Abstract
We report the synthesis of new polyamides containing 2,6-bis(2-thio-2-(4-carboxyphenyl)-1-oxo)pyridine subunit, under microwave irradiation using Yamasaki phosphorylation method. The solubility, thermal behavior, and viscosity of polyamides were evaluated. The structures of polymers have been characterized using IR and 1H NMR spectroscopy. These polyamides showed good solubility, viscosity, high thermal stability, and glass transition temperatures. Their viscosities and glass transition temperatures are in the range of 0.63–0.88 and 223–295°C, respectively. Thermal stabilities for 10% weight loss (T10) are 137–173°C and for 50% weight loss (T50) are in the range of 483–523°C. The study of surface morphology showed particle and amorphous structures.
Highlights
Aromatic polyamides explore high thermal stability, good chemical resistance, excellent mechanical properties, and a series of reliable properties that have broad applications in many areas of research and engineering [1,2,3,4]
Since the first published reports on the use of microwave irradiation to improve chemical transformations by Gedye et al in 1986 [19], a large number of research papers have been published in this active field, referred to as microwaveassisted organic synthesis (MAOS) [20, 21]
We wish to report the synthesis and characterization of polyamides, which were obtained from the reaction of a new monomer (5, PDA), containing 2,6-bis(2-thio-2-(4-phenylcarboxy)-1-oxo)pyridine subunit, and aromatic diamines under microwave irradiation
Summary
Aromatic polyamides (aramides) explore high thermal stability, good chemical resistance, excellent mechanical properties, and a series of reliable properties that have broad applications in many areas of research and engineering [1,2,3,4] All of these polymers have the main problem of being difficult to process and of fabrication because of their infusibility and poor solubility in common organic solvents. Microwave heating compared to conventional heating procedures indicated that it could reduce reaction times, increase product yields, and enhance product purities by reducing byproducts The advantages of this efficient technology have been explored in the context of multistep total synthesis [22], medicinal chemistry, and drug discovery [23]. Surface morphology of these polymers was studied using scanning electron microscopy (SEM)
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