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Impact of Humid Environment on Structural and Mechanical Properties of Biobased Polylactide

  • A. Jaszkiewicz , A. K. Bledzki and A. Meljon
Published/Copyright: August 11, 2015
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Abstract

The study focused on the material behavior of two commercial polylactide grades affected by structural changes due to exposure to humid environment. Additionally, the impact of temperature and environment humidity on the moisture uptake and drying process of polymer granulate was examined to evaluate the necessary pre-treatment conditions prior to the polylactide processing. Also some process relevant aspects, such as the impact of polymer pre-drying on its degradation were characterised. In the first part of the experimental work, moisture absorption mechanisms in relation to conditioning parameters were investigated using Karl Fischer titration method. It was shown that the moisture uptake rate correlates with temperature and humidity of the environment. Furthermore, the drying process of polylactide pellets was conducted and analysed by additional melt flow rate measurements to determine the effect of drying conditions on the premature polymer degradation and melt properties. Investigated polymers demonstrated rheological behavior dependent not only on the residual moisture content, but also on drying temperature and time. In the last section of the study flexural and tensile tests were performed in order to determine the influence of moisture uptake on the characteristics of conditioned polylactide. Mechanical strength of polylactide decreased in both, flexural and tensile tests with increasing moisture content in the samples. Moreover, distinctive differences in polylactide mechanical behavior were observed in both tests.


* Mail address: Agnieszka Meljon, West Pomeranian University of Technology Szczecin, Institute of Materials Science and Engineering, Piastów 19 Ave, 70310 Szczecin, Poland, E-mail:

References

Al-Itry, R., Khalid Lamnawar, K. and Maazouz, A., “Improvement of Thermal Stability, Rheological and Mechanical Properties of PLA, PBAT and their Blends by Reactive Extrusion with Functionalized Epoxy”, Polym. Degrad. Stab., 97, 18981914 (2012) 10.1016/j.polymdegradstab.2012.06.028Search in Google Scholar

Auras, R., Harte, B. and Selke, S., “An Overview of Polylactides as Packaging Materials”, Macromol. Biosci., 4, 835864 (2004) 10.1002/mabi.200400043Search in Google Scholar

Broughton, W. R., “Chapter No. 8 Through-Thickness Testing, Mechanical Testing of Advanced Fibre Composites”, Hodgkinson, J. M. (Ed.), Woodhead Publishing, Abington Cambridge, p. 143169 (2002)Search in Google Scholar

Chen, H.-M., Shen, Y., Yang, J.-H., Huang, T., Zhang, N., Wang, Y. and Zhou, Z.-W., “Molecular Ordering and Α’-Form Formation of Poly(L-lactide) during the Hydrolytic Degradation”, Polymer, 54, 66446653 (2013) 10.1016/j.polymer.2013.09.059Search in Google Scholar

Chu, C. C., “Degradation Phenomena of Two Linear Aliphatic Polyester Fibres Used in Medicine and Surgery”, Polymer, 26, 591594 (1985) 10.1016/0032-3861(85)90160-0Search in Google Scholar

Codari, F., Lazzari, S., Soos, M., Storti, G., Morbidelli, M. and Moscatelli, D., “Kinetics of the Hydrolytic Degradation of Poly(lactic acid)”, Polym. Degrad. Stab., 97, 24602466 (2012) 10.1016/j.polymdegradstab.2012.06.026Search in Google Scholar

Fischer, E. W., Sterzel, H. J. and Wegner, G., “Investigation of the Structure of Solution Grown Crystals of Lactide Copolymers by Means of Chemical Reactions”, Kolloid-Zeitschrift und Zeitschrift für Polymere, 251, 980990 (1973) 10.1007/BF01498927Search in Google Scholar

Gilding, D. K., Reed, A. M., “Biodegradable Polymers for Use in Surgery-Polyglycolic/Poly(actic acid) Homo- and Copolymers: 1”, Polymer, 20, 14591464 (1979) 10.1016/0032-3861(79)90009-0Search in Google Scholar

Jacobsen, S., “Darstellung von Polylactiden mittels Reaktiver Extrusion“, PhD Thesis, Institut für Kunststofftechnologie, Universität Stuttgart, Stuttgart (2000)Search in Google Scholar

Jaszkiewicz, A., Bledzki, A. K. and Meljon, A., “Online Observations and Process Analysis of Chain Extended Polylactides during Injection Moulding”, Polym. Degrad. Stab., 101, 6570 (2014a) 10.1016/j.polymdegradstab.2014.01.009Search in Google Scholar

Jaszkiewicz, A., Bledzki, A. K., Duda, A., Galeski, A. and Franciszczak, P., “Investigation of Processability of Chain-Extended Polylactides during Melt Processing – Compounding Conditions and Polymer Molecular Structure”, Macromol. Mater. Eng., 299, 307318 (2014b) 10.1002/mame.201300115Search in Google Scholar

Kutz, M.: Handbook of Materials Selection, John Wiley & Sons, New York (2002) 10.1002/9780470172551Search in Google Scholar

Lim, L.-T., Auras, R. and Rubino, M., “Processing Technologies for Poly(lactic acid)”, Prog. Polym. Sci., 33, 820852 (2008) 10.1016/j.progpolymsci.2008.05.004Search in Google Scholar

Madhavan Nampoothiri, K. M., NairN. R. and JohnR. P., “An Overview of the Recent Developments in Polylactide (PLA) Research”, Bioresour. Technol., 101, 84938501 (2010) 10.1016/j.biortech.2010.05.092Search in Google Scholar

Rasal, R. M., Janorkar, A. V. and Hirt, D. E., “Poly(lactic acid) Modifications”, Prog. Polym. Sci., 35, 338356 (2010) 10.1016/j.progpolymsci.2009.12.003Search in Google Scholar

Rasselet, D., Ruellan, A., Guinault, A., Miquelard-Garnier, G., Sollogoub, C. and Fayolle, B., “Oxidative Degradation of Polylactide (PLA) and its Effects on Physical and Mechanical Properties”, Eur. Polym. J., 50, 109116 (2013) 10.1016/j.eurpolymj.2013.10.011Search in Google Scholar

Reddy, M. M., Vivekanandhan, S., Misra, M., Bhatia, S. K. and Mohanty, A. K., “Biobased Plastics and Bionanocomposites: Current Status and Future Opportunities”, Prog. Polym. Sci., 38, 16531689 (2013) 10.1016/j.progpolymsci.2013.05.006Search in Google Scholar

Rosato, D. V., Schott, N. R. and Rosato, M. G., “Chapter No. 4 Designing Products, Plastics Engineering, Manufacturing & Data Handbook”, Rosato, D. V., Schott, N. R., Rosato, M. G. (Eds.), Springer, Berlin, Heidelberg, p. 12451469 (2001)10.1007/978-1-4615-1615-6_22Search in Google Scholar

Santonja-Blasco, L., Ribes-Greus, A. and Alamo, R. G., “Comparative Thermal, Biological and Photodegradation Kinetics of Polylactide and Effect on Crystallization Rates”, Polym. Degrad. Stab., 98, 771784 (2013) 10.1016/j.polymdegradstab.2012.12.012Search in Google Scholar

Signori, F., Coltelli, M.-B. and Bronco, S., “Thermal Degradation of Poly(lactic acid) (PLA) and Poly(butylene adipate-co-terephthalate) (PBAT) and their Blends upon Melt Processing”, Polym. Degrad. Stab., 94, 7482 (2009) 10.1016/j.polymdegradstab.2008.10.004Search in Google Scholar

Södergård, A., Stolt, M., “Properties of Lactic Acid Based Polymers and their Correlation with Composition”, Prog. Polym. Sci., 27, 11231163 (2002) 10.1016/S0079-6700(02)00012-6Search in Google Scholar

Taubner, V., Shishoo, R., “Influence of Processing Parameters on the Degradation of Poly(L-lactide) during Extrusion”, J. Appl. Polym. Sci., 79, 21282135 (2001) 10.1002/1097-4628(20010321)79:12<2128::AID-APP1020>3.0.CO;2-#Search in Google Scholar

Vegt van der, A. K.: From Polymers to Plastics, Blue Print, Delft University Press, Delft (2002)Search in Google Scholar

Villalobos, M., Awojulu, A., Greeley, T., Turco, G. and Deet, G., “Oligomeric Chain Extenders for Economic Reprocessing and Recycling of Condensation Plastics”, Energy, 31, 32273234 (2006) 10.1016/j.energy.2006.03.026Search in Google Scholar

Zhang, X., Espiritu, M., Bilyk, A. and Kurniawan, L., “Morphological Behaviour of Poly(lactic acid) during Hydrolytic Degradation”, Polym. Degrad. Stab., 93, 19641970 (2010) 10.1016/j.polymdegradstab.2008.06.007Search in Google Scholar

Received: 2015-03-16
Accepted: 2015-06-01
Published Online: 2015-08-11
Published in Print: 2015-08-14

© 2015, Carl Hanser Verlag, Munich

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