Crystallization studies on a clay nanocomposite prepared from a degradable poly(ester amide) constituted by glycolic acid and 6‐aminohexanoic acid

Abstract

An intercalated nanocomposite was prepared from an organomodified clay (Cloisite 25A) and a new biodegradable poly(ester amide) characterized by an alternating arrangement of glycolic acid and 6-aminohexanoic acid units by the melt-mixing technique. The influence of the final silicate layer morphology on hot and cold crystallization behavior was investigated by optical microscopy, differential scanning calorimetry, and synchrotron radiation. Primary nucleation increased significantly with the incorporation of nanoparticles, in contrast with the decrease previously observed when exfoliated structures were obtained. The secondary nucleation constant was higher for the nanocomposite sample, indicating that the growth mechanism was hampered by the presence of clay particles. However, the increase in primary nucleation had a greater effect, resulting in a faster overall crystallization rate for the nanocomposite. The addition of clay particles slightly reduced the degree of crystallinity attained after the hot and cold crystallization processes and favored a lamellar insertion mechanism.

Crystallization Behavior of Reactive Blends between PBS and PA6IcoT

“…Similar works were reported by Lips et al 8,9 They prepared segmented PEAs by melt polycondensation of dimethyl adipate, 1,4-butanediol, and a symmetrical bisamidediol based on 3-caprolactone and 1,2-diaminoethane or 1,4diaminobutane. Morales-Gamezan et al 10,11 obtained intercalated nanocomposites from an organomodified clay and PEAs characterized by an alternating arrangement of glycolic acid and 6-aminohexanoic acid units by the melt-mixing technique, nd analyzed the effects of nanoclay on the crystallization kinetics. Celli et al 12 studied the relationships between stereochemistry and crystallization behavior of poly(butylene 1,4-cyclohexanedicarboxylate), which consists of aliphatic polyesters with aliphatic rizzngs along the chains.…”

Poly(ester amide) nanocomposites by in situ polymerization: Kinetic studies on polycondensation and crystallization

“…Nanocomposites prepared by the above in situ polymerization and the melt mixing technique gave rise to two different structures (i.e. exfoliated and intercalated) that clearly influenced the crystallization kinetics [27,28]. The main purpose of the present work is to determine the effect of montmorillonites based on two different surfactants (Closites 30B and 20A) on in situ polymerization and to study the crystallization kinetics of the derived nanocomposites.…”