Effects of Stereocomplex Nuclei or Spherulites on Crystalline Morphology and Crack Behavior of Poly(L

摘要

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.