Please use this identifier to cite or link to this item: https://doi.org/10.1021/la020241f
Title: Synthesis and characterization of poly(N-isopropylacrylamide)-graft-poly(vinylidene fluoride) copolymers and temperature-sensitive membranes
Authors: Ying, L.
Kang, E.T. 
Neoh, K.G. 
Issue Date: 6-Aug-2002
Source: Ying, L., Kang, E.T., Neoh, K.G. (2002-08-06). Synthesis and characterization of poly(N-isopropylacrylamide)-graft-poly(vinylidene fluoride) copolymers and temperature-sensitive membranes. Langmuir 18 (16) : 6416-6423. ScholarBank@NUS Repository. https://doi.org/10.1021/la020241f
Abstract: Molecular modification of ozone-pretreated poly(vinylidene fluoride) (PVDF) via thermally induced graft copolymerization with N-isopropylacrylamide (NIPAAM) in N-methyl-2-pyrrolidone solution was carried out (the NIPAAM-g-PVDF copolymer). The chemical structure and composition of the NIPAAM-g-PVDF copolymers were characterized by Fourier transform infrared spectroscopy, elemental analysis, and thermogravimetric analysis. In general, the graft concentration increased with the NIPAAM monomer concentration used for graft copolymerization. Micro filtration membranes were prepared from the NIPAAM-g-PVDF copolymers by the phase inversion method. The bulk and surface graft concentrations of the membranes were obtained by elemental analysis and X-ray photoelectron spectroscopy (XPS), respectively. XPS analyses of the copolymer membranes revealed a substantial surface enrichment of the grafted NIPAAM polymer. The pore sizes of the pristine PVDF and the NIPAAM-g-PVDF membranes were measured using a Coulter Porometer. The morphology of the membranes was studied by scanning electron microscopy. The membrane surface composition, mean pore size, and morphology varied with the temperature of the casting bath. For the copolymer membrane cast below the lower critical solution temperature (LCST) of the NIPAAM polymer (∼32 °C), the rate of water permeation increased substantially at a permeate temperature above 32 °C. A reverse permeate temperature dependence was observed for the flux of 2-propanol through the membrane cast above the LCST of the NIPAAM polymer.
Source Title: Langmuir
URI: http://scholarbank.nus.edu.sg/handle/10635/66855
ISSN: 07437463
DOI: 10.1021/la020241f
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

85
checked on Dec 7, 2017

WEB OF SCIENCETM
Citations

81
checked on Nov 22, 2017

Page view(s)

22
checked on Dec 11, 2017

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.