Abstract
To prepare a porous cellulose acetate (CA) for application as a battery separator, Cd(NO3)2·4H2O was utilized with water-pressure as an external physical force. When the CA was complexed with Cd(NO3)2·4H2O and exposed to external water-pressure, the water-flux through the CA was observed, indicating the generation of pores in the polymer. Furthermore, as the hydraulic pressure increased, the water-flux increased proportionally, indicating the possibility of control for the porosity and pore size. Surprisingly, the value above 250 LMH (L/m2h) observed at the ratio of 1:0.35 (mole ratio of CA: Cd(NO3)2·4H2O) was of higher flux than those of CA/other metal nitrate salts (Ni(NO3)2 and Mg(NO3)2) complexes. The higher value indicated that the larger and abundant pores were generated in the cellulose acetate at the same water-pressure. Thus, it could be thought that the Cd(NO3)2·4H2O salt played a role as a stronger plasticizer than the other metal nitrate salts such as Ni(NO3)2 and Mg(NO3)2. These results were attributable to the fact that the atomic radius and ionic radius of the Cd were largest among the three elements, resulting in the relatively larger Cd of the Cd(NO3)2 that could easily be dissociated into cations and NO3− ions. As a result, the free NO3− ions could be readily hydrated with water molecules, causing the plasticization effect on the chains of cellulose acetate. The coordinative interactions between the CA and Cd(NO3)2·4H2O were investigated by IR spectroscopy. The change of ionic species in Cd(NO3)2·4H2O was analyzed by Raman spectroscopy.
Highlights
Nanoporous materials have received much attention for their possibilities of being utilized for gas separation, catalysis, battery separators, medicine, and water treatment [1,2]
A porous polymer matrix was successfully fabricated by Cd(NO3 )2 ·4H2 O and external physical
A porous polymer matrix was successfully fabricated by Cd(NO3)2·4H2O and external physical forces as shown in Scheme 1
Summary
Nanoporous materials have received much attention for their possibilities of being utilized for gas separation, catalysis, battery separators, medicine, and water treatment [1,2]. Low thermal stability played a role as an obstacle for practical applications To overcome these drawbacks, porous inorganic material, nanoparticle, high thermal-resistance polymer and separator coated thermal material have been used as separator [15,16,17]. Some problems of these methods are the complications and the high-cost of the process To solve these drawbacks, our group reported the method to fabricate pores using the ionic liquid and solvated inorganic complex [25,26]. We suggested the environment-friendly and energy-efficient method to synthesize the pores, which is close to the straight type in a cellulose acetate (CA) polymer matrix [27], using a combination of inorganic complex (Cd(NO3 )2 ·4H2 O) and isostatic water pressure. We investigated the effect of the ionic radius in metal nitrate on both the pore generation and pore control of cellulose acetate
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