셀룰로오스 분말을 이용한 에폭시 수지의 강인화

김준경; 이명천; 임순호; 최철림

Polymer(Korea), Vol.20, No.1, 126-133, January, 1996

Export Citation

셀룰로오스 분말을 이용한 에폭시 수지의 강인화

Toughening of Epoxy by Inclusion of Cellulose Particles

김준경, 이명천, 임순호, 최철림

초록

분말상 셀루로우스를 이용한 에폭시 수지 강인화의 경우 강인화재의 첨가에 따른 에폭시 고유의 탄성율이나 항복강도 등의 물성 손실은 발생하지 않는 반면 강인화도는 큰 증가를 보였다. 셀룰로오스에의한 강인화 효과는 에폭시 수지의 가교밀도에 영향을 받지 않으나 사용된 분말의 aspect ratio에 따라 크게 좌우 되며 aspect ratio 8에서 최대 강인화 효과를 나타낸다. 분말상 셀를로오스에 의한 주된 강인화 기구는 크랙 bridging 및 입자의 뽑힘현상으로 믿어지며 매트릭스의 소성변형을 동반하는 강인화 기구는 일어나지 않는다. 이 외에 강인화에 기여하는 기구로는 크랙 bifurcation, ductile fracture of celluose, 그리고 defibrillation 등이 있다.

By inclusion of cellulose particles, the fracture toughness of modified epoxies was considerably enhanced without loss of its inherent properties, such as modulus and yleld stress. The fracture toughness of modified epoxies is not affected by the crosslinking density of epoxy but affected by aspect ratio of cellulose particles. The maximum fracture toughness can be contained by using cellulose particles with aspect ratio 8. The increase in toughness in this system seems to arise from a combination of processes that include crack bifurcation, crack bridging, ductile fracture of cellulose, particle pull-out, and defibrillation. Among them, crack bridging and pull-out mechanisms are suggested as dominant toughening mechanisms for cellulose-modified epoxies.

Keywords:epoxy;cellulose;toughening;thermoplastic;toughener;toughening mechanisms

[References]

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Kim JK, Robertson RE, J. Mater. Sci., 27, 161 (1992)
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Pearson RA, Yee AF, Polym. Mater. Sci. Eng., 63, 311 (1990)
Scott JM, Wells GM, Phillips DC, J. Mater. Sci., 15, 1436 (1980)
Yamini S, Young RJ, J. Mater. Sci., 14, 1609 (1979)
Phillips DC, Scotts JM, Jones M, J. Mater. Sci., 13, 311 (1978)
Gledhill RA, Kinloch AJ, Yamini S, Young RJ, Polymer, 19, 574 (1978)
Philips DC, Scott JM, J. Mater. Sci. Lett., 9, 1202 (1974)
Hancock P, Cutherson RC, J. Mater. Sci., 5, 762 (1970)
Moloney AC, Kausch HH, Kaiser T, Beer HR, J. Mater. Sci., 22, 381 (1987)
Robertson RE, Mindroiu VE, Polym. Eng. Sci., 27, 55 (1987)
Evans AG, Wiederhoren SM, J. Mater. Sci., 9, 270 (1974)
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[1] McCrum NG, Buckley CP, Bucknall CB, "Principle of Polymer Engineering," Oxford University Press, New York (1988)

[2] Kinloch AJ, Shaw SJ, Tod DA, Hunston DC, Polymer, 24, 1341 (1983)

[3] Liu SH, Nauman EB, J. Mater. Sci., 26, 6581 (1991)

[4] Sue HJ, J. Mater. Sci., 31, 275 (1991)

[5] Pearson RA, Yee AF, J. Mater. Sci., 26, 3828 (1991)

[6] Kim JK, Robertson RE, J. Mater. Sci., 27, 161 (1992)

[7] Buchna CB, Partridge IK, Polym. Eng. Sci., 26, 54 (1986)

[8] Kim JK, Robertson RE, J. Mater. Sci., 27, 3000 (1992)

[9] Kubotera K, Yee AF, ANTEC'92, 2610 (1992)

[10] Buchnall CB, Gilbert AH, Polymer, 30, 213 (1989)

[11] Levita G, Petris SD, Marchetti A, Lazzeri A, J. Mater. Sci., 26, 2348 (1991)

[12] Bucknal CB, Patridge IK, Polymer, 24, 639 (1983)

[13] Kim SC, Brown HR, J. Mater. Sci., 22, 2589 (1987)

[14] Reghava RS, J. Polym. Sci. B: Polym. Phys., 26, 65 (1988)

[15] Pearson RA, Yee AF, Polym. Mater. Sci. Eng., 63, 311 (1990)

[16] Scott JM, Wells GM, Phillips DC, J. Mater. Sci., 15, 1436 (1980)

[17] Yamini S, Young RJ, J. Mater. Sci., 14, 1609 (1979)

[18] Phillips DC, Scotts JM, Jones M, J. Mater. Sci., 13, 311 (1978)

[19] Gledhill RA, Kinloch AJ, Yamini S, Young RJ, Polymer, 19, 574 (1978)

[20] Philips DC, Scott JM, J. Mater. Sci. Lett., 9, 1202 (1974)

[21] Hancock P, Cutherson RC, J. Mater. Sci., 5, 762 (1970)

[22] Moloney AC, Kausch HH, Kaiser T, Beer HR, J. Mater. Sci., 22, 381 (1987)

[23] Robertson RE, Mindroiu VE, Polym. Eng. Sci., 27, 55 (1987)

[24] Evans AG, Wiederhoren SM, J. Mater. Sci., 9, 270 (1974)

[25] Irwin GR, Appl. Mater. Res., 3, 65 (1964)