Poly(ε-caprolactone-b-perfluoropolyether-b- ε-caprolactone) (PCL-PFPE-PCL) block copolymers having different PCL block lengths and end-capped with methacrylate groups were prepared and characterized. Spectroscopic analyses confirmed the expected molecular structure of the products. After UV curing, the films revealed the presence of two amorphous phases, corresponding to fluorinated and hydrogenated moieties, respectively. The material containing long PCL blocks showed also a crystalline phase. Surface properties of the UV-cured films were evaluated: The surfaces have a very high hydrophobic character in spite of the presence of many polar OH groups present in the polymeric network and a high hysteresis in wetting. An enrichment of fluorine at the air-side surface was shown by contact-angle measurements, except when long PCL sequences are present. The θadv angles decreased by increasing the content of PCL, that is, by decreasing the content of fluorine.
Bongiovanni R., Malucelli G., Messori M., Pilati F., Priola A., Tonelli C., et al. (2000). Acrylic polyester resins containing perfluoropolyethers structures: Synthesis, characterization, and photopolymerization. JOURNAL OF APPLIED POLYMER SCIENCE, 75(5), 651-659 [10.1002/(SICI)1097-4628(20000131)75:5<651::AID-APP7>3.0.CO;2-P].
Acrylic polyester resins containing perfluoropolyethers structures: Synthesis, characterization, and photopolymerization
Pilati F.;Toselli M.
2000
Abstract
Poly(ε-caprolactone-b-perfluoropolyether-b- ε-caprolactone) (PCL-PFPE-PCL) block copolymers having different PCL block lengths and end-capped with methacrylate groups were prepared and characterized. Spectroscopic analyses confirmed the expected molecular structure of the products. After UV curing, the films revealed the presence of two amorphous phases, corresponding to fluorinated and hydrogenated moieties, respectively. The material containing long PCL blocks showed also a crystalline phase. Surface properties of the UV-cured films were evaluated: The surfaces have a very high hydrophobic character in spite of the presence of many polar OH groups present in the polymeric network and a high hysteresis in wetting. An enrichment of fluorine at the air-side surface was shown by contact-angle measurements, except when long PCL sequences are present. The θadv angles decreased by increasing the content of PCL, that is, by decreasing the content of fluorine.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
