Thermo-responsive and Antifouling PVDF Nanocomposited Membranes Based on PNIPAAm Modified TiO2 Nanoparticles

A novel hydrophilic nanocomposite additive （TiO2-g-PNIPAAm） was synthesized by the surface modification of titanium dioxide （TiO2） with N-isopropylacrylamide （NIPAAm） via ＂graft-from＂ technique. And the nanocomposite membrane of poly（vinylidene fluoride） （PVDF）/TiO2-g-PNIPAAm was fabricated by wet p...

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Bibliographic Details
Published in:Chinese journal of polymer science 2014-07, Vol.32 (7), p.892-905
Main Authors: Zhou, Qing, Li, Jian-hua, Yan, Bang-feng, Wu, Dong, Zhang, Qi-qing
Format: Article
Language:English
Subjects:
Antifouling
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Contact angle
Grafting
Industrial Chemistry/Chemical Engineering
Membranes
N-异丙基丙烯酰胺
Nanoparticles
Nanostructure
PNIPAAm
Polymer Sciences
Polyvinylidene fluorides
PVDF膜
TiO2
Titanium dioxide
热响应
纳米微粒
聚偏氟乙烯膜
防污性
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Summary:A novel hydrophilic nanocomposite additive （TiO2-g-PNIPAAm） was synthesized by the surface modification of titanium dioxide （TiO2） with N-isopropylacrylamide （NIPAAm） via ＂graft-from＂ technique. And the nanocomposite membrane of poly（vinylidene fluoride） （PVDF）/TiO2-g-PNIPAAm was fabricated by wet phase inversion. The graft degree was obtained by thermo-gravimetric analysis （TGA）. Fourier transform infrared attenuated reflection spectroscopy （FTIR-ATR） and X-ray photoelectronic spectroscopy （XPS） characterization results suggested that TiO2-g-PNIPAAm nanoparticles segregated on membrane surface during the phase separation process. Scanning electron microscopy （SEM） was conducted to investigate the surface and cross-section of the modified membranes. The water contact angle measurements confirmed that TiO2-g-PNIPAAm nanoparticles endowed PVDF membranes better hydrophlilicity and thermo-responsive properties compared with those of the pristine PVDF membrane. The water contact angle decreased from 92.8~ of the PVDF membrane to 61.2~ of the nanocompostie membrane. Bovine serum albumin （BSA） static and dynamic adsorption experiments suggested that excellent antifouling properties of membranes was acquired after adding TiO2-g- PNIPAAm. The maximum BSA adsorption at 40℃ was about 3 times than that at 23 ℃. The permeation experiments indicated the water flux recover ratio and BSA rejection ratio were improved at different temperatures.
ISSN:0256-7679
1439-6203
DOI:10.1007/s10118-014-1457-2