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Complicated Structure Change during Capillary Extrusion of Binary Blends of Polycarbonate and Poly(methyl methacrylate)

The effects of pressure and shear rate on the miscibility of binary blends comprising bisphenol-A polycarbonate (PC) and low molecular weight poly(methyl methacrylate) (PMMA) were investigated using a capillary rheometer. Both pressure and shear rate affected the miscibility. The examination of an e...

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Autores principales: Yamaguchi, Masayuki, Nakamura, Kodai, Kimura, Takeyoshi, Moonprasith, Nantina, Kida, Takumitsu, Tsubouchi, Kyoko, Narita, Takaaki, Hiraoka, Tatsuhiro
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9026293/
https://www.ncbi.nlm.nih.gov/pubmed/35454475
http://dx.doi.org/10.3390/ma15082783
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author Yamaguchi, Masayuki
Nakamura, Kodai
Kimura, Takeyoshi
Moonprasith, Nantina
Kida, Takumitsu
Tsubouchi, Kyoko
Narita, Takaaki
Hiraoka, Tatsuhiro
author_facet Yamaguchi, Masayuki
Nakamura, Kodai
Kimura, Takeyoshi
Moonprasith, Nantina
Kida, Takumitsu
Tsubouchi, Kyoko
Narita, Takaaki
Hiraoka, Tatsuhiro
author_sort Yamaguchi, Masayuki
collection PubMed
description The effects of pressure and shear rate on the miscibility of binary blends comprising bisphenol-A polycarbonate (PC) and low molecular weight poly(methyl methacrylate) (PMMA) were investigated using a capillary rheometer. Both pressure and shear rate affected the miscibility. The examination of an extruded strand of the blend provided information about the cause of the phase change. Under high pressure, pressure-induced demixing occurred at temperatures below the lower critical solution temperature (LCST) of the blend. Consequently, the extruded strand became opaque throughout. During shear-induced mixing/demixing, a part of the strand became opaque because of the distribution of the shear rate in the strand. For example, during shear-induced demixing, only the exterior of the strand, i.e., the high shear rate region, became opaque. Above the LCST, shear-induced mixing occurred, and only the center region of the strand became opaque.
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spelling pubmed-90262932022-04-23 Complicated Structure Change during Capillary Extrusion of Binary Blends of Polycarbonate and Poly(methyl methacrylate) Yamaguchi, Masayuki Nakamura, Kodai Kimura, Takeyoshi Moonprasith, Nantina Kida, Takumitsu Tsubouchi, Kyoko Narita, Takaaki Hiraoka, Tatsuhiro Materials (Basel) Article The effects of pressure and shear rate on the miscibility of binary blends comprising bisphenol-A polycarbonate (PC) and low molecular weight poly(methyl methacrylate) (PMMA) were investigated using a capillary rheometer. Both pressure and shear rate affected the miscibility. The examination of an extruded strand of the blend provided information about the cause of the phase change. Under high pressure, pressure-induced demixing occurred at temperatures below the lower critical solution temperature (LCST) of the blend. Consequently, the extruded strand became opaque throughout. During shear-induced mixing/demixing, a part of the strand became opaque because of the distribution of the shear rate in the strand. For example, during shear-induced demixing, only the exterior of the strand, i.e., the high shear rate region, became opaque. Above the LCST, shear-induced mixing occurred, and only the center region of the strand became opaque. MDPI 2022-04-10 /pmc/articles/PMC9026293/ /pubmed/35454475 http://dx.doi.org/10.3390/ma15082783 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/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 (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Yamaguchi, Masayuki
Nakamura, Kodai
Kimura, Takeyoshi
Moonprasith, Nantina
Kida, Takumitsu
Tsubouchi, Kyoko
Narita, Takaaki
Hiraoka, Tatsuhiro
Complicated Structure Change during Capillary Extrusion of Binary Blends of Polycarbonate and Poly(methyl methacrylate)
title Complicated Structure Change during Capillary Extrusion of Binary Blends of Polycarbonate and Poly(methyl methacrylate)
title_full Complicated Structure Change during Capillary Extrusion of Binary Blends of Polycarbonate and Poly(methyl methacrylate)
title_fullStr Complicated Structure Change during Capillary Extrusion of Binary Blends of Polycarbonate and Poly(methyl methacrylate)
title_full_unstemmed Complicated Structure Change during Capillary Extrusion of Binary Blends of Polycarbonate and Poly(methyl methacrylate)
title_short Complicated Structure Change during Capillary Extrusion of Binary Blends of Polycarbonate and Poly(methyl methacrylate)
title_sort complicated structure change during capillary extrusion of binary blends of polycarbonate and poly(methyl methacrylate)
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9026293/
https://www.ncbi.nlm.nih.gov/pubmed/35454475
http://dx.doi.org/10.3390/ma15082783
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