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Title: Unusual large-pitch banding in poly(L-lactic acid): Effects of composition and geometry confinement

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.
Authors:
; ;  [1] ;  [2]
  1. Department of Chemical Engineering, National Cheng Kung University, Tainan, 701-01, Taiwan (China)
  2. Department of Chemical Engineering, Faculty of Industrial Technology, Sepuluh Nopember Institute of Technology Kampus ITS Sukolilo, Surabaya 60111 (Indonesia)
Publication Date:
OSTI Identifier:
22266037
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1586; Journal Issue: 1; Conference: NNS2013: 5. nanoscience and nanotechnology symposium, Surabaya (Indonesia), 23-25 Oct 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ATOMIC FORCE MICROSCOPY; LACTIC ACID; OPTICAL MICROSCOPY; POLYETHYLENE GLYCOLS; SCANNING ELECTRON MICROSCOPY