Influences of the Crystallization Behavior of n-HA Reinforced PA66 Biocomposite on Its Mechanical Properties

Abstract

The crystallization behavior of n-HA/PA66 biocomposites at different processing pressure and annealing temperature were investigated by XRD and DSC. The results showed that increasing annealing temperature would weaken the crystalline intensities of pure PA66 and its composites. For n-HA/PA66 composites, the peaks of α1 crystals of PA66 disappeared, only α2 crystals existed, and with the increase of injection pressure and annealing temperature, the crystalline intensity of PA66 decreased. The degree of crystallinity (Xc) of PA66 in composites increased with the increase of injection pressure, however, annealing temperature had no obvious effects on crystalline degree. The mechanical properties had close relationship with the crystallization behavior of the materials.

In Situ Polymerization of Antibacterial Modification Polyamide 66 with Au@Cu2O-ZnO Ternary Heterojunction

“…In Figure 8 , two characteristic diffraction peaks, (100) and (010,110) of α phase crystals, can be observed for pure PA66, PA66/Au@Cu 2 O-ZnO-400, PA66/Au@Cu 2 O-ZnO-800, and PA66/Au@Cu 2 O-ZnO-1200 at 2θ angles of 20.8° and 23.8°, 20.7° and 23.9°, 20.5° and 23.7°, and 20.5° and 23.8°, respectively [ 38 ]. With increased heterojunction loading, these peaks shifted to lower angles.…”

“…However, excessive Au@Cu2O-ZnO nanoparticles can impede molecular chain movement. In Figure 8, two characteristic diffraction peaks, (100) and (010,110) of α phase crystals, can be observed for pure PA66, PA66/Au@Cu2O-ZnO-400, PA66/Au@Cu2O-ZnO-800, and PA66/Au@Cu2O-ZnO-1200 at 2θ angles of 20.8° and 23.8°, 20.7° and 23.9°, 20.5° and In Figure 8, two characteristic diffraction peaks, (100) and (010,110) of α phase crystals, can be observed for pure PA66, PA66/Au@Cu 2 O-ZnO-400, PA66/Au@Cu 2 O-ZnO-800, and PA66/Au@Cu 2 O-ZnO-1200 at 2θ angles of 20.8 • and 23.8 • , 20.7 • and 23.9 • , 20.5 • and 23.7 • , and 20.5 • and 23.8 • , respectively [38]. With increased heterojunction loading, these peaks shifted to lower angles.…”

“…Polymers 2024, 16, x FOR PEER REVIEW 9 of 14 23.7°, and 20.5° and 23.8°, respectively [38]. With increased heterojunction loading, these peaks shifted to lower angles.…”

A Novel Strategy for Fabrication of Polyamide 66/Nanohydroxyapatite Composite Bone Repair Scaffolds by Low-Temperature Three-Dimensional Printing

“…XRD analysis indicated that as the HAp content increased, the characteristic peaks of HAp became more pronounced, while the crystalline peak intensity of polyamide diminished and eventually vanished (Figure B). This may be due to the formation of hydrogen bonds between HAp and PA66, interfered with the arrangement of the PA66 molecular chains and altered the crystallization behavior of PA. , The crystal peaks of HAp within the composite scaffolds remained unchanged, implying that the fabrication process did not alter the crystal structures of the inorganic components.…”

High-efficiency absorption and acoustoelectric conversion in heterogeneous nanofibers: a two-pronged approach to full-frequency de-noising

“…28,29 There is a widely held belief that methylene groups in macromolecular chains display a high degree of flexibility, while benzene rings exhibit rigidity. This theory is exemplified by materials such as PA66, 30,31 with low modulus, and PS, with high modulus. These polymers can be utilized to fabricate multi-frequency acoustic absorbers.…”