랜덤 공중합체의 화학구조가 결정화거동에 미치는 효과

유희열; 김상욱; Okui N

Polymer(Korea), Vol.17, No.6, 630-636, November, 1993

Export Citation

랜덤 공중합체의 화학구조가 결정화거동에 미치는 효과

Effect of Chemical Structure on Crystallization Behavior in Random Copolymers

유희열, 김상욱, Okui N

초록

에틸렌 테레프탈레이트-1,4-시클로헥실렌 디메틴렌 테레프탈레이트 공증합체, p(ET-CT)의 화학구조가 결정화 거동에 미치는 효과를 DSC 분석을 통하여 조사하였다. 공중합체의 용융온도, 결정화도 및 결정화 속도는 공중합 조건이 증가됨에 따라 감소하였고 34몰%의 CT조성에서는 결정화가 진행되지 않아서 이들 특성치를 관측할 수 없었다. 이리한 랜덤 공중합체의 결정화 특성을 평균 연쇄에 근거한 임계 결정성 연쇄 길이(the critical crystallizable sequence length)를 통하여 해결할 수 있었다. 34몰%의 CT조성을 갖는 공중합체의 비결정성은, 평균 연쇄 길이가 임계 결정성 연쇄길이보다 짧기 때문인 것으로 설명할 수 있었다.

The effects of chemical structure on crystallization behavior in poly(ethylene terephthalate-co- 1,4-cyclohexylene dimethylene terephthalata), P(ET-CT) copolymars were investigated by DSC analysis. The melting temperature, crystallinity and crystallization rate in the copolymers decreased with an increase of the copolymer composition. However, the copolymer of 34 mole % CT was obseryed not to crystallize. Such crystallization behavior in the random copolymers could by discussed sucessfully with the critical crystallizable sequence length based on the averaged sequence. Non-crystal-lizability of the copolymer containing 34 mol % CT coo]d be explained with its average sequence length shorter than the critical crystallizable sequence length.

[References]

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[1] Miesiri W, Menczel J, Gaur U, Wunderich B, J. Polym. Sci. B: Polym. Phys., 20, 719 (1982)

[2] Kamiya N, Sakurai M, Inoue Y, Chujo R, Doi Y, Macromolecules, 24, 2178 (1991)

[3] Nakamura S, Doi Y, Scandola M, Macromolecules, 25, 4237 (1992)

[4] Hachiboshi M, Fukuda T, Kobayashi S, J. Macromol. Sci.-Phys., 3, 525 (1969)

[5] Ueberreiter K, Steiner N, Makromol. Chem., 74, 158 (1964)

[6] Wunderich B, Macromolecular Physics, Vol. 1, Chap. 2.4.8, Academic Press (1973)

[7] Yoo HY, Umemoto S, Kikutani T, Okui N, Polym. Prepr. Jpn., 41, 1359 (1992)

[8] Yoo HY, Kim SW, Okui N, in press

[9] Yagpharov M, J. Thermal Anal., 31, 1073 (1986)

[10] Lin SB, Koenig JL, J. Polym. Sci. Polym. Symp., 71, 121 (1984)

[11] Wunderich B, Vol. 2, Chap. 6.1.6, Academic Press (1973)

[12] Boye CA, J. Polym. Sci., 55, 275 (1961)

[13] Fakirov S, Fisher EW, Schmidt GF, Makromol. Chem., 176, 2459 (1975)

[14] Yoo HY, Umemoto S, Kikutani T, Okui N, Polymer, accepted (1993)

[15] Bovey FA, Tiers GBD, J. Polym. Sci., 44, 173 (1960)

[16] Alamo RG, Glaser RH, Mandelkern L, J. Polym. Sci. B: Polym. Phys., 26, 2129 (1988)

[17] Flory PJ, Trans. Faraday Soc., 51, 848 (1955)

[18] Yosie N, Inoue Y, Yoo HY, Okui N, Polym. Prepr., 41, 1360 (1992)