Synthesis and Characterization of New Poly(amide-imide)/organoclay Nanocomposites Derived from N,N′-(4,4′-diphtaloyl)-bis-L-α-aminophenyl Acetic Diacid and 1,2-Bis(4-aminophenoxy)ethane

摘要

In this study, a series of polymer/clay nanocomposites (PCNs) materials consisting of organic poly(amide-imide) (PAI) and organo-modified clay content varying from 0 to 10 mass%, were successfully prepared by solution dispersion technique. At first, the reactive organoclay was prepared by using protonated L-phenylalanine amino acid as a swelling agent for silicate layers of montmorillonite/Na~(+)(MMT/Na~(+)) via ion-exchange reaction. Then, poly(amide-imide) used as a matrix of nanocomposite was prepared through the polymerization reaction of N,N′-(4,4′-diphtaloyl)-bis-L-α-aminophenyl acetic diacid and 1,2-bis(4-aminophenoxy)ethane in a medium of N-methyl-2-pyrrolidone (NMP) / triphenyl phosphite (TPP) / calcium chloride (CaCl_(2)) / pyridine (py). This polymer was end-capped with amine end groups near the completion of the reaction to interact chemically with organoclay. Finally, PAI/organoclay nanocomposite films containing 1%, 3%, 5% and 10% of organoclay were prepared via solution intercalation method through blending of organoclay with the PAI solution. The resulting nanocomposite films were characterized by FT-IR spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and thermogravimetric analysis (TGA). XRD and TEM results revealed the formation of exfoliated and intercalated organoclay platelets in the PAI matrix. TGA results indicated that the addition of organoclay into the PAI matrix increases in the thermal decomposition temperatures of the resulted nanocomposites.