Cross-Linked Polycarbonate Microfiltration Membranes with Improved Solvent Resistance

Area of Science:

• Materials Science
• Polymer Chemistry
• Chemical Engineering

Background:

• Polycarbonate membranes often lack resistance to organic solvents, limiting their application in chemical separations.
• Developing robust membranes is crucial for efficient industrial processes involving organic solvents.

Purpose of the Study:

• To create an organic solvent-resistant polycarbonate membrane.
• To enhance the thermal and mechanical stability of the membrane.
• To evaluate the membrane's performance in organic solvent filtration.

Main Methods:

• Formation of urethane bonds between polycarbonate and polyethyleneimine.
• Cross-linking the modified membrane with 1,4-butanediol diglycidyl ether (BDG).
• Testing the membrane's swelling degree, mechanical strength, thermal stability, permeance, and rejection.

Main Results:

• The cross-linked membrane showed excellent resistance to various organic solvents, with a maximum swelling degree of only 6%.
• Improved mechanical and thermal stability were observed compared to unmodified membranes.
• The modified membrane demonstrated high permeance and rejection performance.

Conclusions:

• 1,4-butanediol diglycidyl ether (BDG) is an effective cross-linker for enhancing polycarbonate membrane properties.
• The developed membrane is suitable for organic solvent filtration applications.
• This modification offers a pathway to broaden the utility of polycarbonate membranes in demanding environments.