Abstract
Management of moisture penetration and hydrolytic degradation of polylactide (PLA) is extremely important during manufacturing, shipping, storage, and end-use of PLA products. Crystallinity in PLA was measured with Differential Scanning Calorimetry (DSC) and X-Ray Diffraction (XRD). Moisture sorption isotherms in PLA films were measured with Quartz Crystal Microbalance (QCM) and Dynamic Vapor Sorption (DVS) experiments with samples of varying crystallinity. A surprising result is that crystalline and amorphous PLA films exhibit nearly identical sorption isotherms, within the accuracy of the experiments. The effect of hydrophobicity of PLA end groups on degradation was evaluated by synthesizing PLA with hydrophobic and hydrophilic end groups.
References
1Perlack, R. D., et al.: Oak Ridge National Laboratory Report ORNL/TM-2005/66, p. 1 (2005)Search in Google Scholar
2Crank, M., et al.: Techno-economic Feasibility of Large-Scale Production of Bio-Based Polymers in Europe (PRO-BIP), Final Report prepared for the European Commision's Insitute for prospective technological Studies, Sevilla, Spain. Utrecht University, Utrecht, Fraunhofer Institute, Karlsruhe (2004)Search in Google Scholar
3Drumright, R. E., Gruber, P. R., Henton, D. E.: Adv. Mater. 12, p. 1841 (2000)10.1002/1521-4095(200012)12:23<1841::AID-ADMA1841>3.0.CO;2-ESearch in Google Scholar
4Vert, M., Schwach, G., Engel, R., Coudane, J.: J. Controlled Release53, p. 85 (1998)10.1016/S0168-3659(97)00240-XSearch in Google Scholar
5Sharp, J. S., Forrest, J. A., Jones, R. A. L.: Macromolecules34, p. 8752 (2001)10.1021/ma011163qSearch in Google Scholar
6Siparsky, G. L., Voorhees, K. J., Dorgan, J. R., Schilling, K.: J. Env. Poly. Deg. 5, p. 125 (1997)Search in Google Scholar
7Auras, R., Harte, B., Selke, S.: J. Appl. Polym. Sci. 92, p. 1790 (2004)10.1002/app.20148Search in Google Scholar
8Auras, R., Harte, B., Selke, S.: Macromolecular Bioscience4, p. 835 (2004)10.1002/mabi.200400043Search in Google Scholar
9Shogren, R.: J. Environ. Polymer Degradation5, p. 91 (1997)10.1007/BF02763592Search in Google Scholar
10Yoon, J. S., Jung, H. W., Kim, M. N., Park, E. S.: J. Appl. Polym. Sci. 77, p. 1716 (2000)10.1002/1097-4628(20000822)77:8<1716::AID-APP8>3.0.CO;2-FSearch in Google Scholar
11Iordanskii, A. L., Kamaev, P. P., Olkhov, A. A., Wasserman, A. M.: Desalination126, p. 139 (1999)10.1016/S0011-9164(99)00166-6Search in Google Scholar
12Olkhov, A. A., Vlasov, S. V., Iordanskii, A. L., Zaikov, G. E., Lobo, V. M. M.: J. Appl. Polym. Sci. 90, p. 1471 (2003)10.1002/app.12614Search in Google Scholar
13Smith, A. L., Wadso, I., Shirazi, H.: Abstracts of Papers of the American Chemical Society216U714–U714 (1998)Search in Google Scholar
14Smith, A. L., Shirazi, H. M., Mulligan, S. R.: Biochimica Et Biophysica Acta-Protein Structure and Molecular Enzymology1594, p. 150 (2002)10.1016/S0167-4838(01)00298-9Search in Google Scholar
15Smith, A. L., Mulligan, R. B., Shirazi, H. M.: Journal of Polymer Science Part B-Polymer Physics42, p. 3893 (2004)10.1002/polb.20243Search in Google Scholar
16Miyata, T., Masuko, T.: Polymer39, p. 5515 (1998)10.1016/S0032-3861(97)10203-8Search in Google Scholar
© 2007, Carl Hanser Verlag, Munich
