Thermal stability of porous it‐PMMA thin film obtained by the extraction of st‐PMAA from it‐PMMA/st‐PMAA stereocomplex with layer‐by‐layer assembly on a substrate |
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| Authors: | Hiroharu Ajiro Masumi Maegawa Mitsuru Akashi |
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| Affiliation: | 1. The Center for Advanced Medical Engineering and Informatics, Osaka University, 2‐2, Yamada‐oka, Suita, Osaka 565‐0871, Japan;2. Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2‐1 Yamada‐oka, Suita, Osaka 565‐0871, Japan |
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| Abstract: | The functionality of porous isotactic (it) poly(methyl methacrylate) (PMMA) thin films, which were previously developed by the selective extraction of syndiotactic (st) poly(methacrylic acid) (PMAA) from the it‐PMMA/st‐PMAA stereocomplex thin film on a substrate using the layer‐by‐layer assembly method was investigated after thermal treatment (70, 80, and 90 °C) in water for 4 h. Quartz crystal microbalance analysis and infrared spectra measurements revealed that the st‐PMAA incorporation ability of the porous it‐PMMA thin film decreased in order at 80 and 90 °C, while there was no decrease observed at 70 °C. X‐ray diffraction analysis also supported the thermal stability of the porosity at 70 °C, whereas two it‐PMMA crystalline peaks (2θ = 9° and 14°) were generated during heating at 90 °C. The loss of the functionality of the it‐PMMA thin film was thus shown to be due to crystallization, which was caused by the increase in polymer‐chain mobility during the heating process. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 3265–3270, 2010 |
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| Keywords: | nanolayers poly(methyl methacrylate) stereocomplex templates thermal properties |
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