Gas-Sorption Properties of 6FDA-Durene/1,4-Phenylenediamine (pPDA) and 6FDA-Durene/1,3-Phenylenediamine (mPDA) Copolyimides

Si Xue Cheng; Tai Shung Chung; Rong Wang; Rohit H. Vora

doi:10.1002/app.12874

Gas-Sorption Properties of 6FDA-Durene/1,4-Phenylenediamine (pPDA) and 6FDA-Durene/1,3-Phenylenediamine (mPDA) Copolyimides

Si Xue Cheng, Tai Shung Chung^*, Rong Wang, Rohit H. Vora

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

38 Scopus citations

Abstract

We investigated the sorption isotherms of O₂, N₂, CH₄, and CO₂ gases in 6FDA-durene, 6FDA-1,4-phenylenediamine (6FDA-pPDA), and 6FDA-1,3-phenylenediamine (6FDA-mPDA) homopolymers and 6FDA-du-rene/pPDA and 6FDA-durene/mPDA copolyimides. The solubilities decrease in the order of the inherent condensabilities of the penetrant gases, namely, CO₂, CH₄, O₂, and N₂. The chemical structures of the polymer, as well as the chain packing, determine the sorption properties of these homopolymers and copolymers. The FDA-durene homopolymer has the highest solubility for all gases because of its high specific free volume and fractional free volume. The solubilities of the copolymers increase with an increasing 6FDA-durene content, while the solubility selectivities of the copolymers only vary slightly. The values of K_D (Henry's law constant) and C_H′ (Langmuir site capacity) of these copolyimides decrease with a decreasing 6FDA-durene content. To our surprise, contradictory to the previous known fact that the mete-connected materials tend to have denser molecular packing than that of the para-linked materials for homopolymers, the 6FDA-durene/mPDA 80/20 copolymer has higher gas solubilities than those of the 6FDA-durene/ pPDA 80/20 copolymer. The random moiety sequence within the copolymer may be the main cause for the abnormal phenomenon.

Original language	English (US)
Pages (from-to)	2187-2193
Number of pages	7
Journal	Journal of Applied Polymer Science
Volume	90
Issue number	8
DOIs	https://doi.org/10.1002/app.12874
State	Published - Nov 21 2003
Externally published	Yes

Keywords

Copolymerization
Gas permeation
Polyimides

ASJC Scopus subject areas

General Chemistry
Surfaces, Coatings and Films
Polymers and Plastics
Materials Chemistry

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title = "Gas-Sorption Properties of 6FDA-Durene/1,4-Phenylenediamine (pPDA) and 6FDA-Durene/1,3-Phenylenediamine (mPDA) Copolyimides",

abstract = "We investigated the sorption isotherms of O2, N2, CH4, and CO2 gases in 6FDA-durene, 6FDA-1,4-phenylenediamine (6FDA-pPDA), and 6FDA-1,3-phenylenediamine (6FDA-mPDA) homopolymers and 6FDA-du-rene/pPDA and 6FDA-durene/mPDA copolyimides. The solubilities decrease in the order of the inherent condensabilities of the penetrant gases, namely, CO2, CH4, O2, and N2. The chemical structures of the polymer, as well as the chain packing, determine the sorption properties of these homopolymers and copolymers. The FDA-durene homopolymer has the highest solubility for all gases because of its high specific free volume and fractional free volume. The solubilities of the copolymers increase with an increasing 6FDA-durene content, while the solubility selectivities of the copolymers only vary slightly. The values of KD (Henry's law constant) and CH′ (Langmuir site capacity) of these copolyimides decrease with a decreasing 6FDA-durene content. To our surprise, contradictory to the previous known fact that the mete-connected materials tend to have denser molecular packing than that of the para-linked materials for homopolymers, the 6FDA-durene/mPDA 80/20 copolymer has higher gas solubilities than those of the 6FDA-durene/ pPDA 80/20 copolymer. The random moiety sequence within the copolymer may be the main cause for the abnormal phenomenon.",

keywords = "Copolymerization, Gas permeation, Polyimides",

author = "Cheng, {Si Xue} and Chung, {Tai Shung} and Rong Wang and Vora, {Rohit H.}",

year = "2003",

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doi = "10.1002/app.12874",

language = "English (US)",

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T1 - Gas-Sorption Properties of 6FDA-Durene/1,4-Phenylenediamine (pPDA) and 6FDA-Durene/1,3-Phenylenediamine (mPDA) Copolyimides

AU - Cheng, Si Xue

AU - Chung, Tai Shung

AU - Wang, Rong

AU - Vora, Rohit H.

PY - 2003/11/21

Y1 - 2003/11/21

N2 - We investigated the sorption isotherms of O2, N2, CH4, and CO2 gases in 6FDA-durene, 6FDA-1,4-phenylenediamine (6FDA-pPDA), and 6FDA-1,3-phenylenediamine (6FDA-mPDA) homopolymers and 6FDA-du-rene/pPDA and 6FDA-durene/mPDA copolyimides. The solubilities decrease in the order of the inherent condensabilities of the penetrant gases, namely, CO2, CH4, O2, and N2. The chemical structures of the polymer, as well as the chain packing, determine the sorption properties of these homopolymers and copolymers. The FDA-durene homopolymer has the highest solubility for all gases because of its high specific free volume and fractional free volume. The solubilities of the copolymers increase with an increasing 6FDA-durene content, while the solubility selectivities of the copolymers only vary slightly. The values of KD (Henry's law constant) and CH′ (Langmuir site capacity) of these copolyimides decrease with a decreasing 6FDA-durene content. To our surprise, contradictory to the previous known fact that the mete-connected materials tend to have denser molecular packing than that of the para-linked materials for homopolymers, the 6FDA-durene/mPDA 80/20 copolymer has higher gas solubilities than those of the 6FDA-durene/ pPDA 80/20 copolymer. The random moiety sequence within the copolymer may be the main cause for the abnormal phenomenon.

AB - We investigated the sorption isotherms of O2, N2, CH4, and CO2 gases in 6FDA-durene, 6FDA-1,4-phenylenediamine (6FDA-pPDA), and 6FDA-1,3-phenylenediamine (6FDA-mPDA) homopolymers and 6FDA-du-rene/pPDA and 6FDA-durene/mPDA copolyimides. The solubilities decrease in the order of the inherent condensabilities of the penetrant gases, namely, CO2, CH4, O2, and N2. The chemical structures of the polymer, as well as the chain packing, determine the sorption properties of these homopolymers and copolymers. The FDA-durene homopolymer has the highest solubility for all gases because of its high specific free volume and fractional free volume. The solubilities of the copolymers increase with an increasing 6FDA-durene content, while the solubility selectivities of the copolymers only vary slightly. The values of KD (Henry's law constant) and CH′ (Langmuir site capacity) of these copolyimides decrease with a decreasing 6FDA-durene content. To our surprise, contradictory to the previous known fact that the mete-connected materials tend to have denser molecular packing than that of the para-linked materials for homopolymers, the 6FDA-durene/mPDA 80/20 copolymer has higher gas solubilities than those of the 6FDA-durene/ pPDA 80/20 copolymer. The random moiety sequence within the copolymer may be the main cause for the abnormal phenomenon.

KW - Copolymerization

KW - Gas permeation

KW - Polyimides

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U2 - 10.1002/app.12874

DO - 10.1002/app.12874

M3 - Article

AN - SCOPUS:0142157492

SN - 0021-8995

VL - 90

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JO - Journal of Applied Polymer Science

JF - Journal of Applied Polymer Science

IS - 8

ER -

Gas-Sorption Properties of 6FDA-Durene/1,4-Phenylenediamine (pPDA) and 6FDA-Durene/1,3-Phenylenediamine (mPDA) Copolyimides

Abstract

Keywords

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