Abstract
Polylactides (PLAs) have been known for several decades and have recently gained considerable commercial significance. This development makes it highly desirable to have the rheological properties of these materials well characterized and reduced to useable mathematical models. However, comprehensive rheological characterization of PLAs is not yet available from the literature. In this study, rheological and thermal measurements were made on a comprehensive and well-characterized set of homopolymers and copolymers spanning wide ranges of molecular mass and stereoisomer proportions (L content). For all compositions within the weight average molecular weight range of 105–106(g∕mol) and a reference temperature of 180 °C, the zero shear viscosity is described by the relationship log(η0)=−14.26+3.4log(Mw), the plateau modulus is 1.0±0.2MPa, and average WLF parameters are c1=3.241∕K and c2=164.9K; the later correspond to a Vogel temperature of 288.25 K. The values of the glass transition temperatures at infinit...
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