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Polymers 2018, 10(6), 653; https://doi.org/10.3390/polym10060653

Crystal Orientation of Poly(l-Lactic Acid) Induced by Magnetic Alignment of a Nucleating Agent

1
Division of Forest and Biomaterials Science, Kyoto University, Kyoto 606-8502, Japan
2
Department of Plant and Environmental New Resources, College of Life Sciences, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do 446-701, Korea
3
Institute of Agriculture, Tokyo University of Agriculture and Technology, Fuchu 183-8509, Japan
4
Graduate School of Science and Technology, Gunma University, Ota 376-0053, Japan
*
Author to whom correspondence should be addressed.
Received: 1 May 2018 / Revised: 7 June 2018 / Accepted: 8 June 2018 / Published: 11 June 2018
(This article belongs to the Special Issue Magnetic Field in Polymer Research)
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Abstract

The orientation of poly(l-lactic acid) (PLLA) crystals was controlled through crystal growth from a magnetically oriented nucleating agent, phenylphosphonic acid zinc (PPAZn). The one-dimensional magnetically oriented microcrystal array of PPAZn microcrystals revealed the relationship between the magnetization and crystallographic axes in the PPAZn crystal. The PPAZn microcrystals were homogeneously dispersed in PLLA via melt mixing, which decreased the molecular weight of the PLLA component due to degradation. The PPAZn microcrystals in the molten PLLA were uniaxially aligned under an 8-T static or rotating magnetic field. The wide-angle X-ray diffraction and small-angle X-ray scattering patterns of the PPAZn/PLLA composite films crystallized under each magnetic field showed that the PLLA lamellae grew from the surface of the PPAZn microcrystals, which were uniaxially oriented along the easy- or hard-magnetization axis, with the c-axis of PLLA parallel to the bc-plane of PPAZn. It was also suggested that the greater nucleating effect of PPAZn on PLLA was derived not from geometrical matching, but from factors such as favorable interactions and/or the plate-like shape of the microcrystal. View Full-Text
Keywords: poly(l-lactic acid); nucleating agent; magnetic orientation; epitaxial growth poly(l-lactic acid); nucleating agent; magnetic orientation; epitaxial growth
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Kusumi, R.; Teranishi, S.; Kimura, F.; Wada, M.; Kimura, T.; Horikawa, Y.; Kawai, T. Crystal Orientation of Poly(l-Lactic Acid) Induced by Magnetic Alignment of a Nucleating Agent. Polymers 2018, 10, 653.

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