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A non-woven polypropylene supported bovine serum albumin imprinted calcium alginate/polyacrylamide hydrogel film with good regeneration performance.

Titanium dioxide (TiO2) nanoparticles were dispersed in the sodium alginate and acrylamide aqueous solution to prepare the casting solution. The casting solution was spread on a glass plate by a glass rod enlaced with brass wires to control the thickness of the film. Then polyacrylamide/calcium alginate/TiO2 (PAM/CA/T) composite film was obtained after UV irradiation and crosslinking by CaCl2. The PAM/CA/T film was characterized by scanning electron microscopy and transmission electron microscope. The mechanical properties of the films were tested in wet form and the results showed that PAM/CA/T film had good strength and toughness. PAM/CA/T films did not rupture after swelling in 5.0 wt% NaCl solution and still had good mechanical properties. The PAM/CA/T hydrogel film provided a suitable carrier for TiO2 in the photocatalytic degradation of dyes and the degradation rate of PAM/CA/T‐30 for methyl orange reached 80.8%. The PAM/CA/T film had good reusability and could degrade dyes in a high concentration of NaCl solution. POLYM. COMPOS. 37:1292–1301, 2016. © 2014 Society of Plastics Engineers

Schematic representation of the fabrication procedure of the CA film based MIP.

Tricalcium phosphate-calcium alginate (TCP-CA) composite flat sheet membranes with the thickness of 150-200 lm were prepared by Ca 21 crosslinking of TCP and sodium alginate (SA) aqueous solution. The composite flat sheet membranes were characterized by SEM, FTIR, DSC and BET method. The mechanical properties of the membranes were tested with a tensile testing machine in wet form. Hemoglobin (HB) was immobilized in the following four matrices (1) HB was adsorbed onto the TCP powders directly, (2) HB and SA dissolved together, and then crosslinked by CaCl 2 , (3) HB was pre-adsorbed onto TCP powders, and then mixed with SA aqueous solution, finally crosslinked by CaCl 2 , (4) HB and TCP powders were individually dispersed in the SA aqueous solution and then crosslinked by CaCl 2 . The release behaviors of the four materials were investigated in phosphate buffer (pH 5 6.86), Tris-HCl solution (pH 5 7.4) and NaCl solution (0.9 wt%). SEM observation showed that the TCP particles were well embedded and homogeneously distributed in the alginate matrix. DSC and FTIR indicated that there were additional interactions between the TCP and the polymer. TCP can improve the mechanical properties of CA membranes and the swelling ratio of TCP-CA membrane in NaCl solution decreased with the increase of TCP content. The sustained release behaviors of matrix 3 were shown in PBS, Tris-HCl and NaCl solutions. POLYM. COMPOS., 36:1899COMPOS., 36: -1906COMPOS., 36: , 2015