Metastable interface formation in isotactic poly(methyl methacrylate)/alumina nanoparticle mixtures
| Autor: | Yasuhiro Matsuda, Kazuki Matsuura, Shigeru Tasaka |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
010407 polymers Materials science Polymers and Plastics 02 engineering and technology Polymer 021001 nanoscience & nanotechnology 01 natural sciences Poly(methyl methacrylate) 0104 chemical sciences Amorphous solid Crystal chemistry.chemical_compound Differential scanning calorimetry chemistry Chemical engineering Tacticity visual_art Materials Chemistry visual_art.visual_art_medium Methyl methacrylate 0210 nano-technology Tetrahydrofuran |
| Zdroj: | Polymer Journal. 50:375-380 |
| ISSN: | 1349-0540 0032-3896 |
| DOI: | 10.1038/s41428-018-0022-1 |
| Popis: | The interface structures of isotactic poly(methyl methacrylate) (it-PMMA)/alumina nanoparticle (Al2O3; ~40 nm) mixtures from tetrahydrofuran (THF) solutions were investigated by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, and differential scanning calorimetry (DSC). The mixtures of it-PMMA can form two amorphous phases with different crystallinities depending on casting conditions from THF. These structures are metastable and have different activation energies for crystal nucleus formation. The polymer interface on Al2O3 particles changes into a crystallizable amorphous phase with a trans-gauche-rich chain conformation. The interphase structure of isotactic poly(methyl methacrylate) (it-PMMA)/aluminananoparticle mixtures obtained from tetrahydrofuran (THF) solution was discussed. The it-PMMA in the mixtures forms two amorphous phases (crystallizable and incrystallizable phases) depending on casting conditions from THF. The polymer interphase on Al2O3 particles changes into a crystallizable structure with a trans-gauche rich conformation and amorphous. The interphase shows a lower Tg than the melt-cast one and is easy to crystallize at low temperature. The novel structure was formed by the conformation freezing of the polymer at Al2O3 surface. |
| Databáze: | OpenAIRE |
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