UV Curing of Perfluoropolyether Oligomers Containing Graphene Nanosheets to Enhance Water‐Vapor Barrier Properties

Vitale, Alessandra; Merlo, Simone; Rizza, Giancarlo; Melilli, Giuseppe; Sangermano, Marco

doi:10.1002/macp.201400225

Cited by 16 publications

(6 citation statements)

References 40 publications

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“…In order to better characterize our intermediate molds, we evaluated their wettability by performing water contact angle measurements. The contact angle was 93 ± 5°, which was in line with what was reported by other authors for PFPE substrates [ 26 ].…”

Section: Resultssupporting

confidence: 92%

Perfluoropolyether (PFPE) Intermediate Molds for High-Resolution Thermal Nanoimprint Lithography

et al. 2018

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Among soft lithography techniques, Thermal Nanoimprint Lithography (NIL) is a high-throughput and low-cost process that can be applied to a broad range of thermoplastic materials. By simply applying the appropriate pressure and temperature combination, it is possible to transfer a pattern from a mold surface to the chosen material. Usually, high-resolution and large-area NIL molds are difficult to fabricate and expensive. Furthermore, they are typically made of silicon or other hard materials such as nickel or quartz for preserving their functionality. Nonetheless, after a large number of imprinting cycles, they undergo degradation and become unusable. In this paper, we introduce and characterize an innovative two-step NIL process based on the use of a perfluoropolyether (PFPE) intermediate mold to replicate sub-100 nm features from a silicon mold to the final thermoplastic material. We compare PFPE elastomeric molds with molds made of the standard polydimethylsiloxane (PDMS) elastomer, which demonstrates better resolution and fidelity of the replica process. By using PFPE intermediate molds, the nanostructured masters are preserved and the throughput of the process is significantly enhanced.

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Section: Resultssupporting

confidence: 92%

Perfluoropolyether (PFPE) Intermediate Molds for High-Resolution Thermal Nanoimprint Lithography

et al. 2018

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“…In the field of polymers, they have been proposed to make functional materials by incorporating them into polymeric matrices. In addition, inserting graphene nanoplatelets into UV-curable perfluoropolyether methacrylic oligomers was investigated to achieve gas barrier properties . By combining the hydrophobicity of the highly fluorinated photopolymer with the tortuous path induced by the graphene sheets, the barrier properties of the cross-linked films were enhanced.…”

Section: Dual Curing Processes For Obtaining Fluorinated Organic–inor...mentioning

confidence: 99%

“…By combining the hydrophobicity of the highly fluorinated photopolymer with the tortuous path induced by the graphene sheets, the barrier properties of the cross-linked films were enhanced. Acting both on the thermodynamic (low solubility) and kinetics (longer diffusion path) contributions of the water-vapor diffusion through the polymeric films, the permeability was halved in the presence of only 0.3 wt % graphene …”

Section: Dual Curing Processes For Obtaining Fluorinated Organic–inor...mentioning

confidence: 99%

Fluorinated Oligomers and Polymers in Photopolymerization

2015

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“…In fact, the existence of polarity in the partially fluorinated polymers strongly influences the interfacial properties, leading to a reduction of adhesion and friction, to a good protection against corrosion, environmental pollution, weather aggression and graffiti: all peculiar coating characteristics [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Modification of photocurable epoxides by new perfluoropolyalkylether alcohols for obtaining self-cleaning coatings

Trusiano

Rizzello

Vitale

et al. 2019

Progress in Organic Coatings

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Perfluoropolyalkylether (PFPAE) structures can be functionalized with alcoholic groups using an appropriate synthetic pathway: these new fluorinated alcohols can be used as surface modifying agents, through chain transfer mechanism in cationic UV-curing of an epoxy system. Notwithstanding their very low concentration (only ≤5 wt%), the fluorinated alcohols are able to induce a dramatic improvement to the surface properties of the films, without substantially modifying their curing conditions and their bulk properties, neither their transparency. As confirmed by Fourier Transform-Infra Red (FT-IR) spectroscopy and X-ray photoelectron spectroscopy (XPS) measurements, the fluorinated comonomers tend to concentrate selectively at the outermost layer of the epoxy UVcured coatings, by spontaneously migrating to the free surface due to their low surface tension. The surface modification of the films depends on the concentration of the fluoroalcohols: coatings

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UV Curing of Perfluoropolyether Oligomers Containing Graphene Nanosheets to Enhance Water‐Vapor Barrier Properties

Cited by 16 publications

References 40 publications

Perfluoropolyether (PFPE) Intermediate Molds for High-Resolution Thermal Nanoimprint Lithography

Perfluoropolyether (PFPE) Intermediate Molds for High-Resolution Thermal Nanoimprint Lithography

Fluorinated Oligomers and Polymers in Photopolymerization

Modification of photocurable epoxides by new perfluoropolyalkylether alcohols for obtaining self-cleaning coatings

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