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Title: Crystal Orientation of Poly(l-Lactic Acid) Induced by Magnetic Alignment of a Nucleating Agent
Authors: Kusumi, Ryosuke  kyouindb  KAKEN_id
Teranishi, Sachi
Kimura, Fumiko
Wada, Masahisa  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-3508-3307 (unconfirmed)
Kimura, Tsunehisa
Horikawa, Yoshiki
Kawai, Takahiko
Author's alias: 久住, 亮介
木村, 史子
Keywords: poly(l-lactic acid)
nucleating agent
magnetic orientation
epitaxial growth
Issue Date: Jun-2018
Publisher: MDPI AG
Journal title: Polymers
Volume: 10
Issue: 6
Thesis number: 653
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.
Rights: © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
URI: http://hdl.handle.net/2433/232991
DOI(Published Version): 10.3390/polym10060653
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