Segmental Motions and Associated Dynamic Mechanical Thermal Properties of a Series of Copolymers Based on Poly(hexamethylene terephthalate) and Poly(1,4-cyclohexylenedimethylene terephthalate)

Young Gyu Jeong; Sang Cheol Lee; Won Ho Jo

Macromolecular Research, Vol.14, No.4, 416-423, August, 2006

Young Gyu Jeong, Sang Cheol Lee , and Won Ho Jo^{1, †}

School of Advanced Materials and Systems Engineering, Kumoh National Institute of Technology, Kumi 730-701, Korea
¹Hyperstructured Organic Materials Research Center and School of Materials Science and Engineering, Seoul National University, Seoul 151-742, Korea

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The dynamic mechanical thermal properties of poly(hexamethylene terephthalate) (PHT), poly(1,4-cyclohexylenedimethylene terephthalate) (PCT) and their P(HT-co-CT) random copolymers in the amorphous state were examined as a function of temperature and frequency. All the samples exhibited two main relaxation processes in the plot of tan δ versus temperature: the primary α-relaxation associated with the glass transition and the secondary β-relaxation attributed to the local segmental motions of mostly cyclohexylene rings for PCT and to cooperative motions of methylene, carboxyl, and phenylene groups for PHT. Both α- and β-relaxation temperatures increased with increasing CT content. The activation energy of the α-relaxation increased with increasing CT content, whereas that of the β-relaxation decreased. The sub-glassy secondary β-relaxation processes of PCT and PHT were investigated in terms of the cooperativity of main-chain segmental motions.

Keywords:dynamic mechanical thermal property;segmental motion;activation energy

[References]

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Jeong YG, Jo WH, Lee SC, Macromol. Res., 12, 459 (2004)
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[1] Farrow G, McIntosh J, Ward IM, Makromol. Chem., 38, 147 (1960)

[2] Bateman J, Richards RE, Farrow G, Ward IM, Polymer, 1, 63 (1960)

[3] Hall IH, Ibrahim BA, Polymer, 23, 805 (1982)

[4] Palmer A, Poulin-Dandurand S, Revol JF, Brisse F, Eur. Polym. J., 20, 783 (1984)

[5] Brisse F, Palmer A, Moss B, Dorset D, Roughead WA, Miller DP, Eur. Polym. J., 20, 791 (1984)

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[8] Kibler CJ, Bell A, Smith JG, U. S. Patent 2901466 (1959)

[9] Boye CA, J. Polym. Sci., 55, 263 (1961)

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

[11] Reddish W, Pure Appl. Chem., 5, 723 (1962)

[12] Kibler CJ, Bell A, Smith JG, J. Polym. Sci. A: Polym. Chem., 2, 2115 (1964)

[13] Hiltner A, Baer E, J. Macromol. Sci.-Phys., B6, 545 (1972)

[14] Remillard B, Brisse F, Polymer, 23, 1960 (1982)

[15] Chen LP, Yee AF, Goetz JM, Schaefer J, Macromolecules, 31(16), 5371 (1998)

[16] Jeong YG, Jo WH, Lee SC, Macromol. Res., 12, 459 (2004)

[17] McCrum NG, Read BE, Williams G, Anelastic and Dielectric Effects in Polymeric Solids, John Wiley & Sons, Inc., New York, 1967

[18] Murayama T, Dynamic Mechanical Analysis of Polymeric Material, Elsevier, New York, 1978

[19] Ferry JD, Viscoelastic Properties of Polymers, 3rd ed., John Wiley & Sons, Inc., New York (1980)

[20] Nielsen LE, Landel RF, Mechanical Properties of Polymers and Composites, 2nd ed., Marcel Dekker, Inc., New York (1994)

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[22] Chen LP, Yee AF, Moskala EJ, Macromolecules, 32(18), 5944 (1999)

[23] Woodward AE, Crissman JM, Sauer JA, J. Polym. Sci., 44, 23 (1960)

[24] Illers KH, Breuer H, J. Colloid Sci., 18, 1 (1963)

[25] Wippler C, Polym. Eng. Sci., 33, 347 (1993)

[26] Jeong YG, Jo WH, Lee SC, Polymer, 45(10), 3321 (2004)

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[31] Garbow JR, Schaefer J, Macromolecules, 20, 819 (1987)

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[33] Jeong YG, Jo WH, Lee SC, Macromolecules, 33(26), 9705 (2000)

[34] Fox TG, Bull. Am. Phys. Soc., 1, 123 (1956)

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[36] Angell CA, Ngai KL, McKenna GB, McMillan PF, Martin SW, J. Phys., 88, 3113 (2000)

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[39] Starkweather HW, Macromolecules, 14, 1277 (1981)

[40] Starkweather HW, Macromolecules, 21, 1798 (1988)

[41] Starkweather HW, Polymer, 32, 2443 (1991)