Rheology of Poly lactic acid

The readers of this chapter are expected to come from a wide variety of backgrounds with varying degrees of expertise in polymer materials science. Accordingly, a detailed understanding of the rheological properties of polymers is, for many readers, an unknown subject. With these factors in mind, the first topic to be addressed is. What is rheology and why is it important  

Indeed, the melt rheology of PLA is distinct from other commodity plastics in at least one important respect. Namely, the chemical stability of PLA can be adversely affected rather 

This chapter is organized to provide a short yet detailed understanding of the fundamental rheological properties of PLAs extensive use of references is employed where appropriate. However, the chapter is meant to be self-contained, and so appropriate introductory material is also provided. Properties of the single chain are discussed and related to measurable quantities available from dilute solution viscometry. This is followed by a discussion of the single chain properties of PLA. Next, a brief discussion of the rheology of polymeric materials is provided. In this context, mathematical models are briefly discussed, including the 

Poly(lactic acid) Synthesis, Structures, Properties, Processing, and Applications, edited by R. Auras, L.-T. Lim, S. E. M. Selke, and H. Tsuji Copyright 2010 John Wiley Sons, Inc. 

2 FUNDAMENTAL CHAIN PROPERTIES FROM DILUTE SOLUTION VISCOMETRY 

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J. R. Dorgan, J. S. Wilhams, Melt rheology of poly(lactic acid) entanglement and chain architecture effects. J. Rheology 1999, 43, 1141-1155. 

Lehermeier, H.J., Dorgan, J.R., 2001. Melt rheology of poly(lactic acid) consequences of blending chain architectures. Polym. Eng. Sci. 41, 2172-2184. 

Blends of poly(lactic acid) and poly(butylene-adipate-co-terephthalate) were prepared in the presence of varying concentrations of LlOl RI by ColteUi et al. (2010). The blends were characterized by morphology, rheology, and mechanical properties. 

Dogan et al. (2013) prepared blends of poly(lactic acid) with TPU through addition of 1,4-phenylene diisocyanate coupling agent. Characterization techniques included mechanical, thermal, morphological, and rheological properties. 

Ali, F. Chang, Y. W. Kang, S. C. Yoon, J. Y. Thermal, mechanical and rheological properties of poly(lactic acid)/epoxidized soybean oil blends. Polymer Bulletin, 2009, 62(1), 91-98. 

Hamad, K., Kaseem, M., Deri, F., 2010. Rheological and mechanical properties of poly(lactic acid)/polyst5rrene polymer blend. Polym. Bull. 65, 509-519. 

Bhatia A, Gupta RK, Bhattacharya SN, Choi HJ. An investigation of melt rheology and thermal stability of poly(lactic acid)/poly(butylene succinate) nanocomposites. J Appl Polym Sci 2009 114 2837-47. 

Table 10.1 Melt rheology properties of poly (lactic acid) (Dorgan et aL. 1999)...

Xu, Y. and Qu, J. 2009. Mechanical and rheological properties of epoxidized soybean oil plasticized poly(lactic acid). Journal of Applied Polymer Science 112 3185 - 3191. 

Dorgan, J.R., Jansen, J., Clayton, M.P., 2005. Melt rheology of variable L-content poly(lactic acid). J. Rheol. 49, 607—619. 

Dorgan, J.R., Lehermeier, H., Mang, M., 2000. Thermal and rheological properties of commercial-grade poly(lactic acid)s. J. Polym. Environ. Vol 8, 1—9. 

Batch Foaming of Amorphous Poly (DL-Lactic Acid) and Poly (Lactic Acid-co-Glycolic Acid) with Supercritical Carbon Dioxide CO2 Solubility, Intermolecular Interaction, Rheology and Morphology 135... 

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