Synthesis and characterization of the novel nylon 12 6 based on 1,12‐diaminododecane

Abstract

Successful polymerization of nylon 12 6 was accomplished in two-steps, the preparation of nylon salts and involvement of the salts with a pressure vessel followed by high temperature melt polymerization. Chemical composition, thermal properties, crystal structure, mechanical properties, and moisture absorption were characterized in detail. Melting temperature and glass transition temperature were recorded at 2348C and 758C, respectively, while the b-relaxation peak was determined to be 2648C. The results indicated that nylon 12 6 could be used at a broad range of temperatures. Characterization of the mechanical properties showed that nylon 12 6 exhibited a better flexibility and elongation compared with other industrially important nylons. The moisture absorption of nylon 12 6 decreased by 36.7% compared with that of nylon 6 12, suggesting that nylon 12 6 will exhibit a better dimensional stability in the humid environment. Overall, in this research, the novel nylon, that is, the nylon 12 6, shows a relatively low water absorption and excellent toughness contributing to its potential technological application in the future. POLYM. ENG. SCI., 00:000-000,

New Aspects on the Direct Solid State Polycondensation (DSSP) of Aliphatic Nylon Salts: The Case of Hexamethylene Diammonium Dodecanoate

“…Finally, at 212-217 • C a sharp endotherm corresponds to the melting of the polyamide. This behavior has been published already and is common for long chain aliphatic polyamides [25,[46][47][48][49].…”

“…In all runs the formation of a polyamide structure was confirmed through FT-IR analysis ( Figure 1 ). More specifically, all spectra included the absorptions at approximately 3300 cm −1 (hydrogen-bonded–NH stretching vibration–Amide Band I), at approximately 3062 cm −1 (Amide B overtone of Amide II), at 1640 cm −1 (–C–CO stretching vibration–Amide Band I), at 1540 cm −1 (–CN stretching vibration and CONH bend–Amide Band II), at 940 cm −1 (–C=O stretching vibration–Amide Band IV), at 690 cm −1 (–NH out of plane bend) and at 586 cm −1 (–CO out of plane bend) [ 25 , 45 , 46 , 47 , 48 ].…”

Structure and morphology of thermoplastic polyamide 6 elastomers with different soft segment content and their foaming behavior using supercriticalCO2

“…In addition to the flexibility of the PEG soft segment itself, it was maybe attributed to the reduction of the crystallinity of polyamide hard segment due to the restriction of PEG soft segment. [ 32 ] Furthermore, with the increase of molecular weight of soft segment, the tensile strength decreased gradually, and the change of elongation‐at‐break was opposite. The tensile strength of TPAE‐1, TPAE‐2, and TPAE‐3 were 44.72 ± 4.36 MPa, 35.50 ± 3.54 MPa, and 22.19 ± 3.19 MPa, respectively, and the elongation‐at‐break were (245.29 ± 20.61)%, (316.05 ± 20.58)%, and (342.90 ± 13.58)%, respectively.…”

“…In addition to the flexibility of the PEG soft segment itself, it was maybe attributed to the reduction of the crystallinity of polyamide hard segment due to the restriction of PEG soft segment. [32] Furthermore, with the increase of molecular weight of soft segment, the tensile strength decreased gradually, and the change of elongation-atbreak was opposite. The tensile strength of TPAE-…”

Nylon—A material introduction and overview for biomedical applications

“…Nylon 12 has longer aliphatic chains than the other PAs (Table 1). Although nylon 12 has lower mechanical strength and melting point than nylon 6 and nylon 66, it shows high‐pressure resistance, high impact resistance, high flexibility, low density, and good mechanical resistance 35–40 . Therefore, nylon 12 has been used in many industrial fields.…”