Patent ID: 8561812
Filing Date: 2013-10-22
Classification: B01D,C08G,C08J,C08L

Abstract:
1. A process for making a blend polymer membrane consisting of synthesizing a first glassy polymer wherein said first glassy polymer is an aromatic polyimide comprising pendent functional groups ortho to heterocyclic imide nitrogen in a polymer backbone of said aromatic polyimide; fabricating a blend polymer membrane from said first glassy polymer and a second glassy polymer, different from said first glassy polymer; and converting the blend polymer membrane to a thermally rearranged blend polymer membrane by heating said blend polymer membrane at a temperature from about 300 to 600° C. such that under operating conditions of a separation using the blend polymer membrane the operating temperature is lower than the glass transition temperatures of both glassy polymers of the blend polymer membrane wherein said blend polymer membrane fabricated from said first glassy polymer and said second glassy polymer by heat treatment to a crosslinking step.