The methodology for improving the properties and foaming behavior of poly (ethylene terephthalate) (PET)/poly(ethylene-octene) (POE) blends through compatibilization was proposed. In this paper, PET/POE blends were prepared through a melt blending method, POE was employed as elastomer toughener, maleic anhydride grafted POE (mPOE) was selected as compatibilizer, and pyromellitic dianhydride (PMDA) was used as chain extender. The content of mPOE was changeable to study the effect of compatibility on crystallization behavior, toughness, dispersion morphology, and rheological behavior of PET/ POE blends. The results demonstrated that the crystallization peak of PET/POE blends shifted towards high temperatures from 196.97°C to 201.24°C with the content of mPOE increasing. The brittle-ductile transition for PET/POE blends occurred at the mPOE content in the range of 4–5 phr. The particle size of POE dispersed phase decline firstly and then was almost unchanged with an increasing content of mPOE. The storage modulus and complex viscosity of compatibilized PET/POE blends were obviously higher than that of uncompatibilized PET/POE blends. Then PET/POE blends were foamed using supercritical CO2 as physical blowing agent. The results showed that the cell size, cell density, and tensile properties of the PET/POE blending foams were affected by the content of mPOE strongly. With the content of mPOE, the cell size decreased and then kept stable as well as the cell density the trend of cell size increased then remained unchanged. In addition, the elongation at break of PET/POE blending foams was higher than that of the uncompatibilized PET/POE blending foam. PET/POE blending foams with fine cell morphology and good ductility could be achieved with a proper content of compatibilizer in the blends.

中文翻译：

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增容对聚（对苯二甲酸乙二醇酯）/聚（乙烯-辛烯）共混物的性能和发泡行为的影响

提出了通过增容改善聚（对苯二甲酸乙二醇酯）（PET）/聚（乙烯-辛烯）（POE）共混物的性能和发泡行为的方法。本文采用熔融共混法制备了PET/POE共混物，采用POE作为弹性体增韧剂，选择马来酸酐接枝POE（mPOE）作为增容剂，均苯四酸二酐（PMDA）作为扩链剂。mPOE 的含量是可变的，以研究相容性对 PET/POE 共混物的结晶行为、韧性、分散形态和流变行为的影响。结果表明，随着 mPOE 含量的增加，PET/POE 共混物的结晶峰从 196.97°C 向高温移动至 201.24°C。PET/POE 共混物的脆-韧转变发生在 mPOE 含量范围为 4-5 phr 时。随着mPOE含量的增加，POE分散相的粒径先下降后几乎不变。相容的 PET/POE 共混物的储能模量和复数粘度明显高于未相容的 PET/POE 共混物。然后使用超临界 CO2 作为物理发泡剂发泡 PET/POE 共混物。结果表明，PET/POE共混泡沫的泡孔尺寸、泡孔密度和拉伸性能受mPOE含量的影响很大。随着mPOE含量的增加，细胞体积减小后趋于稳定，细胞密度呈增大后趋于稳定的趋势。此外，PET/POE 共混泡沫的断裂伸长率高于不相容的 PET/POE 共混泡沫。PET/POE 共混泡沫具有良好的泡孔形态和良好的延展性，可在共混物中加入适当的增容剂。