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Polymers 2018, 10(2), 148; https://doi.org/10.3390/polym10020148

Evolution of Filament-Shaped Porous Structure in Polycarbonate by Stretching under Carbon Dioxide

Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology, Koganei-shi, Tokyo 184-8588, Japan
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Received: 19 December 2017 / Revised: 25 January 2018 / Accepted: 30 January 2018 / Published: 5 February 2018
(This article belongs to the Special Issue Green Plasticizers for Polymers)
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Abstract

We found that a filament-shaped porous structure with periodic distance was obtained in polycarbonate for optical disk grade (OD-PC) film by stretching under compressed carbon dioxide (CO2). The evolution of the characteristic porous structure was investigated by in situ observation during the stretching under compressed CO2 and the optical microscopic observation of the stretched specimen. The voids were obtained under high CO2 pressure as in the case of elevated temperature, suggesting that the evolution of the voids was caused by crazing due to chain disentanglement by accelerated molecular motion owing to the plasticization effect of CO2. The filament-shaped voids were initiated at around the yielding point and increased continuously by nucleation in the matrix around the surface of the pre-existing voids. The shape of the voids did not change to an ellipsoidal one during stretching due to suppression of the craze opening by the hydrostatic pressure effect. The stretching of the CO2-absorbed depressurized OD-PC revealed that the initiation of the voids was not only caused by the plasticization effect, but the hydrostatic pressure effect was also required. View Full-Text
Keywords: polycarbonate; porous structure; carbon dioxide; void; stretching; plasticization; hydrostatic pressure polycarbonate; porous structure; carbon dioxide; void; stretching; plasticization; hydrostatic pressure
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Taguchi, T.; Hatakeyama, T.; Miike, R.; Saito, H. Evolution of Filament-Shaped Porous Structure in Polycarbonate by Stretching under Carbon Dioxide. Polymers 2018, 10, 148.

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