Blends of poly(ethylene terephthalate) (PET) and poly(m-xylylene adipamide) (MXD6) were successfully compatibilized by using a phosphonated PET ionomer in the Na⁺ form (Na⁺-PPET) as a compatibilizer. The compatibilized 90:10 (by weight) polyester/polyamide blends containing various amounts of the phosphonated polyester were prepared by melt mixing in a twin-screw extruder. Scanning electron microscopy (SEM) revealed that the extruded blends contained spherical MXD6 domains dispersed in the PET matrix. The phase-separated MXD6 domain size decreased with increasing ionic monomer concentration, and the efficient compatibilization was attributed to specific interactions between the ionic phosphonate groups on the Na⁺-PPET ionomer and the amide linkages of MXD6. Thermal analysis suggested that the small MXD6 domains nucleated the crystallization of PET upon cooling as indicated by a shift of crystallization temperature of PET to higher temperatures. Furthermore, the specific interactions appeared to inhibit crystallization of MXD6. Biaxial orientation of melt processed films of the blends with a draw ratio of 3 × 3 transformed the spherical MXD6 domains into high aspect ratio platelets that were oriented in the plane of the film. Compared to the uncompatibilized base blends, optical property characterization on the oriented films revealed a decreased haziness by 56% and an improved transparency by 35% with 0.22 mol% of phosphonated ionic monomers incorporated in the polyester component. Moreover, a 33% decrease in oxygen permeability was found for the oriented Na⁺-PPET/PET/MXD6 blend composition containing 0.11 mol% of phosphonated monomers.

聚（对苯二甲酸乙二醇酯）（PET）和聚（的共混物米-xylylene酰己二胺）（MXD6）通过使用以Na一个膦酸化PET离聚物被成功增容⁺形式（钠⁺ -PPET）作为增容剂。通过在双螺杆挤出机中熔融混合来制备含有各种量的膦酸酯化聚酯的相容的90∶10（重量比）的聚酯/聚酰胺共混物。扫描电子显微镜（SEM）显示，挤出的共混物包含分散在PET基质中的球形MXD6结构域。随着离子单体浓度的增加，相分离的MXD6结构域尺寸减小，并且有效的相容性归因于Na ⁺上离子膦酸酯基团之间的特定相互作用-PPET离聚物和MXD6的酰胺键。热分析表明，小的MXD6域在冷却时使PET的结晶成核，如PET的结晶温度向更高温度的转移所表明的。此外，特异性相互作用似乎抑制了MXD6的结晶。拉伸比为3×3的共混物熔融加工薄膜的双轴取向将球形MXD6域转变为在薄膜平面中取向的高深宽比血小板。与不相容的基础共混物相比，在取向膜上的光学性能表征显示，在聚酯组分中掺入了0.22 mol％的膦酸化离子单体，雾度降低了56％，透明度提高了35％。此外，含有0.11mol％的膦酸酯化单体的⁺ -PPET / PET / MXD6共混组合物。