Rheological and mechanical properties of poly(methyl methacrylate) doped with lithium salts

On the basis of the lithium electrolyte mechanism, modified glassy polymers were developed by adding lithium salts to poly(methyl methacrylate) (PMMA). This review summarizes how the rheological and mechanical properties of PMMA were changed by introducing various lithium salts: lithium perchlorate (LiClO 4 ), lithium trifluoroacetate (LiCOOCF 3 ), lithium trifluoromethanesulfonate (LiCF 3 SO 3 ), lithium nonafluorobutanesulfonate (LiC 4 F 9 SO 3 ), and lithium bromide (LiBr). It was found that the rheological and mechanical properties of PMMA are dominated by the aggregation state of the salts in the matrix, the degree of bulkiness in anions, and anion size. This review focused on the "pinning" effect, which is attributed to the ion-dipole interaction between the lithium cations and PMMA molecular chains. This pinning effect was evaluated in the molten state during the molding, which directly affects the mechanical properties in the solid state. Therefore, the pinning, which depends on the anion species, affects not only the rheological and mechanical properties, but also the tensile properties of PMMA/Li-salts.

show abstract

“…where c is the polymer concentration in g/m 3 and M e is the molecular weight in Da between entanglements. As shown in 19) . Fig.…”

Section: Effects Of Compression-mold-ing Temperature On Glass Transi-...mentioning

confidence: 92%

“…Fig. 6 Schematics of PMMA doped with two lithium salts: LiCF 3 SO 3 with the shorter anion and LiC 4 F 9 SO 3 with the longer anion 19) .…”

Section: Effects Of Compression-mold-ing Temperature On Glass Transi-...mentioning

confidence: 99%

Rheological and Mechanical Properties of Poly(methyl methacrylate) Associated with Lithium Salts

Ito

Nitta

2022

J. Soc. Rheol., Jpn

Self Cite

View full text Add to dashboard Cite

show abstract

“…In a previous study, we demonstrated that the well-aggregated salts interact strongly with the polar groups of PMMA in compression-molded sheets, increasing T g [ 6 , 7 , 8 ], decreasing birefringences [ 9 ], and enhancing brittleness [ 10 ]. According to the rheological spectra at compression-molding temperature, the doping with salts was found to prolong the relaxation times in the glassy and flow regions at the compression-molding temperature.…”

Section: Introductionmentioning

confidence: 99%

“…According to the rheological spectra at compression-molding temperature, the doping with salts was found to prolong the relaxation times in the glassy and flow regions at the compression-molding temperature. These results imply that both the segmental and macro-Brownian motions of PMMA chains were suppressed in the matrix during the comp-molding process [ 10 ]. Moreover, we found that the mechanical properties of the compression-molded PMMA sheets after rapid cooling are directly influenced by the relaxation times in the flow regions at the compression-molded temperature [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

“…These results imply that both the segmental and macro-Brownian motions of PMMA chains were suppressed in the matrix during the comp-molding process [ 10 ]. Moreover, we found that the mechanical properties of the compression-molded PMMA sheets after rapid cooling are directly influenced by the relaxation times in the flow regions at the compression-molded temperature [ 10 ]. These findings resulted in the conclusion that the brittleness of the PMMA sheets is dominated by the molecular morphology in the glassy state reflecting the molecular mobility under the compression-molded process.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Viscoelastic Properties of Water-Absorbed Poly(methyl methacrylate) Doped with Lithium Salts with Various Anions

2022

View full text Add to dashboard Cite

We investigated the effects of water absorption on the dynamic mechanical properties of poly(methyl methacrylate) doped with various generic lithium salts, such as lithium perchlorate trihydrate (LiClO4), lithium trifluoromethanesulfonate (LiCF3SO3), lithium nonafluorobutanesulfonate (LiC4F9SO3), and lithium bis(trifluoromethanesulfonyl)imide (LiN(CF3SO2)). The rates of weight change during water absorption of lithium salt-doped samples were higher in the following order: LiClO4, LiCF3SO3, LiC4F9SO3, and LiN(CF3SO2). Interestingly, the aforementioned order was the same as the order of the terminal relaxation times in the flow region of the viscoelastic measurement in the melting-state. This implies that the water absorption of the salt-doped PMMA occurs due to the factors that affect the pinning of the PMMA molecular chains in the places.

show abstract

Covalently Merging Ionic Liquids and Conjugated Polymers: A Molecular Design Strategy for Green Solvent‐Processable Mixed Ion–Electron Conductors Toward High‐Performing Chemical Sensors

Lee,

Shin,

et al. 2024

Adv Funct Materials

View full text Add to dashboard Cite

Polymeric mixed ionic–electronic conductors hold great potential for advancing high‐performance organic electronics due to their exceptional electrical conductivity achieved through ion–electron coupling. However, the widespread adoption of these conductors faces obstacles due to their reliance on environmentally harmful solvents during processing and the potential performance degradation under various conditions. In this study, a practical solution to these challenges is proposed by incorporating monomers with ionic liquid‐behaving pendant groups into conjugated polymers. The copolymerization of these charged monomers not only improves solubility in environmentally friendly solvents but also imparts long‐term stability against humidity, high temperatures, and mechanical deformation. The immobilized ion species foster highly selective interactions of these polymers with nitrogen dioxide, paving the way for the development of stretchable sensing devices capable of functioning at exceptionally high temperatures.

show abstract

Rheological and mechanical properties of poly(methyl methacrylate) doped with lithium salts

Cited by 7 publications

References 15 publications

Rheological and Mechanical Properties of Poly(methyl methacrylate) Associated with Lithium Salts

Rheological and Mechanical Properties of Poly(methyl methacrylate) Associated with Lithium Salts

Viscoelastic Properties of Water-Absorbed Poly(methyl methacrylate) Doped with Lithium Salts with Various Anions

Covalently Merging Ionic Liquids and Conjugated Polymers: A Molecular Design Strategy for Green Solvent‐Processable Mixed Ion–Electron Conductors Toward High‐Performing Chemical Sensors

Contact Info

Product

Resources

About