 
  23. Vanneste M, Groeninckx G, Polymer, 35(1), 162 (1994) 
  24. Say YS, J. Appl. Polym. Sci., 44, 371 (1992) 
  25. Yeung C, Desai RC, Noolandi J, Macromolecules, 27(1), 55 (1994) 
  26. Willet SL, Wool RP, Macromolecules, 26, 5336 (1993) 
  27. Helfand E, Tagami T, J. Chem. Phys., 56, 3592 (1972) 
  28. Han CD, Kim JK, Macromolecules, 22, 1914 (1989) 
  29. Meuse MT, Jaffe M, Mol. Cryst. Liq. Cryst. Inc. Nonlin. Opt., 157, 535 (1988)
  30. Lee HS, Jung WH, Kim WN, Polym. Bull., in press (1996)
  31. Sun T, Porter RS, Polym. Commun., 31, 70 (1990)
  32. Sun T, Lin YG, Winter HH, Porter RS, Polymer, 30, 1257 (1989) 
  33. Jackson WJ, Kuhfuss HF, J. Polym. Sci., 14, 2043 (1976)
  34. Done D, Barid DG, Polym. Eng. Sci., 30, 989 (1990) 
  35. Zachariades AE, Economy J, Logan JA, J. Appl. Polym. Sci., 27, 2009 (1982) 
  36. Nicely VA, Dougherty JT, Renfro LW, Macromolecules, 20, 573 (1987) 
  37. Lin YG, Winter HH, Polym. Eng. Sci., 32, 773 (1992) 
  38. Shinn TH, Lin CC, J. Appl. Polym. Sci., 47, 1105 (1993) 
  39. Amundson KR, Reimer JA, Denn MM, Macromolecules, 24, 3250 (1991) 
  40. Shinn TH, Chen JY, Lin CC, J. Appl. Polym. Sci., 47, 1233 (1993) 
  41. Huang K, Lin YG, Winter HH, Polymer, 33, 4533 (1992) 
  42. Joseph E, Wilkes GL, Baird DG, Polymer, 26, 689 (1985) 
  43. Fox TG, Macromolecules, 11, 1156 (1978) 
  44. Favis BD, Chalifoux JP, Polym. Eng. Sci., 27, 1591 (1987) 
  45. Flory PJ, Abe A, Macromolecules, 11, 1119 (1978) 
  46. Abe A, Flory PJ, Macromolecules, 11, 1122 (1978) 
  47. Flory PJ, Frost RS, Macromolecules, 11, 1126 (1978) 
  48. Frost RS, Flory PJ, Macromolecules, 11, 1134 (1978) 
  49. Flory PJ, Macromolecules, 11, 1138 (1978) 
  50. Flory PJ, Macromolecules, 11, 1141 (1978) 
  51. Flory PJ, Ronca G, Mol. Cryst. Liq. Cryst., 54, 289 (1979)
  52. Flory PJ, Ronca G, Mol. Cryst. Liq. Cryst., 54, 311 (1979)
  53. Lee HS, Kim MS, Kim WN, Hyun JC, Korean J. Rheol., 7(3), 250 (1995)
  54. Lee HS, Kim Y, Kim WN, Hyun JC, Oh TS, Korean J. Rheol., 6(2), 96 (1994)
  55. Kim WN, Denn MM, J. Rheol., 36, 1477 (1992) 
  56. Oldroyd JG, Proc. R. Soc. London Ser. A, 218, 122 (1953)
  57. Palierne JF, Rheol. Acta, 29, 204 (1990)