Polymeric amides from epsilon‐caprolactam

Abstract

Abstractε‐Caprolactam is converted to ε‐aminocaproic acid polymer by heating under pressure with water followed, by distillation of the water and heating at atmospheric pressure. The lactam is also polymerized directly to this polymer by a catalytic method in which sodiocaprolactam is the initiator.

Controlled synthesis of crosslinked polyamide 6 using a bis-monomer derived from cyclized lysine

“…The final yield of the product is 95%. 1 28.83 (s, eCH 2 CH 2 CH 2 CH(COe)NHCOe), 27.63 (s, eCH 2 CH 2 CH(NHe) COe) and 24.85 (s, eNHCOCH 2 CH 2 e).…”

“…One of the most common polyamides is the poly(ε-caprolactam) (PA6) which is also known as Nylon-6, Ultramid ® , Ertalon ® 6, Nylatron ® 6, Akulon ® Ultraflow ® , and Grilon ® . The industrial production of PA6 involves either hydrolytic [1] or anionic [2e6] ring-opening polymerization of ε-caprolactam (CL). While the hydrolytic polymerization of CL is the most important for commercial production of PA6, rapid anionic polymerization of molten CL is mainly used to develop at relatively low temperature (i.e.…”

Simulation of Powder-Based Additive Manufacturing Processes

“…1 The commercialized polymer, referred to as nylon by DuPont in 1948, was used for molding and extrusion processes; the material later became known as nylon 6 or polyamide 6 (PA6). Shortly after, the introduction of a nylon suitable for spinning and drawing to produce nylon fiber led to fast growth in its production.…”

Polymerization of ϵ‐Caprolactam to Nylon‐6 Catalyzed by Barium σ‐Borane Complex under Mild Condition

“…The properties of nylon-6 synthesized through anionic polymerization are often shaped by irregularities in the polymer chain because of side reactions such as Claisen-type condensations that occur during the polymerization of ɛ-caprolactam. [11][12][13] We report here for the first time the synthesis of barium σ-borane [a] Dr. [30] Ricco et al have studied the influence of fast activators on the chain regularity and polymorphism of synthesized nylon-6.…”

“…[1] Among all the polyamides available today, poly (ɛ-caprolactam) or nylon-6 alone represents approximately 45 % of worldwide production in terms of volume. [11][12][13][14][15][16][17][18][19][20] Buchmeiser et al reported a series of N-heterocyclic carbenes (NHCs) as initiators at temperatures of 180-200°C for anionic ring-opening homo as well as copolymerization of lactams to give corresponding polyamide PA 12 and PA 6/12. [3][4][5][6][7][8][9][10] The industrial production of nylon-6 is commonly carried out by means of anionic polymerization, which is performed hydrolytically at 250°C or at a relatively lower temperature of 150°C in the presence of an initiator.…”