Effect of ionization of polyamide-66 on its heterogeneous nucleation of poly(ethylene terephthalate) crystallization: An efficient polyamide-66 ionene nucleator promoted by ion‒dipole interactions

Mechanical and Gas Barrier Properties of Structurally Enhanced Poly(ethylene terephthalate) by Introducing 1,6-Hexylenediamine Unit

“…Luo and co-workers prepared the PA66 ionene to blend with PET and found that the PET/PA66 interfacial compatibility improved thanks to the enhanced interfacial adhesion of two polymers. 9 The PET/ PA66 ionene blends exhibited good thermal properties and high degree of crystallinity. To some extent, particle coalescence under shear stress is hard to avoid owing to insufficient cohesion between different phases.…”

“…As displayed in Figure 7a, 2θ and hkl values of two prepared samples were consistent with that of virgin PET. 9 This manifested that the crystal structure of p-ETA samples essentially remained constant with virgin PET in a triclinic crystal system with a near planar chain conformation. Moreover, the interplanar spacing (d hkl ) values of virgin PET and p-ETA were similar to each other as shown in Table S1, indicating that the unit-cell parameters of the triclinic crystal lattice of PET were not changed by the incorporation of amide-bond units.…”

“…7,8 However, low crystallization velocity and poor toughness caused by the inherent structural repeat units of PET dramatically decrease the performances and lifetime of products and represent a major roadblock for applications. 9,10 Although the gas barrier properties of PET are excellent compared to that of other polymers, further improvement of gas barrier properties will expand the application of PET as packaging materials. 11,12 A lot of effort has been made for improving the properties of PET with polyamides (PAs) as reinforcing materials for their excellent fatigue resistance and gas barrier.…”

“…Observation of the crystallization process was carried out as reported previously. 9 Polarized optical microscopy (POM) images of samples were taken at different temperatures during the cooling process from 270 to 150 °C with a cooling rate of 10 °C/min. The wide-angle X-ray diffraction (WAXD) patterns of the virgin PET and p-ETA samples were recorded by the AXS-D8 ADVANCE X-ray diffractometer (Bruker, Germany) with Cu Kα radiation in the scan range from 5 to 60°at 2°min −1 .…”

“…Poly­(ethylene terephthalate) (PET) is used in a wide range of applications, such as membrane technology, optical films, textile plastics, , and packaging materials , because of its low cost, good optical transparency, chemical inertness, and so forth. , However, low crystallization velocity and poor toughness caused by the inherent structural repeat units of PET dramatically decrease the performances and lifetime of products and represent a major roadblock for applications. , Although the gas barrier properties of PET are excellent compared to that of other polymers, further improvement of gas barrier properties will expand the application of PET as packaging materials. , …”