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POLYCONDENSATION STOICHIOMETRY CONTROL

  • US 20190315922A1
  • Filed: 04/12/2019
  • Published: 10/17/2019
  • Est. Priority Date: 04/17/2018
  • Status: Abandoned Application
First Claim
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1. A method of making a polyetherimide comprising:

  • setting a target range for the anhydride-amine stoichiometry in a reaction mixture;

    combining a solvent, a diamine, a bis(ether anhydride), and an optional end capping agent to form the reaction mixture wherein the reaction mixture has a polyamic acid content;

    analyzing the amine and anhydride end group content of the reaction mixture using near infrared vibrational spectroscopy;

    calculating the anhydride-amine stoichiometry;

    comparing the calculated anhydride-amine stoichiometry to the target stoichiometry, and, when necessary, adjusting the concentration of bis(ether anhydride) or diamine based on the comparison of the calculated anhydride-amine stoichiometry to the target stoichiometry.

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