TY - GEN
T1 - Unusual large-pitch banding in poly(L-lactic acid)
T2 - 5th Nanoscience and Nanotechnology Symposium, NNS 2013
AU - Woo, Eamor M.
AU - Lugito, Graecia
AU - Hsieh, Ya Ting
AU - Nurkhamidah, Siti
PY - 2014
Y1 - 2014
N2 - Lamellar patterns and orientations in blends of two crystalline polymers: poly(ethylene oxide) (PEO) and low-molecular-weight poly(L-lactic acid) (PLLA) were investigated using polarizing light optical microscopy (POM), and atomic and scanning electron microscopy (AFM, SEM). Specific etching off of PEO was used to reveal the complex earlier-grown PLLA lamellae patterns with various PEO content in blends. Banding of extremely long pitch (50 μm) in crystallized PLLA spherulites was induced by two kinetic factors: geometry confinement by top cover and introduction of diluent such as PEO. The mechanisms and correlation among the lamellar assembly, ring bands, and cracks are exemplified. Lamellar patterns and ring-band types in blends were found to vary with respect to not only blend compositions, but also confinement of top-cover.
AB - Lamellar patterns and orientations in blends of two crystalline polymers: poly(ethylene oxide) (PEO) and low-molecular-weight poly(L-lactic acid) (PLLA) were investigated using polarizing light optical microscopy (POM), and atomic and scanning electron microscopy (AFM, SEM). Specific etching off of PEO was used to reveal the complex earlier-grown PLLA lamellae patterns with various PEO content in blends. Banding of extremely long pitch (50 μm) in crystallized PLLA spherulites was induced by two kinetic factors: geometry confinement by top cover and introduction of diluent such as PEO. The mechanisms and correlation among the lamellar assembly, ring bands, and cracks are exemplified. Lamellar patterns and ring-band types in blends were found to vary with respect to not only blend compositions, but also confinement of top-cover.
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U2 - 10.1063/1.4866721
DO - 10.1063/1.4866721
M3 - Conference contribution
AN - SCOPUS:84906501916
SN - 9780735412187
T3 - AIP Conference Proceedings
SP - 7
EP - 13
BT - 5th Nanoscience and Nanotechnology Symposium, NNS 2013
PB - American Institute of Physics Inc.
Y2 - 23 October 2013 through 25 October 2013
ER -