Polyestereamide 6NT6: polycondensation kinetics, d.s.c. and n.m.r. studies of thermally treated samples

Poly(ethylene terephthalate) modified with aromatic bisester diamides: Thermal and oxygen barrier properties

“…The incorporation of higher levels of diamide units (19–20%) results in copolymers with drastically reduced crystallinities, even though PET‐I m I (20%) supercools 2 °C less than PET. The high supercooling value for PET‐T p T (3%) is in contrast to an earlier report that PET with 2% of the same diamide unit has a supercooling value that is 10 °C below that of PET 20–22…”

“…This approach amounts to a standard polyesterification in which the monomer contains two preformed amides. Bisester diamides have been used to prepare alternating poly(ester amide)s13–17 as well as polyester‐type materials with small amounts of randomly distributed diamide units 18–23…”

“…Upon incorporation into PET, the resulting diamide unit is isosteric with the PET repeat unit, and this allows the diamides to fit into the PET lattice. The incorporation of N,N ′‐bis[4‐(methoxycarbonyl)phenylcarboxy]‐1,4‐phenylenediamine (TΦT), an aromatic bisester diamide that has a poorer fit with the repeat unit of PET, also increases the rate of crystallization, but not as much as T2T 20–22…”

Alternating polyesteramides based on 1,4-butylene terephthalamide: 2. Alternating polyesteramides based on a single, linear diol (4NTm)

“…According to Della Fortuna et al 22, the molecular weight obtained by melt polymerization depends on the configuration of the reactor. We have synthesized some of the PEAs in two small reactor types, viz.…”