Nematic liquid crystalline polymer films for gas separation

Joey Kloos; Johan Lub; Menno Houben; Zandrie Borneman; Kitty Nijmeijer; Albert P.H.J. Schenning

doi:10.1080/02678292.2022.2134597

Nematic liquid crystalline polymer films for gas separation

Joey Kloos, Johan Lub, Menno Houben, Zandrie Borneman, Kitty Nijmeijer, Albert P.H.J. Schenning (Corresponding author)

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Abstract

The gas separation performances of free-standing planar aligned nematic LC polymer films were investigated for gas separations of He, CO₂, CH₄ and Xe. The films consist of derivatives of 1,4-phenylene bis(4-((6-(acryloyloxy)hexyl)oxy)benzoate)s with respective cyano, chloro, methyl and phenyl substituents on the central aromatic cores. Two new LC derivatives of 1,4-phenylene bis(4-((6-(acryloyloxy)hexyl)oxy)benzoate)s were successfully synthesised and fully characterised. Single gas permeation and sorption data show increasing gas permeabilities with increasing steric size of the substituents while the ideal gas selectivity of He over CH₄ and He over CO₂ decreases. The sorption coefficient of all films is independent of the LC substituents, while the subsequently extracted diffusion coefficient for the films with a phenyl substituent is three times higher compared to the films with a cyano substituent, demonstrating that the steric size of the LC substituents mainly affects the diffusion of gasses rather than the solubility of the gases. Irrespective of a methyl or a phenyl substituent, a larger kinetic diameter of Xe gives a 20 times lower diffusion coefficient compared to the smaller species (CO₂).

Original language	English
Pages (from-to)	414-422
Number of pages	9
Journal	Liquid Crystals
Volume	50
Issue number	3
DOIs	https://doi.org/10.1080/02678292.2022.2134597
Publication status	Published - 2023

Bibliographical note

Funding Information:
This research was part of the research programme START-UP with project number 740.018.005, which is financed by the Dutch Organization for Scientific Research (NWO). The authors want to thank Anna Casimiro of the Eindhoven University of Technology for her help with the MAXS/WAXS measurements, Lou Xianwen of the Eindhoven University of Technology for his help with MALDI-TOF measurements and Juan Carlos de Galan (Zaragoza University) and Jannet van der Veen (Philips Research) for their assistance with the synthesis of C6-CN and C6-C H . 6 5

Keywords

gas separation
Nematic phase
polymer films
steric size effect

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title = "Nematic liquid crystalline polymer films for gas separation",

abstract = "The gas separation performances of free-standing planar aligned nematic LC polymer films were investigated for gas separations of He, CO2, CH4 and Xe. The films consist of derivatives of 1,4-phenylene bis(4-((6-(acryloyloxy)hexyl)oxy)benzoate)s with respective cyano, chloro, methyl and phenyl substituents on the central aromatic cores. Two new LC derivatives of 1,4-phenylene bis(4-((6-(acryloyloxy)hexyl)oxy)benzoate)s were successfully synthesised and fully characterised. Single gas permeation and sorption data show increasing gas permeabilities with increasing steric size of the substituents while the ideal gas selectivity of He over CH4 and He over CO2 decreases. The sorption coefficient of all films is independent of the LC substituents, while the subsequently extracted diffusion coefficient for the films with a phenyl substituent is three times higher compared to the films with a cyano substituent, demonstrating that the steric size of the LC substituents mainly affects the diffusion of gasses rather than the solubility of the gases. Irrespective of a methyl or a phenyl substituent, a larger kinetic diameter of Xe gives a 20 times lower diffusion coefficient compared to the smaller species (CO2).",

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note = "Funding Information: This research was part of the research programme START-UP with project number 740.018.005, which is financed by the Dutch Organization for Scientific Research (NWO). The authors want to thank Anna Casimiro of the Eindhoven University of Technology for her help with the MAXS/WAXS measurements, Lou Xianwen of the Eindhoven University of Technology for his help with MALDI-TOF measurements and Juan Carlos de Galan (Zaragoza University) and Jannet van der Veen (Philips Research) for their assistance with the synthesis of C6-CN and C6-C H . 6 5 ",

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AU - Schenning, Albert P.H.J.

N1 - Funding Information: This research was part of the research programme START-UP with project number 740.018.005, which is financed by the Dutch Organization for Scientific Research (NWO). The authors want to thank Anna Casimiro of the Eindhoven University of Technology for her help with the MAXS/WAXS measurements, Lou Xianwen of the Eindhoven University of Technology for his help with MALDI-TOF measurements and Juan Carlos de Galan (Zaragoza University) and Jannet van der Veen (Philips Research) for their assistance with the synthesis of C6-CN and C6-C H . 6 5

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N2 - The gas separation performances of free-standing planar aligned nematic LC polymer films were investigated for gas separations of He, CO2, CH4 and Xe. The films consist of derivatives of 1,4-phenylene bis(4-((6-(acryloyloxy)hexyl)oxy)benzoate)s with respective cyano, chloro, methyl and phenyl substituents on the central aromatic cores. Two new LC derivatives of 1,4-phenylene bis(4-((6-(acryloyloxy)hexyl)oxy)benzoate)s were successfully synthesised and fully characterised. Single gas permeation and sorption data show increasing gas permeabilities with increasing steric size of the substituents while the ideal gas selectivity of He over CH4 and He over CO2 decreases. The sorption coefficient of all films is independent of the LC substituents, while the subsequently extracted diffusion coefficient for the films with a phenyl substituent is three times higher compared to the films with a cyano substituent, demonstrating that the steric size of the LC substituents mainly affects the diffusion of gasses rather than the solubility of the gases. Irrespective of a methyl or a phenyl substituent, a larger kinetic diameter of Xe gives a 20 times lower diffusion coefficient compared to the smaller species (CO2).

AB - The gas separation performances of free-standing planar aligned nematic LC polymer films were investigated for gas separations of He, CO2, CH4 and Xe. The films consist of derivatives of 1,4-phenylene bis(4-((6-(acryloyloxy)hexyl)oxy)benzoate)s with respective cyano, chloro, methyl and phenyl substituents on the central aromatic cores. Two new LC derivatives of 1,4-phenylene bis(4-((6-(acryloyloxy)hexyl)oxy)benzoate)s were successfully synthesised and fully characterised. Single gas permeation and sorption data show increasing gas permeabilities with increasing steric size of the substituents while the ideal gas selectivity of He over CH4 and He over CO2 decreases. The sorption coefficient of all films is independent of the LC substituents, while the subsequently extracted diffusion coefficient for the films with a phenyl substituent is three times higher compared to the films with a cyano substituent, demonstrating that the steric size of the LC substituents mainly affects the diffusion of gasses rather than the solubility of the gases. Irrespective of a methyl or a phenyl substituent, a larger kinetic diameter of Xe gives a 20 times lower diffusion coefficient compared to the smaller species (CO2).

KW - gas separation

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VL - 50

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ER -

Nematic liquid crystalline polymer films for gas separation

Abstract

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Keywords

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