Synthesis and characterization of polyamides containing s‐triazine rings in the main chain

Abstract

Polyamides were synthesized from diacids containing a s‐triazine ring and two aromatic diamines, namely 4,4′‐diaminodiphenyl ether (ODA) and 4,4′‐diaminodiphenylmethane (MDA), by direct polycondensation using the phosphorylation reaction. Polymers thus obtained were characterized by viscosity measurement, IR spectroscopy, thermogravimetry, X‐ray diffraction, and solubility tests. These polyamides had inherent viscosities in the range of 0.51–0.77 dL/g, and were amorphous in nature. All the polymers were readily soluble in various organic solvents and did not lose weight below 270°C in air.

New heat resistant nanocomposites reinforced silicate nanolayers containing triazine rings based on polyamide: Synthesis, characterization, and flame retardancy study

“…MTBA based on triazine ring as a heterocyclic unit was synthesized according to the reported procedure . In order to synthesis of thermally stable polyamide, MTBA was synthesized from one mole 6‐methoxy‐2,4‐dichlorotriazine and two moles of 4‐aminobenzoic acid in a solution of sodium bicarbonate (Scheme ).…”

“…MTDA was synthesized by using two‐step reactions. At first, 6‐methoxy‐N 2 ,N 4 ‐bis(4‐nitrophenyl)−1,3,5‐triazine‐2,4‐diamine (MNTDA) was prepared from the reaction of two moles 4‐nitroaniline and one mole of 6‐methoxy‐2,4‐dichlorotriazine according to the reported procedure . Then MNTDA was reduced by using Pd/C in presence of hydrazine and ethanol under reflux condition (Scheme ).…”

“…Cyanuric chloride (Merck) recrystallized in hot carbon tetrachloride. 2,4‐dichloro‐6‐methoxytriazine was synthesized according to the previous literatures , 4‐nitro aniline, 4‐aminobenzoic acid, 4,4′‐diaminodiphenylether (Merck) were used without further purification. Solvent: N ‐methyl‐2‐pyrrolidone (NMP; Fluka), pyridine (Acros), triphenyl phosphite (TPP; Merck), and N,N ‐dimethylformamide (DMF; Merck) were used as received.…”

“…Most frequently, much effort has been paid to the development of aromatic heterocyclic polymers for use as advanced composite matrix, structural adhesives or coatings in high‐temperature applications . Among this category of polymers, triazine‐containing polymers are drawing much attention for their more excellent thermal resistance, higher tensile strengths, and modulus at elevated temperatures, relative to the conventional polymers .…”

Synthesis and Characterization of Polyamides Based on s-Triazine Moiety

“…It is known that polyamides containing s-triazine as a heterocyclic unit in the main chain exhibit excellent thermal stability with improved solubility [18][19]. There are many reports leading to synthesis of polyamides containing s-triazine rings in the main chain [20][21][22][23].…”