High Performance Polyamides based on s-Triazine Ring: Synthesis and Characterization

Abstract

High-performance polymers based on aromatic rings are desirable not only because of the high primary bond strengths, but also because their rigid (stiff) polymer chains offer increased resistance to deformation and thermal softening. The choice of s-triazine nucleus is based on its high thermal stability derived from its molecular symmetry and aromaticity. It is well known that s-triazine is heat resistant. Modification of monomer structures by introduction of aromatic pendent groups or heterocyclic rings into the polymer backbone provides good solubility and thermal stability. A new set of polyamides with —CO—NH— groups were synthesized by the Yamazaki’s phosphorylation reaction 2-(morpholino)-4,6-bis (6-napthoxy-2-carboxy)-s-triazine with various aromatic diamines. The polyamides had inherent viscosities in the range 0.549—0.685 dL g-1 in dimethylformamide at room temperature (30 °C) and density 1.135—1.208 g cm - 3 . All the polyamides showed good thermal stability and most of them were readily soluble at room temperature in polar solvents such as N,N-dimethylacetamide, 1-methyl-2-pyrrolidone and dimethylformamide. Polyamides were synthesized successfully with the favourable properties of higher thermal stability along-with good processibility.

Efficient removal of hexavalent chromium and lead from aqueous solutions by s‐triazine containing nanoporous polyamide

“…Among to the high‐performance PAs, s‐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. Because of their outstanding comprehensive properties, they can be potently utilized as structural adhesives or matrices in advanced composites for structural applications, especially for high‐speed aircraft and missiles …”

SYNTHESIS, CHARACTERIZATION AND PHYSICO-CHEMICAL PROPERTIES OF COPOLYESTERS ONTAINING s-TRIAZINE RING IN THE MAIN CHAIN.

“…Recently most researchers working for the synthesis of high-performance polymers with high thermal stability and heat resistance with good mechanical properties, as they are required to use as engineering plastic materials. Now a day the copolyesters are largely used in various fields to achieve high thermal stability and good mechanicals property [5][6][7][8]. Polymers containing s-triazine ring in the main chain have excellent heat resistance and several are commercially available as high-performance engineering plastic materials.…”

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

“…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 .…”