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Effect of the Thermal History on the Crystallinity of Poly (L-lactic Acid) During the Micromolding Process
The micromolding process using biocompatible thermoplastic polymers is highly attractive as a fabrication process of microdevices in biomedical applications. In this study, we investigated the effect of the thermal history in the micromolding process on the crystallinity of semi-crystalline polymers...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7281556/ https://www.ncbi.nlm.nih.gov/pubmed/32344884 http://dx.doi.org/10.3390/mi11050452 |
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author | Takehara, Hiroaki Hadano, Yuki Kanda, Yukihiro Ichiki, Takanori |
author_facet | Takehara, Hiroaki Hadano, Yuki Kanda, Yukihiro Ichiki, Takanori |
author_sort | Takehara, Hiroaki |
collection | PubMed |
description | The micromolding process using biocompatible thermoplastic polymers is highly attractive as a fabrication process of microdevices in biomedical applications. In this study, we investigated the effect of the thermal history in the micromolding process on the crystallinity of semi-crystalline polymers, such as poly (L-lactic acid) (PLLA), during their crystallization from the amorphous and molten states. In particular, the thermal history in the micromolding process using poly(dimethylsiloxane) replica mold embedded with a thermocouple was recorded. The crystallinity of PLLA constructs fabricated using the micromolding process was measured via wide-angle X-ray scattering, and crystallization kinetics was analyzed based on the Kolmogorov–Johnson–Mehl–Avrami equation. A crystallization rate of k = 0.061 min(−n) was obtained in the micromolding process of PLLA crystallization from the amorphous state, accompanied by the quenching operation, forming a large number of crystal nuclei. Finally, the fabrication of PLLA microneedles was performed using micromolding processes with different thermal histories. The information about the thermal history during the micromolding process is significant in the development of polymer microdevices to achieve better material properties. |
format | Online Article Text |
id | pubmed-7281556 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-72815562020-06-17 Effect of the Thermal History on the Crystallinity of Poly (L-lactic Acid) During the Micromolding Process Takehara, Hiroaki Hadano, Yuki Kanda, Yukihiro Ichiki, Takanori Micromachines (Basel) Article The micromolding process using biocompatible thermoplastic polymers is highly attractive as a fabrication process of microdevices in biomedical applications. In this study, we investigated the effect of the thermal history in the micromolding process on the crystallinity of semi-crystalline polymers, such as poly (L-lactic acid) (PLLA), during their crystallization from the amorphous and molten states. In particular, the thermal history in the micromolding process using poly(dimethylsiloxane) replica mold embedded with a thermocouple was recorded. The crystallinity of PLLA constructs fabricated using the micromolding process was measured via wide-angle X-ray scattering, and crystallization kinetics was analyzed based on the Kolmogorov–Johnson–Mehl–Avrami equation. A crystallization rate of k = 0.061 min(−n) was obtained in the micromolding process of PLLA crystallization from the amorphous state, accompanied by the quenching operation, forming a large number of crystal nuclei. Finally, the fabrication of PLLA microneedles was performed using micromolding processes with different thermal histories. The information about the thermal history during the micromolding process is significant in the development of polymer microdevices to achieve better material properties. MDPI 2020-04-25 /pmc/articles/PMC7281556/ /pubmed/32344884 http://dx.doi.org/10.3390/mi11050452 Text en © 2020 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/). |
spellingShingle | Article Takehara, Hiroaki Hadano, Yuki Kanda, Yukihiro Ichiki, Takanori Effect of the Thermal History on the Crystallinity of Poly (L-lactic Acid) During the Micromolding Process |
title | Effect of the Thermal History on the Crystallinity of Poly (L-lactic Acid) During the Micromolding Process |
title_full | Effect of the Thermal History on the Crystallinity of Poly (L-lactic Acid) During the Micromolding Process |
title_fullStr | Effect of the Thermal History on the Crystallinity of Poly (L-lactic Acid) During the Micromolding Process |
title_full_unstemmed | Effect of the Thermal History on the Crystallinity of Poly (L-lactic Acid) During the Micromolding Process |
title_short | Effect of the Thermal History on the Crystallinity of Poly (L-lactic Acid) During the Micromolding Process |
title_sort | effect of the thermal history on the crystallinity of poly (l-lactic acid) during the micromolding process |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7281556/ https://www.ncbi.nlm.nih.gov/pubmed/32344884 http://dx.doi.org/10.3390/mi11050452 |
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