Nicotinamide‐based poly(ether amide)s: a novel type of soluble thermally stable polyamides

Abstract

In order to obtain a novel type of thermally stable polyamides with enhanced solubility, design and synthesis of a diamine were achieved. A nicotinamide-based dichloro compound was obtained via nucleophilic substitution reaction of 2,6-diaminopyridine with 6-chloronicotinoyl chloride. The final diamine was attained through reaction of dichloro product with 5-amino-1-hydroxynaphthalene. The obtained materials were completely characterized by common spectroscopic methods and elemental analysis. Polycondensation reaction of the diamine with different diacid chlorides led to the preparation of related nicotinamide-based poly(ether amide)s. Polymers were well characterized, and their physical and thermal properties including viscosity, solubility, thermal behavior and stability, flame retardancy, and crystallinity were studied. The polymers showed high thermal stability and flame retardancy together with enhanced solubility.

In Situ Surface Modification of Thin-Film Composite Polyamide Membrane with Zwitterions for Enhanced Chlorine Resistance and Transport Properties

“…Fabrication of the chlorine-resistant TFC polyamide membrane with superior transport properties is very important through the selection of cost-effective compounds and facile approaches for polyamide modification. 2,6-Diaminopyridine (DAP) is a cheap and common small molecule as a pyridine derivative containing amine groups and a pyridine ring, which had been used for an antioxidant or antimicrobial agent, a nitrogen-rich oxygen reduction electrocatalyst, and soluble and thermally stable polyamide material. − DAP is very reactive with acyl chloride and can be grafted on nascent polyamide by our reported layer-by-layer interfacial polymerization (LBL-IP) method . Importantly, the unreacted amine groups of DAP may act as sacrificial groups to react with chlorine, and the pyridine ring of DAP can be easily quaternized to form zwitterions having the steric and electronic-drawing effects of pyridine and quaternary ammonium groups on the polyamide layer for the prevention of Orton rearrangement.…”

Preparation and characterization of a new class of poly(ether‐block‐amide)s via solvent free reactive processing

“…Polyamide‐based block copolymers have attracted considerable attentions in the last decades because of their outstanding performance and a wide range of applications . Polyamide‐based block copolymers usually consist of polyamide as hard segments and polyether or polyester as soft segment . According to the practical application, polyamide‐6 (PA6), polyamide‐12, polyamide‐66, polyamide‐610, and other polyamides can be selected as the hard segments in the polyamide‐based block copolymer .…”

“…[1][2][3][4] Polyamide-based block copolymers usually consist of polyamide as hard segments and polyether or polyester as soft segment. [5][6][7][8][9][10] According to the practical application, polyamide-6 (PA6), polyamide-12, polyamide-66, polyamide-610, and other polyamides can be selected as the hard segments in the polyamidebased block copolymer. 4,11,12 Compared with other hard segments in the block copolymer, polyamide hard segments possess stronger hydrogen bonding and intermolecular forces, which will impart the block copolymer high melting temperature (T m ), organic solvent resistance, thermal resistance, abrasive resistance, etc.…”