Title of article :
Thermo-responsive gating membranes with controllable length and density of poly(N-isopropylacrylamide) chains grafted by ATRP method
Author/Authors :
Peng-Fei Li، نويسنده , , Rui Xie، نويسنده , , Jun-Chao Jiang، نويسنده , , Tao Meng، نويسنده , , Mei Yang، نويسنده , , Xiao-Jie Ju، نويسنده , , Lihua Yang، نويسنده , , Liang-Yin Chu ، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2009
Pages :
8
From page :
310
To page :
317
Abstract :
A series of thermo-responsive gating membranes with controllable length and density of grafted polymer chains are prepared by grafting poly(N-isopropylacrylamide) (PNIPAM) chains in the pores of anodic aluminum oxide (AAO) porous membranes with atom-transfer radical polymerization (ATRP) method. Effects of grafting temperature, grafting time, feed concentration of monomer, and density of –Br on the grafting yields of AAO-g-PNIPAM membranes are systematically investigated. The thermo-responsive characteristics of AAO-g-PNIPAM gating membranes with different lengths and densities of grafted PNIPAM chains are investigated by tracking the diffusional permeation of vitamin B12 at temperatures below and above the lower critical solution temperature. The results show that thermo-responsive characteristics of the AAO-g-PNIPAM membranes are heavily affected by both the length and density of grafted PNIPAM chains in the membrane pores, and the effect of the length of grafted PNIPAM chains is more significant than that of the density. The results demonstrate that, to obtain desired performances of gating membranes, it is essential to design and fabricate grafted PNIPAM chains with proper length and density.
Keywords :
Gating membranes , Thermo-response , Atom-transfer radical polymerization (ATRP) , Graft polymerization , Diffusional permeability
Journal title :
Journal of Membrane Science
Serial Year :
2009
Journal title :
Journal of Membrane Science
Record number :
1354591
Link To Document :
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