Journal
JOURNAL OF APPLIED POLYMER SCIENCE
Volume 127, Issue 1, Pages 274-281Publisher
WILEY
DOI: 10.1002/app.37884
Keywords
melt spinning; polylactic acid; cellulose nanowhiskers; mechanical properties; thermal properties; shrinkage
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Funding
- VINNOVA (Nanofiber)
- SIDA
- National Research Foundation (NRF) [348-2008-6009]
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Bio-based continuous fibers were processed from polylactic acid (PLA) and cellulose nanowhiskers (CNWs) by melt spinning. Melt compounding of master batches of PLA with 10 wt % CNWs and pure PLA was carried out using a twin-screw extruder in which compounded pellets containing 1 and 3 wt % of CNWs were generated for subsequent melt spinning. The microscopy studies showed that the fiber diameters were in the range of 90-95 mu m, and an increased surface roughness and aggregations in the fibers containing CNWs could be detected. The addition of the CNWs restricted the drawability of the fibers to a factor of 2 and did not affect the fiber stiffness or strength, but resulted in a significantly lower strain and slightly increased crystallinity. Furthermore, CNWs increased the thermal stability, creep resistance and reduction in thermal shrinkage of PLA fibers, possibly indicating a restriction of the polymer chain mobility due to the nanoscale additives. (C) 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2012
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