열처리 조건에 따른 폴리(에틸렌 테레프탈레이트)의 열적 특성 및 결정화 거동

류민영; 배유리; Min-Young Lyn; Youlee Pae

Polymer(Korea), Vol.27, No.2, 113-119, March, 2003

Export Citation

열처리 조건에 따른 폴리(에틸렌 테레프탈레이트)의 열적 특성 및 결정화 거동

Thermal Properties and Crystallization Behaviors of Poly(ethylene terephthalate) at Various Annealing Conditions

류민영^†, 배유리¹

서울산업대학교 금형설계학과 정밀기계기술연구소
¹(주)아담스 테크놀로지

Min-Young Lyn^†, and Youlee Pae¹

Department of Die & Mould Design Institute of Precision Machnery Technology, Seoul National Univ. of Technology, 172 Gongreung 2-dong, Nowon-gu, Seoul 139-743, Korea
¹ADMS-TECH Co., LTd., Korea

E-mail:

초록

폴리(에틸렌 테레프탈레이트) (PET)의 열처리 조건들 즉, 상대 습도, 온도 그리고 시간 등에 따라 나타나는 PET의 열적 특성과 결정화 거동에 대해서 연구하였다. PET샘플에 열처리를 수행한 후 수분 함유량, 유리 전이온도(T_g), 그리고 결정화 온도(T_cc)등의 변화를 조사하였다. 그리고 열처리된 PET시편에 대해서 결정화를 시키고 결정화도에 따른 열변형 온도(HDT)를 측정하였다. 또한 사출 성형으로 제작된 PET샘플의 열처리 후 잔류 응력의 완화를 편광 필름을 통하여 조사하였다. 열처리 시의 상대 습도, 온도, 그리고 시간이 증가함에 따라 PET샘플 내의 수분 함유량은 최대 6000 ppm이상 까지 증가하였다. T_g와 T_c는 시편 내에 수분 함유량이 증가할수록 감소하였다. PET샘플의 결정화도는 수분의 함유량이 증가함에 따라 증가되었다. 그러나 같은 양의 수분 함량에서 결정화도는 열처리의 조건에 따라 다르게 나타났다. PET샘플 내의 잔류응력의 완화는 열처리 조건에 따라 다르게 나타났으며, PET샘플 내에 잔류 응력이 감소할수록 최대 결정화도는 증가하였다.

The thermal properties and crystallization behaviors of poly(ethylene terephthalate) (PET) were investigated by controlling the annealing conditions of PET sample, such as relative humidity, temperature, and time. The variations of moisture content, glass transition temperature (T_g) and cold crystallization temperature (T_cc) were examined after annealing the PET sample. Subsequently crystallization process was performed with the annealed PET specimen, and then the degree of crystallinity and heat distortion temperature (HDT) of variously crystallized PET specimen were examined. Residual stress relaxation in the injection molded PET sample after annealing was also observed through polarized films. Moisture content in the PET specimen increased up to 6000 ppm with increasing the relative lumidity, temperature, and time of annealing. T_g and T_cc of the annealed PET specimen decreased with increasing moisture content. The degree of crystallinity increased as increasing moisture content in the PET specimen, However for same moisture content, the degree of crystallinity varied with annealing conditions. The relaxations of residual stress in the PET sample differed from annealing conditions, and the maximum degree of crystallinity increased with decreasing residual stress in the PET sample.

Keywords:poly(ethylene terephthalate);moisture content;glass transition temperature;crystallization temperature;degree of crystallinity

[References]

Bonnebat C, Roullet G, DeVries AJ, Polym. Eng. Sci., 21, 189 (1981)
Erwin L, Pollock MA, Gonzalez H, Polym. Eng. Sci., 23, 826 (1983)
Cakmak M, Spruiell JE, White JL, Polym. Eng. Sci., 24, 1390 (1984)
Leigner FP, Plast. Eng., 41, 47 (1985)
Drunnschweiler D, Hearle J, Polyester, The Textile Institute, Manchester (1993)
DeLorenzi HG, Taylor CA, Int. Polym. Process., 8, 365 (1993)
Lyu MY, Kim HC, Lee Js, Shin HC, Abstracts, Polymer Society of Korea, 25(1), 14 (2000)
McCrum NG, Buckley CP, Bucknall CB, Principles of Polymer Engineering, 2nd Ed., Oxford University Press, NY (1997)
Osswald TA, Menges G, Materials Science of Polymers for Engineers, Hanser, NY (1996)
Jabarin SA, Lofgren EA, Polym. Eng. Sci., 26, 620 (1986)
Jabarin SA, J. Appl. Polym. Sci., 34, 103 (1987)
Allen NS, Edge M, Mohammadian M, Eur. Polym. J., 27, 1373 (1991)
Bianchi R, Chiavacci P, Vosa R, Guerra G, J. Appl. Polym. Sci., 43, 1087 (1991)
Jog JP, J. Macromol. Sci.-Rev. Macromol. Chem. Phys., C35(3), 531 (1995)
Zimmerman H, Kim NT, Polym. Eng. Sci., 20, 680 (1980)
Jabarin SA, J. Appl. Polym. Sci., 34, 85 (1987)
Jabarin SA, J. Appl. Polym. Sci., 34, 97 (1987)
Chen Y, Lin Z, Yang S, J. Therm. Anal., 52, 565 (1998)
Dumeleton JH, J. Polym. Sci., 6, 795 (1968)
Jabarin SA, Polym. Eng. Sci., 32, 1341 (1992)
Rietsch F, Eur. Polym. J., 26, 1077 (1990)
Thompson M, White JL, Polym. Eng. Sci., 24, 227 (1984)
Isayev AI, Grouthamel DL, Polym. Plast. Technol. Eng., 22(2), 177 (1984)

[Referenced By]

[1] Bonnebat C, Roullet G, DeVries AJ, Polym. Eng. Sci., 21, 189 (1981)

[2] Erwin L, Pollock MA, Gonzalez H, Polym. Eng. Sci., 23, 826 (1983)

[3] Cakmak M, Spruiell JE, White JL, Polym. Eng. Sci., 24, 1390 (1984)

[4] Leigner FP, Plast. Eng., 41, 47 (1985)

[5] Drunnschweiler D, Hearle J, Polyester, The Textile Institute, Manchester (1993)

[6] DeLorenzi HG, Taylor CA, Int. Polym. Process., 8, 365 (1993)

[7] Lyu MY, Kim HC, Lee Js, Shin HC, Abstracts, Polymer Society of Korea, 25(1), 14 (2000)

[8] McCrum NG, Buckley CP, Bucknall CB, Principles of Polymer Engineering, 2nd Ed., Oxford University Press, NY (1997)

[9] Osswald TA, Menges G, Materials Science of Polymers for Engineers, Hanser, NY (1996)

[10] Jabarin SA, Lofgren EA, Polym. Eng. Sci., 26, 620 (1986)

[11] Jabarin SA, J. Appl. Polym. Sci., 34, 103 (1987)

[12] Allen NS, Edge M, Mohammadian M, Eur. Polym. J., 27, 1373 (1991)

[13] Bianchi R, Chiavacci P, Vosa R, Guerra G, J. Appl. Polym. Sci., 43, 1087 (1991)

[14] Jog JP, J. Macromol. Sci.-Rev. Macromol. Chem. Phys., C35(3), 531 (1995)

[15] Zimmerman H, Kim NT, Polym. Eng. Sci., 20, 680 (1980)

[16] Jabarin SA, J. Appl. Polym. Sci., 34, 85 (1987)

[17] Jabarin SA, J. Appl. Polym. Sci., 34, 97 (1987)

[18] Chen Y, Lin Z, Yang S, J. Therm. Anal., 52, 565 (1998)

[19] Dumeleton JH, J. Polym. Sci., 6, 795 (1968)

[20] Jabarin SA, Polym. Eng. Sci., 32, 1341 (1992)

[21] Rietsch F, Eur. Polym. J., 26, 1077 (1990)

[22] Thompson M, White JL, Polym. Eng. Sci., 24, 227 (1984)

[23] Isayev AI, Grouthamel DL, Polym. Plast. Technol. Eng., 22(2), 177 (1984)