Solubility and permeability of quenched poly (2,6-dimethyl phenyleneoxide) with various microvoids

Tsujita, Yoshiharu; Hachisuka, Hisao; Imai, Toshiro; Takizawa, Akira; Kinoshita, Takatoshi

doi:10.1016/s0376-7388(00)80327-0

Cited by 19 publications

(10 citation statements)

References 13 publications

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“…The occupied volume was calculated in the present study using SanchezLacombe's equation of state 29,30 based on the V-T curve observed for PPO in the liquid state from published data. 26,27 The calculated temperature dependence of the occupied PPO volume is shown in Figure 2 with its V-T curves. The characteristic temperature, T 2 , was predicted to be À75±20 1C from the intersection between the temperature dependence of the occupied and specific volumes at the hypothetical equilibrium supercooled liquid state, as shown in Figure 2.…”

Section: Resultsmentioning

confidence: 99%

“…This annealing condition was nearly identical to that in the investigations of PPO by dilatometry reported elsewhere. 26,27 The PPO-coated quartz oscillator was subsequently installed inside a home-made quartz crystal microbalance cell with a metallic seal. After drying at approximately 10 À3 mm Hg, Xe was introduced into the cell at various pressures.…”

Section: Methodsmentioning

confidence: 99%

“…Similar results were obtained at the other temperatures used in this study. The two diffusion coefficients of the carbon dioxide in PPO were determined elsewhere 26 according to the dual-mode sorption and partial immobilization 27 models. The diffusion coefficient for the Henry site, D D is larger than that for the Langmuir site, D H .…”

Section: Temperature Dependence Of Sorption Propertiesmentioning

confidence: 99%

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Temperature dependence of the mean size of polyphenyleneoxide microvoids, as studied by Xe sorption and 129Xe NMR chemical shift analyses

Yoshimizu

Ohta

Asano

et al. 2012

Polym J

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Both the Xe sorption isotherms and 129 Xe NMR spectra of poly(2,6-dimethyl-1,4-phenylene oxide), PPO, were obtained across a temperature range of -55 1C to þ 80 1C to investigate the temperature dependence of the gas sorption and the unrelaxed volume of PPO. All of the obtained sorption isotherms were analyzed based on the dual-mode sorption model, and the Langmuir saturation constant, C H 0 , which corresponds to the unrelaxed volume, was determined by curve fitting. The values of C H 0 increased linearly with decreasing temperature, and the obtained temperature was almost identical to the glass transition temperature, T g , of PPO when the C H 0 value was extrapolated to 0. The 129 Xe NMR chemical shift of 129 Xe in the PPO showed a nonlinear, low-field shift with increasing Xe pressure at temperatures below the T g . The mean volumes of individual microvoids were determined at each temperature based on the 129 Xe NMR chemical shift analysis, assuming a fast exchange of the Xe atoms between the Henry and Langmuir sorption sites. The temperature dependence of the individual microvoid volumes was similar to that of C H 0 .

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Temperature Dependence Of Sorption Propertiesmentioning

confidence: 99%

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Temperature dependence of the mean size of polyphenyleneoxide microvoids, as studied by Xe sorption and 129Xe NMR chemical shift analyses

Yoshimizu

Ohta

Asano

et al. 2012

Polym J

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“…PPE (alternately referred to as polyphenylene oxide, PPO) is an engineering thermoplastic with excellent mechanical properties and thermal stability that is widely employed for gas separation membranes. [3][4][5][6] In order to overcome the inherent limitations in its processability, [7] PPE is widely employed in the form of miscible or immiscible blends with a variety of other polymers. [7][8][9][10] When developing barrier or selective permeability solutions with PPE, it then becomes critical to screen the permeability properties of a multitude of formulations with PPE so as to balance permeability with processability.…”

Section: Objectivementioning

confidence: 99%

A Multiscale Approach for Estimating Permeability Properties of Polymers with Complex Aromatic Backbones: A Case Study on Diffusivity of Small Gas Molecules in Polyphenylene Ether

Sweere

Patham²,

Sugur³

et al. 2020

Macro Theory & Simulations

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State‐of‐the‐art multiscale computational chemistry simulations is employed to predict diffusivity of small gaseous molecules in a generic polyphenylene ether (PPE). The diffusivities are obtained from trajectory analysis of gaseous molecules in molecular dynamics simulations using coarse‐grained dissipative particle dynamics (DPD) simulations to design the amorphous starting structure. Required intra‐ and intermolecular parameters of the DPD simulations are automatically generated using the automated fragmentation and parametrization protocol. A comparison of calculated diffusion coefficients with experimental data for five gaseous molecules in PPE shows adequate accuracy of computational‐chemistry‐based approaches in the prediction of diffusion coefficients. These estimates, validated against measurements reported in the literature, serve as proof of concept for applicability of these new multiscale modeling strategies for complex polymers with aromatic backbones.

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“…Physical modifications such as thermal quenching and pressure conditioning from the liquid state were tried for glassy polymers (15)(16)(17). Such processes effectively alter the physical rather than the chemical structure of the polymer.…”

mentioning

confidence: 99%

Effect of Microwave Irradiation on CO₂ Permeability in Cellulose Acetate Membranes

Tsujita

Nakai

Yoshimizu

et al. 2004

ACS Symposium Series

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Solubility and permeability of quenched poly (2,6-dimethyl phenyleneoxide) with various microvoids

Cited by 19 publications

References 13 publications

Temperature dependence of the mean size of polyphenyleneoxide microvoids, as studied by Xe sorption and 129Xe NMR chemical shift analyses

Temperature dependence of the mean size of polyphenyleneoxide microvoids, as studied by Xe sorption and 129Xe NMR chemical shift analyses

A Multiscale Approach for Estimating Permeability Properties of Polymers with Complex Aromatic Backbones: A Case Study on Diffusivity of Small Gas Molecules in Polyphenylene Ether

Effect of Microwave Irradiation on CO₂ Permeability in Cellulose Acetate Membranes

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Solubility and permeability of quenched poly (2,6-dimethyl phenyleneoxide) with various microvoids

Cited by 19 publications

References 13 publications

Temperature dependence of the mean size of polyphenyleneoxide microvoids, as studied by Xe sorption and 129Xe NMR chemical shift analyses

Temperature dependence of the mean size of polyphenyleneoxide microvoids, as studied by Xe sorption and 129Xe NMR chemical shift analyses

A Multiscale Approach for Estimating Permeability Properties of Polymers with Complex Aromatic Backbones: A Case Study on Diffusivity of Small Gas Molecules in Polyphenylene Ether

Effect of Microwave Irradiation on CO2 Permeability in Cellulose Acetate Membranes

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Effect of Microwave Irradiation on CO₂ Permeability in Cellulose Acetate Membranes