Nanoporosity of polymer membranes and corresponding powder materials on the bases of gas sorption results and positron annihilation experiments

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Variations of nanoporosity obtained on casting of membranes from the original highly dispersed polyphenylene oxides (PPO) of various crystallinity (from 0 to 69.2%) on the bases of the data, obtained by the methods of positron annihilation and low temperature gas (N2, CO₂) sorption, are discussed. The notion of nanoporosity includes microporosity and mesoporosity of the materials with pore sizes from some Å up to several tens of nanometers. A combination of the results of positron annihilation and sorption measurements with oxygen permeation data for the created membranes allow to conclude that, on transition from powder to solid membrane, microporosity is mostly stays unhanged while mesoporosity essentially transforms.

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V. Shantarovich

Smenov Federal Research Center for Chemical Physics, Russian Academy of Sciences

编辑信件的主要联系方式.
Email: shant@chph.ras.ru
俄罗斯联邦, Moscow

V. Bekeshev

Smenov Federal Research Center for Chemical Physics, Russian Academy of Sciences

Email: shant@chph.ras.ru
俄罗斯联邦, Moscow

I. Kevdina

Smenov Federal Research Center for Chemical Physics, Russian Academy of Sciences

Email: shant@chph.ras.ru
俄罗斯联邦, Moscow

A. Alentiev

Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences

Email: shant@chph.ras.ru
俄罗斯联邦, Moscow

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2. Fig. 1. Isotherms of CO₂ adsorption by polyphenylene oxide PPO membranes.

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3. Fig. 2. CO₂ adsorption isotherms for PPO powders used in casting the corresponding membranes.

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4. Fig. 3. Isotherms of N₂ adsorption (dark symbols) and desorption (light symbols) at 77 K in the initial PPO powders.

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5. Fig. 4. Pore size distribution for the PPO-4 sample (PPO-500, powder), calculated from the sorption curve using the DFT model for nitrogen adsorbate N₂ at 77 K. The peaks correspond to pore diameters of 1.5, 3.0, and 7.8 nm.

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