Thermoplastic elastomers 1. Poly(ether-ester-imide)s based on 1,4-diaminobutane, trimellitic anhydride, 1,4-dihydroxybutane and poly(tetramethylene oxide) diols

Abstract

Starting from 1,4-diaminobutane and trimellitic anhydride a bisimide dicarboxylic acid was prepd. which was transformed into its di-Et ester. This imide monomer was polycondensed with mixts. of 1,4-dihydroxybutane and poly(tetramethylene oxide) (PTMO) diols having no. av. mol. wts. (Mns) of 650, 1000 or 2000 Da. For each PTMO diol, the wt. fraction of the hard segments was varied from 30 over 40 and 50-60%. For the PTMO diols 1000 and 2000, macrophase sepn. was obsd. during polycondensation. This problem was solved in the case of PTMO-1000 by a PTMO diol of greater polydispersity. The chem. structure of the poly(ether-ester-imide)s, PEEIs, was characterized by IR and 1H NMR spectroscopy. The phase transitions were identified by DSC and DMTA measurements, which revealed that all members of this series were slowly crystg. materials. The mech. properties were detd. by stress-strain and hysteresis measurements. Macrophase sepn. during the polycondensation was reflected in poorer mech. properties. [on SciFinder (R)