A bipolar membrane is a polymeric layered structure composed of a cation ion-exchange layer and an anion ionexchange layer.With respect to commercial applications

a bipolar membrane has high selectivity

low potential drop

acid and base resistance

solvent resistance

a wide pH range and good mechanical strength.mCMC-PEG/mCS-PEG bipolar membrane was prepared by a paste method

which was prepared by a blend of sodium carboxymethyl cellubse-plyethylene glycol (CMC-PEG) and a blend of chitosanplyethylene glycol (CS-PEG)

which were modified by Fe3+ and glutaraldehyde (GA) as linking reagents

respectively.FTIR was applied to analysis the function groups of the bipolar membrane.Furthermore

the cross-section SEM photographs of the bipolar membrane illustrated a structure that consists of anion layer (mCS-PEG membrane) and cation layer (mCMCPEG membrane).The charge densities of mCMC-PEG and mCS-PEG solutions were determined by the colloid titration.The water ratio

ion exchange capacity and swelling degree of mCMC-PEG membrane and mCSPEG membrane were investigated.The currentvoltage (I-V) curve across mCMC-PEG/mCS-PEG bipolar membrane was measured.The experiment results showed that CS-PEG and CMC-PEG blends appeared better compatibility and the introduction of PEG was beneficial to enhance the ionic exchange capacity and decrease the swelling degree of membrane.When mass ratio of CMC/PEG was 10/1 and CS/PEG was 2/1

mCMC-PEG layer and mCSPEG layer were agglutinated tightly.The mCMCPEG/mCS-PEG bipolar membrane appeared excellent electrochemical properties and high mechanical strength in acid and alkali solution.Meanwhile TG analysis of mCMC-PEG/mCS-PEG bipolar membranes exhibited a good thermal stability.mCMC-PEG/mCS-PEG bipolar membranes were used as the separator in the electrolysis cell for electro-generation organic acid.