Elucidating the effect of chain extenders substituted by aliphatic side chains on morphology and gas separation of polyurethanes

Afsaneh Fakhar*, Morteza Sadeghi*, Mohammad Dinari*, Mohammadmahdi Zarabadipoor*, Rob Lammertink*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Novel poly(urethane-urea) (PUU) membranes were developed as the aim of a structure-property relationship study to enhance gas permeation. Designing the PUUs was followed by three synthesized chain extenders with different length-alkyl side chains, polytetramethylene glycol, and isophorone and hexamethylene diisocyanates. The longest substituted PUU indicated higher phase separation and lower glass transition temperature. Pure and mixed gas permeabilities of prepared membranes grew as phase separation of PUU material increased, while fractional free volume decreased by lengthening the side chain of the PUUs. The reasons for this event were the migration of the side chains to the surface of hard domain, thereby shielding it and filling the soft/hard interface. Enhanced permeability of materials with longer side chains is attributed to its plasticizing effect. The highest CO2 permeability (287 barrer) was obtained for the longest substituted PUU. The findings revealed an increase in gas permeation without a significant reduction of selectivity by longer substituted PUUs.

Original languageEnglish
Article number109346
JournalEuropean polymer journal
Volume122
DOIs
Publication statusPublished - 5 Jan 2020

Fingerprint

Polyurethanes
Permeation
Phase separation
Gases
Membranes
Gas permeability
Urethane
Free volume
Glycols
permeability
gases
Urea
Shielding
membranes
diisocyanates
urethanes
ureas
glass transition temperature
shielding
glycols

Keywords

  • UT-Hybrid-D
  • Chain mobility
  • Gas separation membranes
  • Phase separation
  • Polyurethane
  • Aliphatic side chain

Cite this

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title = "Elucidating the effect of chain extenders substituted by aliphatic side chains on morphology and gas separation of polyurethanes",
abstract = "Novel poly(urethane-urea) (PUU) membranes were developed as the aim of a structure-property relationship study to enhance gas permeation. Designing the PUUs was followed by three synthesized chain extenders with different length-alkyl side chains, polytetramethylene glycol, and isophorone and hexamethylene diisocyanates. The longest substituted PUU indicated higher phase separation and lower glass transition temperature. Pure and mixed gas permeabilities of prepared membranes grew as phase separation of PUU material increased, while fractional free volume decreased by lengthening the side chain of the PUUs. The reasons for this event were the migration of the side chains to the surface of hard domain, thereby shielding it and filling the soft/hard interface. Enhanced permeability of materials with longer side chains is attributed to its plasticizing effect. The highest CO2 permeability (287 barrer) was obtained for the longest substituted PUU. The findings revealed an increase in gas permeation without a significant reduction of selectivity by longer substituted PUUs.",
keywords = "UT-Hybrid-D, Chain mobility, Gas separation membranes, Phase separation, Polyurethane, Aliphatic side chain",
author = "Afsaneh Fakhar and Morteza Sadeghi and Mohammad Dinari and Mohammadmahdi Zarabadipoor and Rob Lammertink",
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doi = "10.1016/j.eurpolymj.2019.109346",
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journal = "European polymer journal",
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Elucidating the effect of chain extenders substituted by aliphatic side chains on morphology and gas separation of polyurethanes. / Fakhar, Afsaneh; Sadeghi, Morteza; Dinari, Mohammad; Zarabadipoor, Mohammadmahdi; Lammertink, Rob.

In: European polymer journal, Vol. 122, 109346, 05.01.2020.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Elucidating the effect of chain extenders substituted by aliphatic side chains on morphology and gas separation of polyurethanes

AU - Fakhar, Afsaneh

AU - Sadeghi, Morteza

AU - Dinari, Mohammad

AU - Zarabadipoor, Mohammadmahdi

AU - Lammertink, Rob

N1 - Elsevier deal

PY - 2020/1/5

Y1 - 2020/1/5

N2 - Novel poly(urethane-urea) (PUU) membranes were developed as the aim of a structure-property relationship study to enhance gas permeation. Designing the PUUs was followed by three synthesized chain extenders with different length-alkyl side chains, polytetramethylene glycol, and isophorone and hexamethylene diisocyanates. The longest substituted PUU indicated higher phase separation and lower glass transition temperature. Pure and mixed gas permeabilities of prepared membranes grew as phase separation of PUU material increased, while fractional free volume decreased by lengthening the side chain of the PUUs. The reasons for this event were the migration of the side chains to the surface of hard domain, thereby shielding it and filling the soft/hard interface. Enhanced permeability of materials with longer side chains is attributed to its plasticizing effect. The highest CO2 permeability (287 barrer) was obtained for the longest substituted PUU. The findings revealed an increase in gas permeation without a significant reduction of selectivity by longer substituted PUUs.

AB - Novel poly(urethane-urea) (PUU) membranes were developed as the aim of a structure-property relationship study to enhance gas permeation. Designing the PUUs was followed by three synthesized chain extenders with different length-alkyl side chains, polytetramethylene glycol, and isophorone and hexamethylene diisocyanates. The longest substituted PUU indicated higher phase separation and lower glass transition temperature. Pure and mixed gas permeabilities of prepared membranes grew as phase separation of PUU material increased, while fractional free volume decreased by lengthening the side chain of the PUUs. The reasons for this event were the migration of the side chains to the surface of hard domain, thereby shielding it and filling the soft/hard interface. Enhanced permeability of materials with longer side chains is attributed to its plasticizing effect. The highest CO2 permeability (287 barrer) was obtained for the longest substituted PUU. The findings revealed an increase in gas permeation without a significant reduction of selectivity by longer substituted PUUs.

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KW - Chain mobility

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