Mixed-matrix membranes based on 6FDA-ODA polyimide and silicalite-1 with homogeneous spatial distribution of particles

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F19%3A43918642" target="_blank" >RIV/60461373:22310/19:43918642 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0032386119305609?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0032386119305609?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.polymer.2019.121576" target="_blank" >10.1016/j.polymer.2019.121576</a>

Result language

angličtina

Original language name

Mixed-matrix membranes based on 6FDA-ODA polyimide and silicalite-1 with homogeneous spatial distribution of particles

Original language description

We report an experimental procedure leading to defect-free mixed-matrix membranes with a homogeneous spatial distribution of filler particles, volume fractions of which are within the interval [0.10, 0.35]. A polyimide matrix was synthesized from 4,4&apos;-(hexafluoroisopropylidene) diphtalic anhydride and 4,4&apos;-oxydianiline in the solution with N,N-dimethylformamide. (3-aminopropyl) triethoxysilane was used as a linker to improve the phase contact between silicalite-1 particles and the polyimide matrix. We found that a homogeneous spatial distribution of particles in the resulting membrane was achieved if kinematic viscosity of a polyimide precursor solution was greater than 9.5 cm(2) s(-1). To do so, an initial mass fraction of the solids in the solution, a reaction temperature and a concentration of water in the solvent had to carefully be selected and controlled. Besides these conditions, we fine-tuned the process of imidization, particularly the rate of evaporation of N,N-dimethylformamide. We arrived at the conclusion that its effect on reproducibility of the entire process was minor rather than major. In addition, we characterised microstructures of the resulting membranes by imaging in a scanning electron microscope. In this context we examined two ways of preparation of membrane specimens and showed that back-scattered electron imaging of polished sections obtained using a metallographic technique clearly outperformed the often-used imaging of fractured surfaces. Finally, we evaluated the homogeneity of spatial distributions of particles by means of morphological descriptors, namely a position-dependent volume fraction of the silicalite-1 phase.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)

Project

<a href="/en/project/LO1613" target="_blank" >LO1613: Future materials</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Polymer

ISSN

0032-3861

e-ISSN

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Volume of the periodical

178

Issue of the periodical within the volume

12 September 2019

Country of publishing house

US - UNITED STATES

Number of pages

12

Pages from-to

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UT code for WoS article

000483922700039

EID of the result in the Scopus database

2-s2.0-85067893517