Local lamellar structures in banded spherulites analyzed by three‐dimensional electron tomography |
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| Authors: | Takayuki Ikehara Hiroshi Jinnai Takeshi Kaneko Hideo Nishioka Toshio Nishi |
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| Affiliation: | 1. Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University, 3‐27‐1, Rokkakubashi, Kanagawa‐Ku, Yokohama 221‐8686, JapanDepartment of Material and Life Chemistry, Faculty of Engineering, Kanagawa University, 3‐27‐1, Rokkakubashi, Kanagawa‐Ku, Yokohama 221‐8686, Japan;2. Department of Macromolecular Science and Engineering, Graduate School of Science and Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo‐Ku, Kyoto 606‐8585, Japan;3. Joint Research Center for the Project on Nanostructure Polymeric Materials, Japan Chemical Innovation Institute, Kyoto Institute of Technology, Matsugasaki, Sakyo‐Ku, Kyoto 606‐8585, Japan;4. Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, O‐Okayama, Meguro‐Ku, Tokyo 152‐8552, Japan |
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| Abstract: | The lamellar morphology in banded spherulites of poly(ε‐caprolactone) blended with an amorphous polymer, poly(vinyl butyral), was investigated by three‐dimensional transmission electron tomography. It showed a local lamellar twist on a smaller scale than the band spacing by 2 orders of magnitude. It also indicated wavy lamellae and frequent variation in the direction of the lamellar plane. All these results indicated an S‐profiled lamellar structure; that is, the cross section perpendicular to the lamellar growth direction was S‐shaped. S‐profiled lamellae show these structures when they are sliced at a certain angle to the lamellar surface direction. Lamellar branching was also observed, but no screw dislocations that led to the formation of extinction rings were observed in this work. © 2007 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 45: 1122–1125, 2007 |
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| Keywords: | blends crystal structures electron microscopy lamellar morphology polyesters TEM |
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