Toward a Long-Chain Perfluoroalkyl Replacement: Water and Oil Repellency of Polyethylene Terephthalate (PET) Films Modified with Perfluoropolyether-Based Polyesters


DEMİR ÇALIŞKAN T., Wei L., Nitta N., Yushin G., Brown P. J., Luzinov I.

ACS APPLIED MATERIALS & INTERFACES, cilt.9, sa.28, ss.24318-24330, 2017 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 9 Sayı: 28
  • Basım Tarihi: 2017
  • Doi Numarası: 10.1021/acsami.7b05799
  • Dergi Adı: ACS APPLIED MATERIALS & INTERFACES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.24318-24330
  • Anahtar Kelimeler: oil repellency, water repellency, polyethylene terephthalate, perfluoropolyethers, oleophobicity, hydrophobicity, SURFACE FREE-ENERGY, MELT-BLOWN FIBERS, BLOCK-COPOLYMERS, POLY(BUTYLENE TEREPHTHALATE), POLY(VINYLIDENE FLUORIDE-CO-HEXAFLUOROACETONE), POLY(ETHYL ACRYLATE), POLYMER BLENDS, SEGREGATION, POLYSTYRENE, ADDITIVES
  • Ankara Üniversitesi Adresli: Hayır

Özet

Original perfluoropolyethers (PFPE)-based oligomeric polyesters (FOPS) of different macromolecular architecture were synthesized via polycondensation as low surface energy additives to engineering thermoplastics. The oligomers do not contain long-chain perfluoroalkyl segments, which are known to yield environmentally unsafe perfluoroalkyl carboxylic acids. To improve the compatibility of the materials with polyethylene terephthalate (PET) we introduced isophthalate segments into the polyesters and targeted the synthesis of lower molecular weight oligomeric macromolecules. The surface properties such as morphology, composition, and wettability of PET/FOP films fabricated from solution were investigated using atomic force microscopy, X-ray photoelectron spectroscopy, and contact angle measurements. It was demonstrated that FOPs, when added to PET film, readily migrate to the film surface and bring significant water and oil repellency to the thermoplastic boundary. We have established that the wettability of PET/FOP films depends on three main parameters: (i) end-groups of fluorinated polyesters, (ii) the concentration of fluorinated polyesters in the films, and (iii) equilibration via annealing. The most effective water/oil repellency FOP has two C4F9-PFPE-tails. The addition of this oligomeric polyester to PET allows (even at relatively low concentrations) reaching a level of oil repellency and surface energy comparable to that of polytetrafluorethylene (PTFE/Teflon). Therefore, the materials can be considered suitable replacements for additives containing long-chain perfluoroalkyl substances.