The sequenced structure of amino-alcohol-based random poly(ester amide)s

Abstract

Random amino-alcohol-based poly(ester amide)s were synthesized using adipic acid and differently substituted amino-alcohols, namely 2-amino-ethan-1-ol, 1-amino-propan-2-ol, 2-amino-butan-1-ol and 2-amino-2-methyl-propan-1-ol. The effect of substitution on the yield and fine structure was investigated using residual functional group analysis, SEC and NMR. The functional group analysis and SEC proved the blocking effect of small substituents on direct polycondensation. The NMR data suggested a sequenced structure that could cause the formation of different crystalline phases in linear amino-alcohol-based poly(ester amide)s. Three different crystalline phases with different thermal stability and crystallization rate were observed with DSC and WAXS. The crystalline nature of the poly(ester amide)s proves the sequenced organization along the backbone.