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Anomalous Postprocessing Dimensional Change of Injection-Molded Products Composed of Poly(lactic acid) and Poly(vinyl alcohol) AITranslate

Masayuki Yamaguchi; Wen Shu; Takeyoshi Kimura; HoangGiang Dai Vo; Takumitsu Kida; Toyoichiro Mori; Makoto Kitani; Norifumi Aridome; Akira Miyamoto
Japan Advanced Institute of Science and Technology; Japan Advanced Institute of Science and Technology; Japan Advanced Institute of Science and Technology; Japan Advanced Institute of Science and Technology; Japan Advanced Institute of Science and Technology;Nagase Plastics Corporation, 1-1-17 Shinmachi;Nagase Plastics Corporation, 1-1-17 Shinmachi;Nagase Plastics Corporation, 1-1-17 Shinmachi;Nagase Plastics Corporation, 1-1-17 Shinmachi
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Publisher: ACS
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Abstract AITranslate

The present study revealed that an injection-molded product comprising poly(lactic acid) (PLA) and poly(vinyl alcohol) (PVAL) exhibited an anomalous dimensional change, i.e., expansion in the flow direction, after postprocessing annealing (around 2.9% expansion by annealing at 80–100 °C for 3 h). Although the crystallization of the PLA during cooling was not accelerated by the addition of PVAL, the PLA showed transcrystallization from the dispersed PVAL droplets, which were deformed in the flow direction, during postprocessing annealing. Therefore, after annealing, the injection-molded products exhibited a high degree of molecular orientation, in contrast to the original unannealed products, which were not oriented. This anomalous behavior should be noted as a means of controlling dimensional change after processing.

KeyWords AITranslate

poly(lactic acid) injection molding dimensional change crystallization annealing
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DOI：https://doi.org/10.1021/acsapm.2c02155

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Citation Information:

The present study revealed that an injection-molded product comprising poly(lactic acid) (PLA) and poly(vinyl alcohol) (PVAL) exhibited an anomalous dimensional change, i.e., expansion in the flow direction, after postprocessing annealing (around 2.9% expansion by annealing at 80–100 °C for 3 h). Although the crystallization of the PLA during cooling was not accelerated by the addition of PVAL, the PLA showed transcrystallization from the dispersed PVAL droplets, which were deformed in the flow direction, during postprocessing annealing. Therefore, after annealing, the injection-molded products exhibited a high degree of molecular orientation, in contrast to the original unannealed products, which were not oriented. This anomalous behavior should be noted as a means of controlling dimensional change after processing.

quote

GB/T 7714-2015 [1] Masayuki Yamaguchi, Wen Shu, Takeyoshi Kimura, et al. ACS Applied Polymer Materials, 2023(5). DOI:10.1021/acsapm.2c02155.
MLA [1] Masayuki Yamaguchi, et al., ACS Applied Polymer Materials, no. 5, 2023, https://doi.org/10.1021/acsapm.2c02155.
APA [1] Masayuki Yamaguchi, Wen Shu, Takeyoshi Kimura, HoangGiang Dai Vo, Takumitsu Kida, Toyoichiro Mori, Makoto Kitani, Norifumi Aridome, & Akira Miyamoto. (2023). ACS Applied Polymer Materials(5). https://doi.org/10.1021/acsapm.2c02155
IEEE [1] Masayuki Yamaguchi, Wen Shu, Takeyoshi Kimura, HoangGiang Dai Vo, Takumitsu Kida, Toyoichiro Mori, Makoto Kitani, Norifumi Aridome, and Akira Miyamoto, ACS Applied Polymer Materials, no. 5, 2023, doi: 10.1021/acsapm.2c02155. keywords: {poly(lactic acid);injection molding;dimensional change;crystallization;annealing}