Effect of Amorphous Region on Magnetic Orientation of Poly(lactic acid) Blend Films with Different Molecular Weight

R. Nakayama; H. Ikake; K. Kurita; S. Shimizu; S. Kurumi; K. Suzuki; K. Takahashi; H. Nojiri

doi:10.3379/msjmag.1703R001

Biomagnetism / Medical Applications

Effect of Amorphous Region on Magnetic Orientation of Poly(lactic acid) Blend Films with Different Molecular Weight

R. Nakayama, H. Ikake, K. Kurita, S. Shimizu, S. Kurumi, K. Suzuki, K. Takahashi, H. Nojiri

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Keywords: magnetic-induced-orientation film, poly(L-lactide), poly(DL-lactide), amorphous, blend film, high magnetic field

JOURNAL OPEN ACCESS

2017 Volume 41 Issue 3 Pages 66-69

DOI https://doi.org/10.3379/msjmag.1703R001

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Abstract

The magnetic-field-induced blend films, poly(L-lactide)(PLLA10) (M_n = 1.0 × 10⁵) and poly(DL-lactide) (M_w = 1.0 × 10⁴ (PDLLA1) and 1.0 × 10⁵ (PDLLA10)) were prepared in isothermal process under the magnetic-field 10 T. The effects of amorphous region, i.e., molecular weight of PDLLA effect on crystallization and orientation of PLLA in the films were investigated using wide-angle X-ray diffraction and polarizing microscopy. The crystallinity of each films showed 60% at crystallization growth time t_c = 30 hrs irrespective of PDLLA molecular weight. The degree of orientation of PLLA10/PDLLA10 film increased with increasing t_c. We concluded that the blending with amorphous high-molecular-weigh PDLLA and crystallization in an applied high magnetic field is effective to achieve the PLLA film that has higher crystallinity and orientation.

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