Influence of structural modification on the properties of poly(amide–imide)s

In this study, the influence of length of flexible groups on the properties of poly(amide–imide)s (PAIs), three-model polymers (poly(amide–imide)-4-aminobutyric acid, poly(amide–imide)-6-aminocaproic acid, and poly(amide–imide)-11-aminoundecanoic acid) possessing different flexible methylene units ((CH 2 ) 3 , (CH 2 ) 5 , and (CH 2 ) 10 ) in the main chain were designed. With increasing the number of methylene units, it is found that the tensile...