Characterization of Bacterial Copolyesters with Unsaturated Pendant Groups - Effect of Eposidation on Thermal Degradation -

Park WH; Lee MY

Korea Polymer Journal, Vol.6, No.3, 219-224, August, 1998

Park WH, Lee MY

The thermal decomposition behavior of poly(3-hydroxyoctanoate-co-3-hydroxyundec-10-enoate)s (PHOUs) and their partially epoxidized products (PHOUEs) have been studied by thermogravimetric analysis and differential scanning calorimetry. The thermograms of epoxidized PHOUSs showed three-step egradation, while that of PHOU exhibits one-step degradation. The higher thermal stability of PHOUEs might be due to the crosslinking reactions caused by pendant epoxide groups in the copolymer during the degradation process. Crosslinking reactions were confirmed by the expthermic peak on DSC thermogram. From the isothermal study at 250 ℃, the residual weight appears to be directly correlated with the amount of epoxide groups introduced into PHOUs.

[References]

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Park WH, Lenz RW, Goodwin S, Macromolecules, 31(5), 1480 (1998)
Park WH, Lenz RW, Goodwin S, J. Polym. Sci. A: Polym. Chem., in press
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[1] Grassie N, Murry EJ, Holms PA, Polym. Degrad. Stabil., 6, 47 (1984)

[2] Grassie N, Murry EJ, Holms PA, Polym. Degrad. Stabil., 6, 95 (1984)

[3] Grassie N, Murry EJ, Holms PA, Polym. Degrad. Stabil., 6, 127 (1984)

[4] Gogolewski S, Jovanovic M, Perren SM, Dillon JG, Hughes MK, Polym. Degrad. Stabil., 40, 313 (1993)

[5] Csomorova K, Rychly J, Bakos D, Janigova I, Polym. Degrad. Stabil., 43, 441 (1994)

[6] Billingham NC, Henman TJ, Holmes PA, Developments in Polymer Degradation, ed. N. Grassie, Elsevier Applied Science, London, p. 81 (1987)

[7] Park WH, Lenz RW, Goodwin S, Macromolecules, 31(5), 1480 (1998)

[8] Park WH, Lenz RW, Goodwin S, J. Polym. Sci. A: Polym. Chem., in press

[9] Grassie N, Murray EJ, Holmes PA, Polym. Degrad. Stabil., 6, 95 (1984)

[10] Rode VV, Verkhotin MA, Rafikov SR, Eur. Polym. J., 401 (1969)

[11] Grassie N, MacFarlane IG, Eur. Polym. J., 14, 875 (1978)

[12] Thomas TH, Kendrick TG, J. Polym. Sci. A: Polym. Chem., 7, 537 (1969)

[13] Peebles LH, Huffman MH, J. Polym. Sci. A: Polym. Chem., 9, 1807 (1971)