Enhancement of glass transition temperature for poly(methyl methacrylate) by salt
| Autor: | Panitha Phulkerd, Antoine Courtoux, Asae Ito, Azusa Miyagawa, Viknasvarri Ayerdurai, Mizuki Soga, Masayuki Yamaguchi |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Absorption of water Polymers and Plastics oscillatory shear modulus chemistry.chemical_element 02 engineering and technology dynamic tensile modulus 010402 general chemistry 01 natural sciences chemistry.chemical_compound Materials Chemistry Tg Methyl methacrylate segmental motion chemistry.chemical_classification Lithium bromide Polymer 021001 nanoscience & nanotechnology Poly(methyl methacrylate) PMMA 0104 chemical sciences chemistry Chemical engineering visual_art visual_art.visual_art_medium Lithium 0210 nano-technology Glass transition Trifluoromethanesulfonate |
| Zdroj: | Polymer Journal. 50:857-863 |
| ISSN: | 0032-3896 |
| Popis: | We investigated the effects of two metal salts, lithium trifluoromethanesulfonate (LiCF3SO3) and lithium bromide (LiBr), on the glass transition temperature (Tg) of poly(methyl methacrylate) (PMMA). Both LiCF3SO3 and LiBr greatly enhanced the Tg of PMMA under dry conditions. However, once the sample films were exposed to humidity, the PMMA containing LiCF3SO3 absorbed a large amount of water, which acts as a plasticizer. As a result, the Tg shifted to a lower temperature, which limits the utility of this polymer in industrial applications. In contrast, the Tg of PMMA containing LiBr was minimally affected by the absorption of water. This phenomenon can be explained by the ion–dipole interactions with the small number of dissociated lithium cations. Tg of PMMA was greatly enhanced by introducing ion–dipole interaction between lithium cations and carbonyl groups in PMMA as pseudo crosslinking points. |
| Databáze: | OpenAIRE |
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