Perfluoropolyether structures as surface modifying agents of UV-curable systems

Bongiovanni, Roberta Maria; Malucelli, Giulio; Pollicino, Antonino; Tonelli, Claudio; Simeone, Giovanni; Priola, Aldo

doi:10.1002/macp.1998.021990625

Cited by 22 publications

(30 citation statements)

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“…In comparison with thermal curing, photocuring is a faster and less energy-consuming process and has been recently employed to obtain low surface energy films by Bongiovanni et al [8][9][10][11][12][13]. In most cases, they used a special fluorinated oligomer, perfluoropolyether, which is difficult to synthesize and mainly located in the middle of polymer main chains.…”

Section: Introductionmentioning

confidence: 98%

Low surface energy polymeric films from partially fluorinated photocurable solventless liquid oligoesters

et al. 2001

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We have recently shown that low surface energy polymeric films can be readily obtained from partially fluorinated hydroxyl-end-capped solventless liquid oligoesters by thermal curing [1]. Photocurable liquid oligoesters can be prepared by further substituting the remaining hydroxyl end groups with acrylic double bonds. A conventional photoinitiator containing 2-hydroxy-2-methylpropiophenone was used to cure the liquid oligoesters. As the fluorine content increases from 0 to about 1.57 wt %, the surface energy decreases by about 14 mN/m. The fluorine level in the outer few nanometers is significantly greater than that in the bulk, as revealed by XPS studies. The driving force for the surface segregation of fluorinated species comes from the large difference in surface energy between the oligoesters and their fluorinated counterparts.

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Section: Introductionmentioning

confidence: 98%

Low surface energy polymeric films from partially fluorinated photocurable solventless liquid oligoesters

et al. 2001

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“…For example, the static contact angles of the composites increased up to about 97.6 6 0. 4 and 96.4 6 0.6 when the content of PCL 78 -b-PTFEMA 86 and PTFEMA 44 -b-PCL 74 -b-PTFEMA 44 was 3.3 wt %, respectively. Water contact angles of composites were about 20 larger than those of the control epoxy, suggesting that the surface hydrophobicity was significantly improved.…”

Section: Surface Properties Of Fluorinated Copolymer-containing Compomentioning

confidence: 99%

Copolymer architecture effects on the morphology and surface performance of epoxy thermosets containing fluorinated block copolymers

Zheng

Xue

Zhu

et al. 2014

J Polym Sci B Polym Phys

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The architecture effects on phases and surface enrichment behaviors of epoxy nanocomposites containing fluorinated block copolymers are investigated by the incorporation of two novel copolymers composed of poly (2, 2, 2-trifluoroethyl methacrylate) (PTFEMA) and poly (e-caprolactone) (PCL), PCL-b-PTFEMA and PTFEMA-b-PCL-b-PTFEMA, with identical molecular weight and composition. These fluorinated copolymers in epoxy display distinguished self-assembled structures, as evidenced by dynamic laser scattering and scanning electron microscopy measurements. Static contact angle detection suggests that the nanocomposites display an obvious improvement in surface water repellency and a reduction in surface free energy. The enhancement in surface hydrophobicity is attributed to the enrichment of PTFEMA blocks at the nanocomposite surface and to the formation of the specific surface morphology, as confirmed by atomic force microscopy. The different architectures of the two block copolymers give rise to differences in phase-structures, and the ultimate surface performances of composites.

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“…[6,7] In our case the use of lower energy UV-A light was preferred. UV-B allows a much faster photocuring and is used especially in coating technology.…”

Section: Crosslinkingmentioning

confidence: 99%

“…[6,7] However, there are no examples of photocurable fluoropolymers as matrices for composites in the open literature. Perfluoropolyether reactive oligomers are low viscosity and low glass transition liquids characterized by low surface energy and solubility parameters.…”

Section: Introductionmentioning

confidence: 99%

Novel Glass Fiber‐Reinforced Composites Having a UV and Peroxy Curable Fluoropolymer Matrix

Turri¹,

Sanguineti²,

Lecchi³

2003

Macro Materials & Eng

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Novel glass fiber‐reinforced composites were prepared from E‐glass fibers and perfluoropolyether (PFPE), polyurethane acrylate, and methacrylate resins. The PFPE resins were synthesized by a two‐step process and formulated with reactive acrylic diluents obtaining two compositions with different viscosity and fluorine content. These formulations were photocrosslinked by UV‐A radiation and characterized by tensile and dynamic‐mechanical properties as well as by impact resistance. The two UV cured fluoropolymer compositions are high modulus (> 1 GPa), polyphasic materials characterized by a fracture toughness higher than conventional polymer matrices, like epoxies and unsaturated polyesters. Unidirectional laminate composites were also prepared by hand lay‐up and crosslinked both photochemically and thermally. Mechanical characterization of glass fiber‐reinforced composites was carried out by tensile tests and shear adhesion measurements, showing a good fluoropolymer‐glass adhesion strength (ca. 9 MPa). Surface characterization of composites by static contact angle measurements allowed the calculation of the total surface tension γs according to Wu's harmonic mean approximation. Surface tension is very low (< 20 mN/m) suggesting a preferential stratification of PFPE segments at the material‐air interface. magnified image

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Perfluoropolyether structures as surface modifying agents of UV-curable systems

Cited by 22 publications

References 0 publications

Low surface energy polymeric films from partially fluorinated photocurable solventless liquid oligoesters

Low surface energy polymeric films from partially fluorinated photocurable solventless liquid oligoesters

Copolymer architecture effects on the morphology and surface performance of epoxy thermosets containing fluorinated block copolymers

Novel Glass Fiber‐Reinforced Composites Having a UV and Peroxy Curable Fluoropolymer Matrix

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