Phosphonated Poly(ethylene terephthalate) ionomers as compatibilizers in extruded Poly(ethylene terephthalate)/Poly(m-xylylene adipamide) blends and oriented films
Phosphonated Poly(ethylene terephthalate) ionomers as compatibilizers in extruded Poly(ethylene terephthalate)/Poly(m-xylylene adipamide) blends and oriented films
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DOI：
10.1016/j.polymer.2020.122891
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发表时间：
2020-09-28
期刊：
影响因子：
4.6
通讯作者：
Moore, Robert B.
中科院分区：
文献类型：
--
作者：
Ju, Lin;Mondschein, Ryan J.;Moore, Robert B.
采用Na+型磷酸化PET离聚物（Na+-PPET）作为相容剂，成功地增容了聚对苯二甲酸乙二醇酯（PET）和聚己二酰间苯二甲胺（MXD 6）共混物。通过在双螺杆挤出机中熔融混合来制备含有不同量的膦酸化聚酯的增容的90：10（按重量计）聚酯/聚酰胺共混物。扫描电子显微镜（SEM）显示，挤出的共混物含有分散在PET基体中的球形MXD 6域。相分离的MXD 6域的大小随着离子单体浓度的增加而减小，并且有效的增容作用归因于Na+-PPET离聚物上的离子膦酸酯基团与MXD 6的酰胺键之间的特定相互作用。热分析表明，小的MXD 6域成核PET的结晶冷却后，如由PET的结晶温度向更高的温度的偏移所指示的。此外，特异性相互作用似乎抑制MXD 6的结晶。具有3 X 3的拉伸比的共混物的熔融加工膜的双轴取向将球形MXD 6域转化成在膜的平面中取向的高纵横比片晶。与不相容的基础共混物相比，取向膜的光学性能表征显示出降低的雾度为56%，并且在聚酯组分中掺入0.22摩尔%的膦酸化离子单体的情况下，透明度提高了35%。此外，发现含有0.11摩尔%膦酸化单体的定向Na+-PPET/PET/MXD 6共混物组合物的透氧性降低33%。
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 x 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.