Azomethine 기를 가지는 신소재 액정 에폭시 (LCE)와 지방족 아민의 경화반응

김상욱; S.W. Kim

Korean Journal of Materials Research, Vol.11, No.9, 786-791, September, 2001

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Azomethine 기를 가지는 신소재 액정 에폭시 (LCE)와 지방족 아민의 경화반응

Curing Reaction of Noble Liquid Crystalline Epoxy (LCE) with Azomethine/Aliphatic Amine

김상욱

서울시립대학교 화학공학과

S.W. Kim

Department of Chemical Engineering, The University of Seoul, Seoul, 130-743, Korea

α , ω -Bis(4-glycidyloxybenzylidene-4-aminophenyl)methane (BGBAM) was synthesized from the initial materials, 4-hydroxylbenzaldehyde (HBA), 4,4'-methylenedianiline (MDA) and epichlorohydrin. The DSC trace for BGBAM shows two endotherms associated with the liquid crystalline phase transition around 104.2 ? C and the isotropic transition around 171.2 ? C , and it also has a broad exotherm in the range of 178 300 ? C due to the anionic homopolymerization of BGBAM. DSC curve for the curing of BGBAM with hexamethylene diamine (HMD) shows an endothermic peak around 93 ? C attributed to the melting of BGBAM. It also has three exothermic peaks around 128.4 ? C and 180.2 ? C associated with the epoxide-amine reaction and weak peak in the range of 200 263 ? C related to the anionic homopolymerization between the unreacted epoxide groups. The activation energy values of cure reaction by Kissinger method are 66.5, 67.3 and 90.6 kJ/mol for T pl ,T p2 andT p3 ,respectively . The kinetic parameters by isoconverional method are similar value to those from Kissinger method.

Keywords:liquid crystalline epoxy;Kissinger method;isoconversional method;cure kinetics;azomethine

[References]

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Lu M, Kim S, Shim M, Korea Polym. J., 7(5), 304 (1999)
Lee JY, Shim MJ, Kim SW, Thermochim. Acta, 371(1-2), 45 (2001)
Lee JY, Shim MJ, Kim SW, J. Mater. Sci., 35(14), 3529 (2000)
Ozawa T, Bull. Chem. Soc. Jpn., 38, 1881 (1965)
Flynn JH, J. Therm. Anal., 27, 95 (1983)
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Mormann W, Brocher M, Macromol. Chem. Phys., 199, 1935 (1998)

[1] Mark JE, “ Physical Properties of Polymers Handbook", AIP Press, New York, Ch.33 (1996).

[2] Lee JY, Jang JS, Hong SM, Hwang SS, Kim KU, Polymer, 40(11), 3197 (1999)

[3] US Pats., 3,869,429 and 3,869,430, Blades H ( de Nemouers EIDP & Co., Inc.) (1975).

[4] Chung TS, Polym. Eng. Sci., 26, 901 (1986)

[5] Higgs PG, Ball RC, Macromolecules, 22, 2432 (1989)

[6] Aharoni SM, Edwards SF, Macromolecules, 22, 3361 (1989)

[7] Warner M, Wang XJ, Macromolecules, 24, 4932 (1991)

[8] Mormann W, Kuckerlz C, Macromol. Chem. Phys., 199, 845 (1998)

[9] Lu M, Kim S, Shim M, Korea Polym. J., 7(5), 304 (1999)

[10] Lee JY, Shim MJ, Kim SW, Thermochim. Acta, 371(1-2), 45 (2001)

[11] Lee JY, Shim MJ, Kim SW, J. Mater. Sci., 35(14), 3529 (2000)

[12] Ozawa T, Bull. Chem. Soc. Jpn., 38, 1881 (1965)

[13] Flynn JH, J. Therm. Anal., 27, 95 (1983)

[14] Li XG, Huang MR, Polym. Degrad. Stabil., 64, 81 (1999)

[15] Lee JY, Shim MJ, Kim SW, Mater. Chem. Phys., 44, 74 (1996)

[16] Ege SN, “ Organic Chemistry" , D.C. Heath and Company, (1984) p385.

[17] Mormann W, Brocher M, Macromol. Chem. Phys., 199, 1935 (1998)