Sprayable perfluoropolyether / poly(ethylene glycol) segmented polyurethane coatings with micron-scale phase separated 3D structure

Nowak, Andrew P.; Gross, Adam F.; Sherman, Elena; Rodriguez, April R.; Ventuleth, Michael; Nelson, Ashley M.; Sorensen, Adam; Mott, Russell P.; Graetz, Jason

doi:10.1016/j.polymer.2020.123279

Cited by 3 publications

(7 citation statements)

References 33 publications

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Section: Resultsmentioning

confidence: 97%

“…Two-component films combining PEG and PFPE were previously synthesized using a sequential segmented urethane approach where (α,ω)-hydroxyl-terminated PEG and excess diisocyanate were initially reacted to form a prepolymer (Scheme 1). 35 Subsequently, (α,ω)-hydroxyl-terminated PFPE was introduced to the mixture and allowed to react. Due to the chemical dissimilarity between PEG and PFPE, these elements create an immiscible blend under the shear of mixing which influences the domain size of PEG-and PFPE-rich regions throughout the material.…”

Section: Resultsmentioning

confidence: 99%

“…Earlier work revealed the self-similar nature of the films at varying depths, providing a feature allowing the coating to present the identical inhomogeneous microstructure upon environmental wear. 35 While the present effort focuses on ice adhesion behavior of the initially sprayed surfaces, examination of repeated shedding and associated wear is an opportunity for future investigation. Topographic features on the films were found to be minimal based on SEM surface imaging, and root mean square roughness was typically <2 μm, thus reducing the potential contribution of increased adhesion due to the interlocking of ice through surface asperities.…”

Section: Resultsmentioning

confidence: 99%

“…Details of the synthesis and application of the series of PEG/PFPE copolymers and 100% PEG has been reported earlier along with methods including surface roughness measurements, SEM, ATR-FTIR spectroscopy, mechanical tensile testing, dynamic mechanical analysis (DMA), CLSM, and contact angle measurements. 35 Briefly, the PEG/PFPE copolymers and pure PEG are synthesized through the sequential addition of PEG and PFPE in the presence of excess diisocyanate (HMDI) and DBTDL as a catalyst (200 ppm). This prepolymer mixture was then able to be stored as a waxy solid that can be melted with heat (65 °C) or used promptly by dispersing in carrier solvent (THF) and adding a chain extender (BD) before spray application.…”

Section: Methodsmentioning

confidence: 99%

“…33,34 We look to build upon these strategies of compositional inhomogeneity by applying a recently reported synthetic system capable of compatibilizing multiple polymer components that spontaneously segregate into regions on the micron length scale. 35 This approach expresses microscopic regions of two relatively pure polymer species, simultaneously combining a low surface energy fluoropolymer and a hydrophilic species known to suppress freezing behavior at surfaces. Here, we report a segmented polyurethane system for passive icephobic coating performance pairing PEG and perfluoropolyether (PFPE).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Dual Component Passive Icephobic Coatings with Micron-Scale Phase-Separated 3D Structures

Nowak

Gross

Sherman

et al. 2021

ACS Appl. Mater. Interfaces

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A passive icephobic coating (τ ice < 20 kPa) is an enabling technology to many industries, including aerospace and energy and power generation, with recent efforts in materials research identifying strategies to achieve this low adhesion threshold. To better meet this need, we have combined low surface energy perfluoropolyether (PFPE) and hydrophilic poly-(ethylene glycol) (PEG) species in a segmented polyurethane thermoplastic elastomer. Coating microstructure presents a segregated 3D morphology at the micron-scale (1−100 μm) with discrete PFPE and continuous PEG phases self-similar through the thickness. Spray application produces a solid, mechanically tough film free of additive fluids or sacrificial elements, demonstrating exceptional ice adhesion reduction up to 1000× lower versus aluminum (τ ice < 1 kPa), as measured under environmentally realistic accretion and centrifugal test shedding conditions. Finally, the modular nature of the synthetic system allows PEG and PFPE to be exchanged for poly(tetramethylene oxide) to investigate performance drivers.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Dual Component Passive Icephobic Coatings with Micron-Scale Phase-Separated 3D Structures

Nowak

Gross

Sherman

et al. 2021

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

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A TiO2/polyurethane Composite for Photodegradation of Formaldehyde via Covalently Incorporation of Amino-functionalized TiO2

Zhu¹,

Tian²

2022

ASIR

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In this study, a TiO2/polyurethane composite (PU-TiO2) for photodegradation of formaldehyde was prepared based on TiO2 amino-functionalized with 3-aminopropyltriethoxysilane (APTS). FTIR, XPS, TG and TEM measurements demonstrated the successful amino-functionalization of TiO2 by APTS. Then the NH2-TiO2 were incorporated into polyurethane (PU) through urea linkages, and the thermal stability, mechanical properties as well as degradation efficiency of PU-TiO2 were investigated. PU-TiO2 possessed good thermal stability both in the storage and application. Compared with PU physically blended with TiO2, PU-TiO2 showed improved compatibility between PU and NH2-TiO2, evidenced by the enhanced mechanical properties. Most importantly, PU- TiO2 presented a good photoactivity for the degradation of formaldehyde.

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Recent Advances in Graphene-Based Nanocomposites for Ammonia Detection

2022

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The increasing demand to mitigate the alarming effects of the emission of ammonia (NH3) on human health and the environment has highlighted the growing attention to the design of reliable and effective sensing technologies using novel materials and unique nanocomposites with tunable functionalities. Among the state-of-the-art ammonia detection materials, graphene-based polymeric nanocomposites have gained significant attention. Despite the ever-increasing number of publications on graphene-based polymeric nanocomposites for ammonia detection, various understandings and information regarding the process, mechanisms, and new material components have not been fully explored. Therefore, this review summarises the recent progress of graphene-based polymeric nanocomposites for ammonia detection. A comprehensive discussion is provided on the various gas sensor designs, including chemiresistive, Quartz Crystal Microbalance (QCM), and Field-Effect Transistor (FET), as well as gas sensors utilising the graphene-based polymer nanocomposites, in addition to highlighting the pros and cons of graphene to enhance the performance of gas sensors. Moreover, the various techniques used to fabricate graphene-based nanocomposites and the numerous polymer electrolytes (e.g., conductive polymeric electrolytes), the ion transport models, and the fabrication and detection mechanisms of ammonia are critically addressed. Finally, a brief outlook on the significant progress, future opportunities, and challenges of graphene-based polymer nanocomposites for the application of ammonia detection are presented.

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Sprayable perfluoropolyether / poly(ethylene glycol) segmented polyurethane coatings with micron-scale phase separated 3D structure

Cited by 3 publications

References 33 publications

Dual Component Passive Icephobic Coatings with Micron-Scale Phase-Separated 3D Structures

Dual Component Passive Icephobic Coatings with Micron-Scale Phase-Separated 3D Structures

A TiO2/polyurethane Composite for Photodegradation of Formaldehyde via Covalently Incorporation of Amino-functionalized TiO2

Recent Advances in Graphene-Based Nanocomposites for Ammonia Detection

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