ON THE VALIDITY OF THE UNIVERSAL CALIBRATION CONCEPT IN THE SEC ANALYSIS OF POLYAMIDES

摘要

The molecular mass determination for polyamides is very difficult due to the insolubility of polymers in common solvents; high temperature and special solvents were used until Schulz proposed the N-trifluoroacetilation reaction. The modified polymer is soluble in THF, CH_2Cl_2 or other chlorinated anydrous solvents. Sec analyses are correct if the degree of N-trifluoroacetylation is higher than 0.95%. The used column sets do not allow a definitive demonstration of whether the universal calibration concept is valid in polyamide analysed.