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Subcritical gas‐assisted processing of ethylene vinyl alcohol + nanoclay composites
Polymer Composites ( IF 5.2 ) Pub Date : 2019-12-28 , DOI: 10.1002/pc.25480
Thomas Ellingham 1, 2 , Galip Yilmaz 1, 2 , Lukas Duddleston 1 , Zhutong Li 2 , Lih‐Sheng Turng 1, 2
Affiliation  

Ethylene vinyl alcohol (EVOH) was melt compounded with an organomodified nanoclay (NC) at a loading level of 5% by weight in a twin‐screw extruder using a subcritical gas‐assisted process (SGAP). Carbon dioxide and nitrogen were used as blowing agents to induce foaming inside of the barrel of the extruder and as the melt exits the die. Samples processed with SGAP demonstrated better dispersion of NC vs the traditional extrusion process due to the additional stresses that bubble expansion provides during foaming. The dispersion was assessed by dynamic rheology, wide‐angle X‐ray diffraction, scanning electron microscopy, and microcomputed tomography. Additionally, it was found that the inert gasses used in SGAP prevented some of the thermo‐oxidative degradation EVOH experienced during processing, as evidenced by thermogravimetric analysis and Fourier transform infrared spectroscopy.

中文翻译:

亚临界气体辅助处理乙烯乙烯醇+纳米粘土复合材料

使用亚临界气体辅助工艺(SGAP)在双螺杆挤出机中将乙烯-乙烯醇(EVOH)与有机改性的纳米粘土(NC)以重量计5%的含量熔融混合。二氧化碳和氮气用作发泡剂,以在挤出机机筒内部以及熔体离开模头时引起泡沫。与起泡工艺相比,用SGAP处理的样品表现出更好的NC分散性,这是由于发泡过程中气泡膨胀会产生额外的应力。通过动态流变学,广角X射线衍射,扫描电子显微镜和计算机断层扫描对分散度进行评估。此外,还发现SGAP中使用的惰性气体可防止加工过程中遇到的一些热氧化降解EVOH,
更新日期:2019-12-28
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