사슬구조가 다른 폴리에스터카보네이트들의 Notch 민감성

조재영; 민성식

Polymer(Korea), Vol.20, No.3, 419-426, May, 1996

Export Citation

사슬구조가 다른 폴리에스터카보네이트들의 Notch 민감성

Notch Sensitivity of Polyestercarbonates with Different Chain Structures

조재영, 민성식

초록

엔지니어링 플라스틱들의 notch 민감성의 원인을 규명하려는 목적으로 사슬구조가 다른 폴리에스터카보네이트(PEC)들을 합성하고 이들의 notch 민감성을 살펴보았다. Notch 민감성이 큰 고분자들의 사슬 구조가 그렇지 않은 고분자들에 비해 선형적인 것에 주목하여, 선형인 PC의 사슬 구조에 terephthalate, isophthalate, phthalate기를 도입하여 사슬의 구부러진 정도와 notch 민감성의 관계를 관찰하였다. 용액 축중합을 통해 PEC들을 합성하였으며, 이차완화운동을 보장하기 위해 충분히 긴 PC의 반복단위를 확보하였다. Notch 반지름을 다르게한 파괴강인성 측정 결과, 사슬의 구부러진 정도와 notch 민감성의 관계를 확인하였다. 구부러진 구조의 isophthalate, phthalate기를 포함한 PEC들이 선형의 terephthalate기를 포함한 PEC에 비해 notch 민감성이 더 작음을 관찰하였다.

To study the origin of notch sensitivity observed in engineering plastics, notch sensitivities of the polyestercarbonates (PEC) with different chain structures were examined. Based on the observation that the chain structures of notch sensitive polymers are generally linear, it was assumed that the notch sensitivities of PECs would be dependent on the chain structures. PECs with terephthalate, isophthalate, and phthalate groups were prepared by solution copolycondensation method. The number of carbonate repeat units between ester groups was maintained over seven to enable the secondary relaxation motion. Fracture toughness test results with the specimens having different notch tip radii showed that the notch sensitivity of PEC is related to the linearity of chain structure. The notch sensitivities of PECs with isophtalate and phthalate groups were lower than that of PEC with terephthalte group.

Keywords:polycarbonate;polyestercarboante;notch sensitivity;fracture toughness

[References]

Brydson JA, "Plastics Materials," 5th Ed., Chap. 20, Butterworths, London (1989)
Ulrich H, "Introduction to Industrial Polymers," 2nd Ed., p. 128, Hanser, Munich (1993)
Ward IM, "Mechanical Properties of Solid Polymers," 2nd Ed., Chapt. 12, Wiley, Chichester (1981)
ASTM Standards, American Society for Testing Materials, D256-92 (1992)
Vincent PI, Kinloch AJ, Young RJ, "Fracture Behaviour of Polymers," Chap. 6, Applied Science Publishers, London (1983)
Plati E, Williams JG, Polym. Eng. Sci., 15, 470 (1975)
Takano M, Neilsen LE, J. Appl. Polym. Sci., 20, 2193 (1976)
Wu S, Polym. Eng. Sci., 30, 753 (1990)
Bicerano J, Clark HA, Macromolecules, 21, 585 (1988)
Bicerano J, Clark HA, Macromolecules, 21, 597 (1988)
Cervinka L, Fischer EW, J. Non-Cryst. Solids, 106, 343 (1988)
Erman B, Marvin DC, Ervin PA, Macromolecules, 15, 664 (1982)
Miller RL, Boyer RF, Heijboer J, J. Polym. Sci. B: Polym. Phys., 22, 2021 (1984)
Mitchell GR, Windle AH, Polymer, 25, 906 (1984)
Mitchell GR, "Order in the Amorphous 'State' of Polymers," Eds. by S.E. Keinath, R.C. Miller, and J.K. Rieke, p. 1-31, Plenum, New York (1987)
ASTM Standards, American Society for Testing Materials, E399-92 (1992)
Jho JY, Yee AF, Macromolecules, 24, 1905 (1991)
Xiao C, Yee AF, Macromolecules, 25, 6800 (1992)
Coulter P, Windle AH, Macromolecules, 22, 1129 (1989)

[1] Brydson JA, "Plastics Materials," 5th Ed., Chap. 20, Butterworths, London (1989)

[2] Ulrich H, "Introduction to Industrial Polymers," 2nd Ed., p. 128, Hanser, Munich (1993)

[3] Ward IM, "Mechanical Properties of Solid Polymers," 2nd Ed., Chapt. 12, Wiley, Chichester (1981)

[4] ASTM Standards, American Society for Testing Materials, D256-92 (1992)

[5] Vincent PI, Kinloch AJ, Young RJ, "Fracture Behaviour of Polymers," Chap. 6, Applied Science Publishers, London (1983)

[6] Plati E, Williams JG, Polym. Eng. Sci., 15, 470 (1975)

[7] Takano M, Neilsen LE, J. Appl. Polym. Sci., 20, 2193 (1976)

[8] Wu S, Polym. Eng. Sci., 30, 753 (1990)

[9] Bicerano J, Clark HA, Macromolecules, 21, 585 (1988)

[10] Bicerano J, Clark HA, Macromolecules, 21, 597 (1988)

[11] Cervinka L, Fischer EW, J. Non-Cryst. Solids, 106, 343 (1988)

[12] Erman B, Marvin DC, Ervin PA, Macromolecules, 15, 664 (1982)

[13] Miller RL, Boyer RF, Heijboer J, J. Polym. Sci. B: Polym. Phys., 22, 2021 (1984)

[14] Mitchell GR, Windle AH, Polymer, 25, 906 (1984)

[15] Mitchell GR, "Order in the Amorphous 'State' of Polymers," Eds. by S.E. Keinath, R.C. Miller, and J.K. Rieke, p. 1-31, Plenum, New York (1987)

[16] ASTM Standards, American Society for Testing Materials, E399-92 (1992)

[17] Jho JY, Yee AF, Macromolecules, 24, 1905 (1991)

[18] Xiao C, Yee AF, Macromolecules, 25, 6800 (1992)

[19] Coulter P, Windle AH, Macromolecules, 22, 1129 (1989)