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Effects of Stereocomplex Nuclei or Spherulites on Crystalline Morphology and Crack Behavior of Poly(L-lactic acid)

✍ Scribed by Siti Nurkhamidah; Eamor M. Woo

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
1013 KB
Volume
212
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Introduction of sc‐PLA crystals as small nuclei or large sc‐PLA spherulites has great influence on patterning the inter‐phase boundaries and reducing the cracks in crystallized PLLA in mixtures with PDLA. Unmelted sc‐PLA crystals as nuclei induce cracks in later‐crystallized PLLA, whereas co‐crystallization of PLLA with PDLA to develop simultaneous PLLA and sc‐PLA spherulites is effective in altering the inter‐phases for minimizing the cracks. PLLA co‐crystallized with sc‐PLA spherulites tends to be more compact than PLLA spherulites crystallizing on sc‐PLA nuclei. In general, the sc‐PLA spherulites suppress the occurrence of a stressed interphase in PLLA spherulites and the depth of cooling‐induced cracks is also decreased. magnified image

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