Citation: Qing Zhou, Jian-hua Li, Bang-feng Yan, Dong Wu, Qi-qing Zhang. Thermo-responsive and Antifouling PVDF Nanocomposited Membranes Based on PNIPAAm Modified TiO2 Nanoparticles[J]. Chinese Journal of Polymer Science, ;2014, 32(7): 892-905. doi: 10.1007/s10118-014-1457-2 shu

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

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Institute of Biomedical and Pharmaceutical Technology and College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou 350001, China
2.
School of Stomatology, Affiliated Stomatological Hospital, Fujian Medical University, Fuzhou 350001, China

Received Date: 24 October 2013
Revised Date: 13 January 2014

Fund Project: This work was financially supported by the National Natural Science Foundation of China (No. 51303028) and the Natural Science Foundation of Fujian Province (No. 2011J01044)

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.
- PVDF membrane,
- TiO2-g-PNIPAAm nanoparticle,
- Thermo-responsive,
- Antifouling
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1.
沈阳化工大学材料科学与工程学院沈阳 110142