Grafting of temperature sensitive PNIPAAm on hydrophilised polysulfone UF membranes

Mehrdad Hesampour, Tiina Huuhilo, Katri Mäkinen, Mika Mänttäri, Marianne Nyström

Research output: Contribution to journalArticleScientificpeer-review

35 Citations (Scopus)

Abstract

Poly(N-isopropyl acrylamide) (PNIPAAm) was grafted on a polysulfone UF membrane. The changes of permeability as well as retention of PEG (35 kg/mol) and Dextran (500 kg/mol) between 23 and 60 °C were determined for both grafted and unmodified membranes. The results showed that the viscosity corrected water permeability and solute retention were almost constant for the unmodified membranes within the measured temperature range, the permeability of the grafted membranes increased and the retention of Dextran and PEG decreased with temperature. The variation of changes was most obvious in the temperature range 27–37 °C for the modified membranes due to the lower critical solution temperature (LCST) of PNIPAAm. The location and profile of PNIPAAm inside and on the surface of the membrane were analysed by SEM and FTIR. Depth profile calculation for FTIR spectra showed that PNIPAAm was mostly placed inside the membrane (at a depth of 1.06–1.10 μm from the surface) rather than on the surface. The amount of grafted PNIPAAm was low and did not significantly affect the morphology of the membrane. Therefore, a difference in SEM pictures of modified and unmodified membranes could not be seen. The modified membrane exhibited a clearly different thermal response compared to the unmodified one.
Original languageEnglish
Pages (from-to)85-92
JournalJournal of Membrane Science
Volume310
Issue number1-2
DOIs
Publication statusPublished - 2008
MoE publication typeA1 Journal article-refereed

Fingerprint

Polysulfones
membranes
Membranes
Temperature
temperature
Permeability
permeability
dextrans
Dextran
Fourier Transform Infrared Spectroscopy
Dextrans
Polyethylene glycols
polysulfone P 1700
poly-N-isopropylacrylamide
Scanning electron microscopy
scanning electron microscopy
profiles
Viscosity
solutes
Hot Temperature

Keywords

  • Hydrophilic
  • UF
  • PNIPAAm
  • Permeability
  • Thermo-sensitive

Cite this

Hesampour, Mehrdad ; Huuhilo, Tiina ; Mäkinen, Katri ; Mänttäri, Mika ; Nyström, Marianne. / Grafting of temperature sensitive PNIPAAm on hydrophilised polysulfone UF membranes. In: Journal of Membrane Science. 2008 ; Vol. 310, No. 1-2. pp. 85-92.
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title = "Grafting of temperature sensitive PNIPAAm on hydrophilised polysulfone UF membranes",
abstract = "Poly(N-isopropyl acrylamide) (PNIPAAm) was grafted on a polysulfone UF membrane. The changes of permeability as well as retention of PEG (35 kg/mol) and Dextran (500 kg/mol) between 23 and 60 °C were determined for both grafted and unmodified membranes. The results showed that the viscosity corrected water permeability and solute retention were almost constant for the unmodified membranes within the measured temperature range, the permeability of the grafted membranes increased and the retention of Dextran and PEG decreased with temperature. The variation of changes was most obvious in the temperature range 27–37 °C for the modified membranes due to the lower critical solution temperature (LCST) of PNIPAAm. The location and profile of PNIPAAm inside and on the surface of the membrane were analysed by SEM and FTIR. Depth profile calculation for FTIR spectra showed that PNIPAAm was mostly placed inside the membrane (at a depth of 1.06–1.10 μm from the surface) rather than on the surface. The amount of grafted PNIPAAm was low and did not significantly affect the morphology of the membrane. Therefore, a difference in SEM pictures of modified and unmodified membranes could not be seen. The modified membrane exhibited a clearly different thermal response compared to the unmodified one.",
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Hesampour, M, Huuhilo, T, Mäkinen, K, Mänttäri, M & Nyström, M 2008, 'Grafting of temperature sensitive PNIPAAm on hydrophilised polysulfone UF membranes', Journal of Membrane Science, vol. 310, no. 1-2, pp. 85-92. https://doi.org/10.1016/j.memsci.2007.10.038

Grafting of temperature sensitive PNIPAAm on hydrophilised polysulfone UF membranes. / Hesampour, Mehrdad; Huuhilo, Tiina; Mäkinen, Katri; Mänttäri, Mika; Nyström, Marianne.

In: Journal of Membrane Science, Vol. 310, No. 1-2, 2008, p. 85-92.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Grafting of temperature sensitive PNIPAAm on hydrophilised polysulfone UF membranes

AU - Hesampour, Mehrdad

AU - Huuhilo, Tiina

AU - Mäkinen, Katri

AU - Mänttäri, Mika

AU - Nyström, Marianne

PY - 2008

Y1 - 2008

N2 - Poly(N-isopropyl acrylamide) (PNIPAAm) was grafted on a polysulfone UF membrane. The changes of permeability as well as retention of PEG (35 kg/mol) and Dextran (500 kg/mol) between 23 and 60 °C were determined for both grafted and unmodified membranes. The results showed that the viscosity corrected water permeability and solute retention were almost constant for the unmodified membranes within the measured temperature range, the permeability of the grafted membranes increased and the retention of Dextran and PEG decreased with temperature. The variation of changes was most obvious in the temperature range 27–37 °C for the modified membranes due to the lower critical solution temperature (LCST) of PNIPAAm. The location and profile of PNIPAAm inside and on the surface of the membrane were analysed by SEM and FTIR. Depth profile calculation for FTIR spectra showed that PNIPAAm was mostly placed inside the membrane (at a depth of 1.06–1.10 μm from the surface) rather than on the surface. The amount of grafted PNIPAAm was low and did not significantly affect the morphology of the membrane. Therefore, a difference in SEM pictures of modified and unmodified membranes could not be seen. The modified membrane exhibited a clearly different thermal response compared to the unmodified one.

AB - Poly(N-isopropyl acrylamide) (PNIPAAm) was grafted on a polysulfone UF membrane. The changes of permeability as well as retention of PEG (35 kg/mol) and Dextran (500 kg/mol) between 23 and 60 °C were determined for both grafted and unmodified membranes. The results showed that the viscosity corrected water permeability and solute retention were almost constant for the unmodified membranes within the measured temperature range, the permeability of the grafted membranes increased and the retention of Dextran and PEG decreased with temperature. The variation of changes was most obvious in the temperature range 27–37 °C for the modified membranes due to the lower critical solution temperature (LCST) of PNIPAAm. The location and profile of PNIPAAm inside and on the surface of the membrane were analysed by SEM and FTIR. Depth profile calculation for FTIR spectra showed that PNIPAAm was mostly placed inside the membrane (at a depth of 1.06–1.10 μm from the surface) rather than on the surface. The amount of grafted PNIPAAm was low and did not significantly affect the morphology of the membrane. Therefore, a difference in SEM pictures of modified and unmodified membranes could not be seen. The modified membrane exhibited a clearly different thermal response compared to the unmodified one.

KW - Hydrophilic

KW - UF

KW - PNIPAAm

KW - Permeability

KW - Thermo-sensitive

U2 - 10.1016/j.memsci.2007.10.038

DO - 10.1016/j.memsci.2007.10.038

M3 - Article

VL - 310

SP - 85

EP - 92

JO - Journal of Membrane Science

JF - Journal of Membrane Science

SN - 0376-7388

IS - 1-2

ER -