[题名] 采用挤出工艺回收四氟乙烯-全氟烷基乙烯基醚共聚物 ( PFA )

[作者] Carlos Henrique Romoaldo, Edson Luiz Francisquetti, Douglas Alexandre Simon,Juliano Roberto Ernze, and Eveline Bischoff

[摘要] 四氟乙烯-全氟烷基乙烯基醚共聚物（PFA）的应用领域广泛，从生物医学和航空航天到化学工业中的腐蚀性环境都有涉及。尽管在报废产品中的份额较低，但PFA加工过程中产生的废料可高达30%。因此，了解再生的含氟聚合物如何影响产品性能对于确保初级回收以及出于经济和环境原因至关重要。本文研究了PFA废料（即再生PFA，PFAr）在闭环回收中的利用可行性。研究了PFAr填充量（5-100 wt.%）对热学、机械、流变学、颜色和化学耐受性等性能的影响。在所测试的所有PFAr含量范围内，热学和化学耐受性没有发生显著变化。添加较高量的PFAr（≥50 wt.%）导致机械性能下降，特别是应力-强度分析和断裂伸长率。然而，随着结晶度的增加，弹性模量和硬度也相应提高。复数粘度降低和样品黄变可能是由聚合物链降解引起的。尽管如此，高达10 wt.%的PFAr添加量证明是再生PFA残渣基于机械回收的有效替代方案。

[关键词] PFA、挤出工艺、PFA废料、机械机械性能、化学耐受性、复数粘度降低、样品黄变

[Title] Recycling Tetrafluoroethylene–Perfluoroalkyl Vinylether Copolymer (PFA) Using Extrusion Process

[Author] Carlos Henrique Romoaldo, Edson Luiz Francisquetti, Douglas Alexandre Simon,Juliano Roberto Ernze, and Eveline Bischoff

[Abstract] Tetrafluoroethylene–perfluoroalkyl vinylether copolymer (PFA) has a broad application ranging from biomedical and aerospace to corroding environments in the chemical industry. Despite a low share in end-of-life products, PFA processing can produce up to 30% of waste. Thus, understanding how recycled fluorinated polymers affect product performance is crucial to ensure primary recycling, besides economic and environmental reasons. In this paper, the utilization feasibility of PFA waste materials is investigated, i.e., recycled PFA (PFAr) in closed-loop recycling. The effect of PFAr loading (5–100 wt.%) on the thermal, mechanical, rheological, and color properties and chemical resistance are studied. Thermal properties and chemical resistance showed no significant changes in all ranges of PFAr content tested. The addition of higher loads of PFAr (≥50 wt.%) leads to a reduction in mechanical properties, particularly stress-strength analysis and elongation at break. However, elastic modulus and hardness have improved concurrently with an increase in the degree of crystallinity. The decrease in complex viscosity and yellowing of the samples occurred probably induced by a polymer chain degradation. Despite that, the addition of up to 10 wt.% of PFAr proved to be an effective alternative to reusing PFA residues based on mechanical recycling.

[Keywords] PFA、Extrusion Process、PFA waste、mechanical properties、The decrease in complex viscosity 、yellowing of the samples