Impacts of ions on the plasticization of cellulose triacetate by fluorinated ionic liquids: Thermal properties, microscopy, Raman spectra, and sorption of pure enantiomers

Hovorka, Štěpán; Hrdlička, Zdeněk; Jeništová, Adéla; Švecová, Marie; Izák, Pavel; Čížek, Jan; Michalcová, Alena; Hadravová, Romana; Vopička, Ondřej

doi:10.1016/j.polymer.2023.126502

Cited by 3 publications

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“…Mechanical properties and other bulk characteristics of glassy polymers, such as volume, permeability, diffusivity, sorption, vibrational spectra, phase transitions, swelling, and so forth, 3,4,[6][7][8]11,12,[14][15][16]18,23,27,[34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52] are influenced by the presence of the low-molecular-weight compounds and sample history. To study the simultaneous effects of the volatile compounds and aging, longterm tests under constant conditions are possible but experimentally demanding.…”

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confidence: 99%

Stiffening and softening of freshly prepared and aged CTA, PTMSP, and PIM‐1 films exposed to volatile compounds

Durd'áková,

Hrdlička,

Král

et al. 2024

Journal of Polymer Science

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Glassy polymers stiffen or soften when exposed to volatile compounds, depending on the specific combination of polymer compound and the specimen history. Relevant to the long‐term applicability of the separation membranes, three common membrane glassy polymers are studied in this work. Freshly prepared and 2‐years aged films from cellulose triacetate (CTA), poly[1‐(trimethylsilyl)‐1‐propyne] (PTMSP), and the archetypal polymer of intrinsic microporosity (PIM‐1) were tested using isothermal Dynamic Mechanical Analysis (DMA) at varied vapor activity. Vapors of organic compounds, in which the polymers do and do not dissolve in the liquid phase (solvents and nonsolvents), were studied at 40 °C, namely: dichloromethane (DCM, solvent), p‐xylene (solvent for PTMSP and PIM‐1), and methanol (nonsolvent). Functional groups of the mer units sensitive to the dissolution were identified using Raman spectroscopy. All aged films were stiffer than the freshly prepared ones. Stiffening prevailed for most freshly prepared film‐vapor pairs at low vapor saturations (activity < ≈0.4), except CTA and PIM‐1 in nonsolvent methanol vapors. Softening prevailed for the aged films and higher vapor saturations (activity > ≈0.6). Vapors of the solvents and nonsolvents did not show the expectable prevalence of softening and stiffening, respectively. Physical aging influenced the stiffening and softening of polymer glasses expectably.

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