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Preparation of Functional Polymeric Membrane and Application in Electro-synthesis Process

Author: ShiSuYu
Tutor: ChenZhen
School: Fujian Normal University
Course: Polymer Chemistry and Physics
Keywords: Bipolar membrane electro-oxidation Copper Phthalocyanine acetyl ferrocene phosphorylation
CLC: TB383.2
Type: Master's thesis
Year: 2010
Downloads: 58
Quote: 0
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Abstract


PAA was blended with Carboxymethyl Cellulose (CMC) and then cross-linked by Cr3+ to prepare mPAA/CMC. Chitosan (CS) was cross-linked by glutaraldehyde (GA) and di-n-butyltin dichloride. mPAA/CMC-mCS bipolar membrane was prepared by casting technique. IR spectrum indicated that the anion and cation membranes contain-NRH2+,-COO- functional groups, respectively. It had high ion exchange capacity and good permeability. The mPAA/CMC-mCS bipolar membrane was applied in the electro-synthesis of TMAH.Sodium alginate was modified by phosphorus pentaoxide, triethyl phosphate, phosphoric acid and Cr3+ to prepare the phosphorylated cation membrane (mSA); Polyacrylamid was modified by formaldehyde and dimethylamine to prepare a sol of an anion membrane (mPAM). The sol of the anion membrane was pasted on the cation membrane to prepare the mSA/mPAM bipolar membrane. The results of FTIR and contact angle show that the hydrophilic properties of the mSA were improved after modification. The high ion exchange capacities as well as good permeability properties were investigated. The mSA/mPAM bipolar membrane was used as a separator in the electrolysis cell for the electro-oxidation of dialdehydle starch.Polyethylene glycol (PEG) with flexible chains was blended with cation-exchange membrane carboxymethyl cellulose (CMC) and anion-exchange membrane chitosan (CS) in order to enhance the compatibility and mechanical properties. Then CMC and CS were modified by Copper multicarboxylphthalocyanine(CuPc) and acetyl ferrocene respectively. CuPc-mCMC/mCS bipolar membrane was prepared by a pasting method. The results of swelling degree and TGA show that the properties of CuPc-mCMC/mCS bipolar membrane are improved after modification. Both of the membrane impedance and the working voltage of CuPc-mCMC/mCS bipolar membrane are small. And the CuPc-mCMC/mCS bipolar membrane exhibits a higher ion penetrability after modification. In the electrolytic cell with CuPc-mCMC/mCS biplor membrane and Nafion membrane as a separator respectively, the electro-generated nanometer MnO2 under ultrasonic high-frequency oscillation dispersed in the solution, and then could be used as an oxidation mediator for oxidation of diethylene glycol to diglycolic acid. The results show that reaction temperature, time and current density have an important influence on yield and current efficiency. And the yield of diglycolic acid prepared using CuPc-mCMC/mCS biplor membrane reaches 90.2% after 2.5h under 60℃at 17mA·cm-2, which is higher than that of Nafion membrane under the same conditions.

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