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首页> 美国卫生研究院文献>Polymers >Improving the Continuous Microcellular Extrusion Foaming Ability with Supercritical CO2 of Thermoplastic Polyether Ester Elastomer through In-Situ Fibrillation of Polytetrafluoroethylene
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Improving the Continuous Microcellular Extrusion Foaming Ability with Supercritical CO2 of Thermoplastic Polyether Ester Elastomer through In-Situ Fibrillation of Polytetrafluoroethylene

机译：通过聚四氟乙烯原纤化提高热塑性聚醚酯弹性体的超临界CO2连续微孔挤出发泡能力

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摘要

In-situ fibrillated polytetrafluoroethylene (PTFE) enhanced nanocomposites were successfully prepared by mixing thermoplastic polyether ester elastomer (TPEE) and PTFE using a twin-screw extruder. Well-dispersed, long aspect ratio PTFE nanofibrils with a diameter of less than 200 nm were generated and interwoven into networks. Differential scanning calorimetry and in-situ polarized optical microscopy showed that the PTFE nanofibrils can greatly accelerate and promote crystallization of the TPEE matrix and the crystallization temperature can be increased by 6 °C. Both shearing and elongational rheometry results confirmed that the introduction of PTFE nanofibrils can significantly improve the rheological properties. The remarkable changes in the strain-hardening effect and the melt viscoelastic response, as well as the promoted crystallization, led to substantially improved foaming behavior in the continuous extrusion process using supercritical CO as the blowing agent. The existing PTFE nanofibrils dramatically decreased the cell diameter and increased cell density, together with a higher expansion ratio and more uniform cell structure. The sample with 5% PTFE fibrils showed the best foaming ability, with an average diameter of 10.4–14.7 μm, an expansion ratio of 9.5–12.3 and a cell density of 6.6 × 10 –8.6 × 10 cells/cm .
机译：通过使用双螺杆挤出机将热塑性聚醚酯弹性体（TPEE）和PTFE混合，成功地制备了原纤化的聚四氟乙烯（PTFE）增强纳米复合材料。产生了直径小于200 nm的分散良好的长径比PTFE纳米原纤维，并将其交织成网络。差示扫描量热法和原位偏振光学显微镜表明，PTFE纳米原纤维可以极大地促进和促进TPEE基质的结晶，结晶温度可以提高6°C。剪切流变学和伸长流变学结果均证实，引入PTFE纳米原纤维可以显着改善流变性能。应变硬化效应和熔体粘弹性响应的显着变化，以及促进的结晶，在使用超临界CO作为发泡剂的连续挤出过程中，导致了发泡性能的显着改善。现有的PTFE纳米原纤维显着减小了泡孔直径并增加了泡孔密度，同时具有更高的膨胀比和更均匀的泡孔结构。具有5％PTFE原纤维的样品表现出最佳的发泡能力，平均直径为10.4–14.7μm，膨胀比为9.5–12.3，孔密度为6.6×10 –8.6×10孔/厘米。

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