Fluorinated networks through photopolymerisation processes: synthesis, characterisation and properties

Bongiovanni, Roberta Maria; Malucelli, Giulio; Sangermano, Marco; Priola, Aldo

doi:10.1016/j.jfluchem.2003.07.017

Cited by 22 publications

(21 citation statements)

References 30 publications

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“…This behavior was observed previously for UV-cured systems containing a low amount of fluorinated additives. [20][21][22] Through a selective surface segregation of the fluorinated acrylic resin toward the less polar interface (air), highly hydrophobic cured films are achieved showing typical adhesion values of an epoxy matrix (which should be the main component for the hybrid cured films in contact with glass).…”

Section: Resultsmentioning

confidence: 99%

Interpenetrating Polymer Networks of Hydrocarbon and Fluorocarbon Polymers: Epoxy/Fluorinated Acrylic Macromonomers

Sangermano

Carbonaro

Bongiovanni

et al. 2010

Macro Materials & Eng

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A fluorinated acrylic resin was synthesized for use as a co‐monomer with a commercially available epoxy resin for UV‐cured interpenetrating polymer network preparation. Hybrid IPN networks were achieved with morphology ranging from a co‐continuous IPN to complete phase separation simply by changing monomer ratios. Highly hydrophobic coatings with good adhesion properties on glass substrates were obtained.

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Section: Resultsmentioning

confidence: 99%

Interpenetrating Polymer Networks of Hydrocarbon and Fluorocarbon Polymers: Epoxy/Fluorinated Acrylic Macromonomers

Sangermano

Carbonaro

Bongiovanni

et al. 2010

Macro Materials & Eng

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“…The main issues to prepare the HBP-PFUA blends were the high viscosity of the PFUA and the polarity difference between the two constituents resulting in inhomogeneous solutions beyond 1 wt. % of PFUA as previously reported [39]. In all cases, the PFUA had a tendency to phase separate from HBP with time, so it was essential to remix the solutions prior to any measurement and further processing.…”

Section: Methodsmentioning

confidence: 78%

A Facile in Situ and UV Printing Process for Bioinspired Self-Cleaning Surfaces

et al. 2016

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A facile in situ and UV printing process was demonstrated to create self-cleaning synthetic replica of natural petals and leaves. The process relied on the spontaneous migration of a fluorinated acrylate surfactant (PFUA) within a low-shrinkage acrylated hyperbranched polymer (HBP) and its chemical immobilization at the polymer-air interface. Dilute concentrations of 1 wt. % PFUA saturated the polymer-air interface within 30 min, leading to a ten-fold increase of fluorine concentration at the surface compared with the initial bulk concentration and a water contact angle (WCA) of 108 • . A 200 ms flash of UV light was used to chemically crosslink the PFUA at the HBP surface prior to UV printing with a polydimethylsiloxane (PDMS) negative template of red and yellow rose petals and lotus leaves. This flash immobilization hindered the reverse migration of PFUA within the bulk HBP upon contacting the PDMS template, and enabled to produce texturized surfaces with WCA well above 108 • . The synthetic red rose petal was hydrophobic (WCA of 125 • ) and exhibited the adhesive petal effect. It was not superhydrophobic due to insufficient concentration of fluorine at its surface, a result of the very large increase of the surface of the printed texture. The synthetic yellow rose petal was quasi-superhydrophobic (WCA of 143 • , roll-off angle of 10 • ) and its self-cleaning ability was not good also due to lack of fluorine. The synthetic lotus leaf did not accurately replicate the intricate nanotubular crystal structures of the plant. In spite of this, the fluorine concentration at the surface was high enough and the leaf was superhydrophobic (WCA of 151 • , roll-off angle below 5 • ) and also featured self-cleaning properties.

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“…However, it was neglected in previous discussions that the interface might be covered by a third incompatible phase (not visible in the AFM images), deriving from the reactive end groups of the macromolecular crosslinker. This is particularly true for PHEA-l-PFPE conetworks of compositions with a high content of the crosslinker, because the hydrophobic nonfluorinated urethane-based end groups account for 7.7 wt.% of the macromonomer and are not miscible with the perfluorinated main chain (Bongiovanni et al, 2004).…”

Section: Resultsmentioning

confidence: 99%

Amphiphilic conetworks as activating carriers for the enhancement of enzymatic activity in supercritical CO₂

Bruns

Bannwarth

Tiller

2008

Biotech & Bioengineering

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Enzymatic reactions in supercritical carbon dioxide (scCO2) represent a way of combining the advantages of biocatalysis with the environmental benign nature of scCO2 as a solvent. Here we demonstrate that activities of enzymes in scCO2 can be greatly enhanced by incorporating them into amphiphilic conetworks (APCNs), a novel type of enzyme support. Two sets of hydrophilic/scCO2-philic APCNs, poly(2-hydroxyethyl acrylate)-linked by-poly(dimethylsiloxane) (PHEA-l-PDMS) and poly(2-hydroxyethyl acrylate)-linked by-perfluoropolyether (PHEA-l-PFPE), were prepared and loaded with the synthetically relevant lipase from Rhizomucor miehei. The effect of the APCNs' composition on the amount of the absorbed lipase was studied. It is observed that both sets of lipase-loaded APCNs enhance the catalytic activity of the enzyme in scCO2. The chemical nature of the scCO2-philic phase as well as the conetworkscomposition greatly influences the activity of the lipase in the conetworks. Activities obtained with PFPE-basedAPCNS were up to 10-fold higher than those obtained with PDMS-based conetworks. The highest specific activity measured corresponds to a 2,000-fold activation compared to the lyophilized enzyme powder. This activity is 10 times higher than the specific activity of the lipase immobilized on an optimized commercial carrier.

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Fluorinated networks through photopolymerisation processes: synthesis, characterisation and properties

Cited by 22 publications

References 30 publications

Interpenetrating Polymer Networks of Hydrocarbon and Fluorocarbon Polymers: Epoxy/Fluorinated Acrylic Macromonomers

Interpenetrating Polymer Networks of Hydrocarbon and Fluorocarbon Polymers: Epoxy/Fluorinated Acrylic Macromonomers

A Facile in Situ and UV Printing Process for Bioinspired Self-Cleaning Surfaces

Amphiphilic conetworks as activating carriers for the enhancement of enzymatic activity in supercritical CO₂

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Fluorinated networks through photopolymerisation processes: synthesis, characterisation and properties

Cited by 22 publications

References 30 publications

Interpenetrating Polymer Networks of Hydrocarbon and Fluorocarbon Polymers: Epoxy/Fluorinated Acrylic Macromonomers

Interpenetrating Polymer Networks of Hydrocarbon and Fluorocarbon Polymers: Epoxy/Fluorinated Acrylic Macromonomers

A Facile in Situ and UV Printing Process for Bioinspired Self-Cleaning Surfaces

Amphiphilic conetworks as activating carriers for the enhancement of enzymatic activity in supercritical CO2

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Product

Resources

About

Amphiphilic conetworks as activating carriers for the enhancement of enzymatic activity in supercritical CO₂