Modeling Melt Spinning of PLA Fibers

Autor: William H. Kohler, Anthony J. McHugh, P. Shrikhande
Rok vydání: 2005
Předmět:
Zdroj: Journal of Macromolecular Science, Part B. 44:185-202
ISSN: 1525-609X
0022-2348
DOI: 10.1081/mb-200049786
Popis: A modified version of a model for fiber spinning was developed for poly(lactic acid) (PLA) based on earlier models that predicted the spinline behavior of poly(ethylene terephthalate) (PET) and Nylon 6.6. Comparisons were made to melt‐spinning data of Takasaki and coworkers for high lactic acid (L)‐content PLA (PLLA) and racemic mixtures of the L‐ and D‐ forms over a range of spin speeds from high‐ to low‐speed conditions. The characteristic necking and “freeze off” under high‐speed conditions is not as severe with PLA as that observed in the earlier model systems, most likely due to the more highly entangled nature of PLA. To address this, the extended pom‐pom model was utilized to model the melt phase. Because of the stereochemistry of PLA, mixtures of the L‐ and D‐ forms result in an additional stereo‐crystal formation with a higher melting temperature than the normal alpha‐crystal formation. In addition to accurately capturing fiber diameter profiles for the PLLA, all the important features of spinnin...
Databáze: OpenAIRE
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