Electron beam irradiation influencing the mechanical properties and water absorption of polycaprolactam (PA6) and polyhexamethylene adipamide (PA66)

Abstract

It is known that polycaprolactam (PA6) and polyhexamethylene adipamide (PA66) are widely used industrial materials including in the irradiation industry.

Synergistic effect of polyurethane‐coated carbon fiber and electron beam irradiation on the thermal/mechanical properties and long‐term durability of polyamide‐based thermoplastic composites

“…[29][30][31] Neat PA and its composites with different CNF loadings show the characteristic vibrational bands of PA chains at 3400-3200, 2900-2800, $1720, $1633, $1535, $1420, $1264, and $1107 cm À1 , which are associated with N-H stretching (ν N-H ), CH 2 stretching (ν C-H ), C=O stretching (ν C=O ), C=O stretching/C-N stretching (ν C=O /ν C-N ) of amide I bond, C-N stretching/N-H bending (ν C-N /δ N-H ) of amide II bond, N-H bending/C-C stretching/C=O bending (δ N-H /ν C-C /δ C=O ) of amide III bond, C-N stretching (ν C-N ), and CH 2 bending (δ CH2 ), respectively. [9,[32][33][34] On the other hand, it is noteworthy that several characteristic bands were found to shift to lower wavenumbers with increasing the CF content in the composites, as can be seen in Figure 3. For instance, the N-H stretching (ν N-H ) band shifted from 3296.2 cm À1 of neat PA to 3292.0 cm À1 for the composite with 10 wt% CF loading (PA/CF10-0).…”

“…[5][6][7] Polyamide 6 (PA) is one of the largest engineering thermoplastics that are tough, strong, abrasion-resistant, thermally stable, weather-resistant, and easily processible. [8,9] Accordingly, it has found major usages in technical applications such as automobiles, electronics, textiles, and packaging. Despite the superior properties of PA, the low melt strength and dimensional stability at elevated temperatures limit its utilization in specific applications.…”

“…The EB irradiation can create free radicals that lead to branching of the chains until a three-dimensional network is formed by linking each polymer chain to other chains, but it can also lead to the degradation of polymer chains. [8,9] There have been reports on the modification of PA by EB irradiation-induced crosslinking. [10] In addition, several studies have reported the effect of crosslinking agents such as triallyl cyanurate (TAC), triallyl isocyanurate (TAIC), and other multi-functional monomers for an effective crosslinking process.…”

Synthesis, characterization and crystallization kinetics of a bio-based, heat-resistance nylon 5T/10T

“…1 Aliphatic polycaprolactam (nylon 6) and polyhexamethylene adipamide (nylon 66) have been widely used in textile and electronic elds. [2][3][4] However, with the development of surface-mount technology (SMT) ($270 °C), and the high requirements of automobile parts on the heat resistance of materials, its performance has been difficult to meet the market demand. 2,5 Wholly aromatic nylons have better heat resistance, but its melting temperature is far higher than its initial thermal decomposition temperature, which cannot be processed by melting and injection molding.…”

Study on the thermal and mechanical properties of two‐dimensional d‐Ti3C2Tx filled polyamide 66 nanocomposite

“…Polyamide 66 (PA66) is a common thermoplastic that is widely used in machinery, electrical and electronic, textile, automotive, and other fields 1–5 . However, with the rapid development of industry, it is difficult for pure PA66 to meet the performance requirements under harsh working conditions.…”