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首页> 外文期刊>Journal of Applied Polymer Science >Processing-induced degradation of nanoclay organic modifier in melt-mixed PET/PE blends during twin screw extrusion at industrial scale: Effect on morphology and mechanical behavior
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Processing-induced degradation of nanoclay organic modifier in melt-mixed PET/PE blends during twin screw extrusion at industrial scale: Effect on morphology and mechanical behavior

机译：工业规模双螺杆挤出过程中熔融混合的PET / PE共混物中加工诱导的纳米粘土有机改性剂的降解：对形态和机械性能的影响

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摘要

Immiscible PET/PE blends (80/20 wt %) were prepared on an industrial twin-screw extruder with and without different types of commercially available montmorillonites (Cloisite? C15A, C10A, and 30B), containing organic surfactants differing by their polarities and their thermal stability). XRD and TEM observations evidence an intercalated structure, C15A leading to a better dispersion compared to C30B and C10A. The size of the PE dispersed phase decreases upon addition of organoclays (OMMT), suggesting an efficient compatibilization. The most efficient compatibilizing effect is observed in the case of C15A (smallest droplet size and narrowest size distribution). Nevertheless, elongation at break in tension and impact strength of PET/PE blends drastically decrease upon addition of OMMT, whatever the organoclay added, due to a possible degradation of the clay surfactant during melt compounding, which counteracts the nanofiller compatibilization effect. Furthermore, similar PET/PE/OMMT blends prepared at a lab scale using a microcompounder are ductile contrary to those compounded in the industrial extruder, which show a brittle behavior. This difference was ascribed to the extrusion residence time (much higher in an industrial extruder than in a lab micro-compounder), which appeared to be a key parameter in controlling the clay surfactant degradation and thus the end-use properties of such immiscible blends.
机译：在具有和不具有不同类型的市售蒙脱土（Cloisite？C15A，C10A和30B）的工业双螺杆挤出机上制备不混溶的PET / PE共混物（80/20 wt％），其有机极性和极性不同热稳定性）。 XRD和TEM观察结果表明，与C30B和C10A相比，C15A具有插层结构，因此分散性更好。添加有机粘土（OMMT）后，PE分散相的尺寸减小，表明有效的相容性。在C15A的情况下，观察到最有效的增容效果（最小的液滴尺寸和最窄的尺寸分布）。然而，无论加入何种有机粘土，加入OMMT后，PET / PE共混物的拉伸断裂伸长率和冲击强度都会急剧降低，这是由于在熔融混合过程中粘土表面活性剂可能降解而抵消了纳米填料的增容作用。此外，与在实验室挤出机中使用微粉碎机制备的类似PET / PE / OMMT共混物具有延展性，与在工业挤出机中混合的那些表现出脆性的相反。这种差异归因于挤出停留时间（在工业挤出机中比在实验室微型粉碎机中高得多），这似乎是控制粘土表面活性剂降解并因此控制这种不混溶共混物最终用途性能的关键参数。

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