열팽창 치공구를 이용한 열경화성 복합재료의 성형연구

이준호; 금성우; 장원영; 남재도; Jun Ho Lee; Sung Woo Keum; Won Young Jang; Jae-Do Nam

Polymer(Korea), Vol.24, No.5, 690-700, September, 2000

Export Citation

열팽창 치공구를 이용한 열경화성 복합재료의 성형연구

Thermally-Expandable Molding Process for Thermoset Composite Materials

이준호, 금성우, 장원영, 남재도 ^†

성균관대학교 고분자공학과

Jun Ho Lee, Sung Woo Keum, Won Young Jang, and Jae-Do Nam^†

Department of Polymer Science and Engineering, Sung Kyun Kwan University, Suwon 440-746, Korea

E-mail:

초록

본 연구에서는 온도의 상승에 의하여 부피가 팽창하는 열팽창 고무 치공구의 팽창 특성을 이용하여 열경화성 복합재료를 경화하고 압축하는 과정을 실험과 모델링을 통하여 해석하였다. 열팽창 고무치공구가 사용되는 닫힌계(fixed-volume process)와 열린계(variable-volume process)에서 예상되는 압력을 이론적으로 유도하였고, 경화가 수반되는 과정에 있어서는 실험을 통하여 열팽창 치공구와 프리프레그가 나타내는 압력을 측정하였다. 온도가 상승하고 경화가 수반되는 경우에 등속도 압축실험에 의하여 얻어진 응력-변형율 곡선은 비선형 점탄성 특성을 보여주었는데, 본 연구에서는 Maxwell모델을 KWW(Kohlrausch-Williame-Watts)식으로 변형시킨 모델식을 이용하여 이를 매우 정확하게 표현할 수 있었다. 이 모델을 이용하여 몰드의 부피를 고정시킨 상태에서 경화시키는 닫힌계 공정에서 예상되는 압력을 예측하였으며 따라서 열팽창 치공구를 열경화성 복합재료의 경화압축 공정에 성공적으로 적용하였고 이를 해석하였다.

In this study, an elastomer-assistered compression molding process was investigated by experiments as well as modeling for the long-fiber reinforced thermoset composites. The comsolidation pressure generated by fixed-volume and variable-volume conditons was thermodynamically derived for both elastomer and curing prepregs, and was compared with the pressure measured during curing of epoxy matrix. Exhibiting non-linear viscoelastic characteristics in the compressive stress-strain tests, the measured stress was well compared with a modifed KWW(Kohlrausch-Williame-Watts)equation, which is based on the Maxwell viscoelastic model. Using the developed model equations, the comsolidation pressure generated by the elastomer was successfully predicted for the compression molding process of thermoset composite materials in the closed model system.

Keywords:thermally-expandable rubber tool;KWW

[References]

Willams G, Watts DC, Trans. Faraday Soc., 66, 80 (1970)
Tarmopolskii YM, Peters ST, Beil AI, "Handbook of Composites," ed. by S.T. Peters, p. 456, Chapman and Hall, London, 1998 (1998)
Sidwell DR, "Handbook of Composites," ed. by S.T. Peters, p. 352, Chapman and Hall, London, 1998 (1998)
Fong L, Advani SG, "Handbook of Composites," ed. by S.T. Peters, p. 433, Chapman and Hall, London, 1998 (1998)
Gutowski TG, "Advanced Composite Manutacturing," ed. by T.G. Gutowski, p. 223, John Wiley & Sons, New York, 1997 (1997)
Kim SW, Lee KJ, Seferis JC, Nam JD, Adv. Polym. Technol., 16(3), 185 (1997)
Ku MK, Oh KS, Kim DW, Nam JD, Suh MH, Lee SH, 5th Pacific Polymer Conference, p. 197, October 26-30, Kyungju, Korea (1997)
Erik S, Robert M, J. Adv. Mater., 26, 2 (1994)
Cull RA, Jacobson L, McMahon DF, 36th Int'l. SAMPE Symp., 944 (1991)
Peterson AL, Cull RA, McMahon DF, 36th Int'l. SAMPE Symp., 959 (1991)
Van Krevelen DW, "Properties of Polymers," Elsevier, New York, 1990 (1990)
Gent AN, Scott KW, "Engineering with Rubber," Oxford Univ. Press, New York, 1997 (1997)
Mcrum NG, Buckley CP, Bucknall CB, "Principles of Polymer Engineering," Oxford University Press, New York, 1997 (1997)
Matsuoka S, "Relaxation Phenomena in Polymers," Oxford University Press, New York, 1992 (1992)
Ward IM, "Mechanical Properties of Solid Polymers," John Wiley & Sons, New York, 1985 (1985)
Mashimo S, Nozaki R, Yagihara S, Takeishi S, J. Chem. Phys., 77(12), 6259 (1982)
deGennes PG, "Scaling Concepts in Polymer Physics," Cornell Univ. Press, New York, 1985 (1985)
Adachi K, Imanishi Y, Kotaka T, J. Chem. Soc.-Faraday Trans., 85(5), 1065 (1989)
Boese D, Kremer F, Macromolecules, 23, 829 (1990)
Struik LCE, "Internal Stress-Dimensional Instabilities and Milecular Orientations in Plastics," John Wiley & Sons, New York, 1990 (1990)
Bair HE, Johnson GE, Anderson EW, Matsuoka S, Polym. Eng. Sci., 21(14), 930 (1981)
Ku MK, "Consolidation Pressure Control in Thermally Expandable Rubber Tool Process for Epoxy/Carbon Fiber Composite," Masters Thesis, Sung Kyun Kwan Univ. (1997)

[Related Articles]

[1] Willams G, Watts DC, Trans. Faraday Soc., 66, 80 (1970)

[2] Tarmopolskii YM, Peters ST, Beil AI, "Handbook of Composites," ed. by S.T. Peters, p. 456, Chapman and Hall, London, 1998 (1998)

[3] Sidwell DR, "Handbook of Composites," ed. by S.T. Peters, p. 352, Chapman and Hall, London, 1998 (1998)

[4] Fong L, Advani SG, "Handbook of Composites," ed. by S.T. Peters, p. 433, Chapman and Hall, London, 1998 (1998)

[5] Gutowski TG, "Advanced Composite Manutacturing," ed. by T.G. Gutowski, p. 223, John Wiley & Sons, New York, 1997 (1997)

[6] Kim SW, Lee KJ, Seferis JC, Nam JD, Adv. Polym. Technol., 16(3), 185 (1997)

[7] Ku MK, Oh KS, Kim DW, Nam JD, Suh MH, Lee SH, 5th Pacific Polymer Conference, p. 197, October 26-30, Kyungju, Korea (1997)

[8] Erik S, Robert M, J. Adv. Mater., 26, 2 (1994)

[9] Cull RA, Jacobson L, McMahon DF, 36th Int'l. SAMPE Symp., 944 (1991)

[10] Peterson AL, Cull RA, McMahon DF, 36th Int'l. SAMPE Symp., 959 (1991)

[11] Van Krevelen DW, "Properties of Polymers," Elsevier, New York, 1990 (1990)

[12] Gent AN, Scott KW, "Engineering with Rubber," Oxford Univ. Press, New York, 1997 (1997)

[13] Mcrum NG, Buckley CP, Bucknall CB, "Principles of Polymer Engineering," Oxford University Press, New York, 1997 (1997)

[14] Matsuoka S, "Relaxation Phenomena in Polymers," Oxford University Press, New York, 1992 (1992)

[15] Ward IM, "Mechanical Properties of Solid Polymers," John Wiley & Sons, New York, 1985 (1985)

[16] Mashimo S, Nozaki R, Yagihara S, Takeishi S, J. Chem. Phys., 77(12), 6259 (1982)

[17] deGennes PG, "Scaling Concepts in Polymer Physics," Cornell Univ. Press, New York, 1985 (1985)

[18] Adachi K, Imanishi Y, Kotaka T, J. Chem. Soc.-Faraday Trans., 85(5), 1065 (1989)

[19] Boese D, Kremer F, Macromolecules, 23, 829 (1990)

[20] Struik LCE, "Internal Stress-Dimensional Instabilities and Milecular Orientations in Plastics," John Wiley & Sons, New York, 1990 (1990)

[21] Bair HE, Johnson GE, Anderson EW, Matsuoka S, Polym. Eng. Sci., 21(14), 930 (1981)

[22] Ku MK, "Consolidation Pressure Control in Thermally Expandable Rubber Tool Process for Epoxy/Carbon Fiber Composite," Masters Thesis, Sung Kyun Kwan Univ. (1997)