Reactive Surfactants for Achieving Open‐Cell PolyHIPE Foams from Pickering Emulsions

Berezovska, Inna; Kapilov, Katya; Dhavalikar, Prachi; Cosgriff‐Hernandez, Elizabeth; Silverstein, Michael S.

doi:10.1002/mame.202000825

Cited by 15 publications

(8 citation statements)

References 63 publications

(67 reference statements)

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“…Researchers have made some attempts at adjusting and controlling the opening degree of polymer foam. − Reactive pore-openers are employed for preparing polyurethane foam (PUF) to improve pore opening. They can decelerate polymer chain elongation and prolong the low-viscosity state of matrices during foaming.…”

Section: Introductionmentioning

confidence: 99%

Formation of Interpenetrating-Phase Composites Based on the Combined Effects of Open-Cell PIF and Porous TPU Microstructures for Enhanced Mechanical and Acoustical Characteristics

Ren,

Wang,

Sun

et al. 2023

ACS Appl. Polym. Mater.

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The open-cell foam is a highly preferred soundabsorbing material used for improving indoor sound quality. Herein, polyimide foam (PIF) with an open-cell structure was synthesized through the introduction of oxalic acid dihydrate (H 2 C 2 O 4 •2H 2 O). The introduction and subsequent decomposition of H 2 C 2 O 4 •2H 2 O provided additional heterogeneous nucleation sites during foaming and promoted the formation of open-cell structures. The relation between H 2 C 2 O 4 •2H 2 O content and pore structure, the formation mechanism of open-cell structures, and the effect of H 2 C 2 O 4 •2H 2 O content on the sound absorption performance were analyzed. Furthermore, interpenetrating-phase thermoplastic polyurethane (TPU)/PIF composites were prepared via non-solvent-induced phase separation on the basis of the open-cell PIF. The formation of porous TPU microstructures and improvement of mechanical and acoustic properties of the interpenetrating-phase composites were discussed. Two main forms of TPU existed in the interpenetrating composites: microparticle TPU structure and microporous TPU structure. The compression strength (125.54 kPa) and sound insulation capacity of 10%TPU/PIF3 were 3.47 and approximately 5 times those of open-cell PIF3, respectively. Moreover, the average sound absorption coefficient (1000−6400 Hz) increased by 58.43% compared to that of opencell PIF3. The design based on the open-cell PIF promoted the enrichment of internal channels, and the construction of the internal channels with porous TPU microstructures achieved reflection enhancement and viscoelastic damping dissipation. Finally, the combined effects of the two designs synchronously enhanced the mechanical properties, sound absorption, and sound insulation properties of TPU/PIF materials, providing a thought for improving the acoustic properties of serialized polymer foam materials.

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Section: Introductionmentioning

confidence: 99%

Formation of Interpenetrating-Phase Composites Based on the Combined Effects of Open-Cell PIF and Porous TPU Microstructures for Enhanced Mechanical and Acoustical Characteristics

Ren,

Wang,

Sun

et al. 2023

ACS Appl. Polym. Mater.

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“…Recent developments in drug delivery systems have opened up new opportunities for the efficient delivery of drugs, including hydrophobic molecules for anti-tumor therapy, antigens for vaccines, or the engineered cells for adoptive cellular immunotherapy. [1][2][3][4] It is expected to strategically load different bioactive cargos, pass through the multiple barriers, accumulate inside the target organs or cells, and subsequently release the drugs in a controlled manner, resulting in greater bioactivities and fewer side effects.…”

Section: Introductionmentioning

confidence: 99%

Aggregating particles on the O/W interface: Tuning Pickering emulsion for the enhanced drug delivery systems

Ming

Xia

2022

Aggregate

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The rational design of drug delivery systems has led to enhanced targeting, increased efficiency, and a reduction of side effects in chemotherapies and vaccines. As most biological reactions took place at the interface, particle-stabilized emulsion (Pickering emulsion), may offer major implications for the advanced drug loading, delivery, and controlled release. In fact, it is the aggregating particles that determined the multi-level structure, multi-valent cellular interactions, and the multi-functional physiochemical properties in drug delivery. A deeper understanding on the tunable aggregating patterns and properties, as well as the underlying mechanisms, may pave the way for the efficient drug delivery, and also aided the progressing of "Aggregology" beyond molecules to particles, emulsions, and the biomedical applications. Here, the recent development of Pickering emulsions and their applications in drug delivery were thoroughly reviewed. Strategies to control over the physiochemical properties were illustrated based on particle properties, energy input, and the choices of continuous and dispersion phases. In particular, enough emphasis was attached on the structure-effect relationship between the tunable physiochemical properties and the delivery process, such as the multi-level structure for effective loading, flexibility and permeability for enhanced delivery, and the stimuli-responsiveness for the controlled release. By channeling the unique interfacial properties and the enhanced drug delivery efficiency, this work may shed light on the rational design of Pickering emulsions for the efficient drug delivery.

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“…Hypermer B246 − and Span 80 , are two common non-ionic surfactants used to stabilize w/o emulsions. Nevertheless, the surfactant removal from the final product is a laborious and costly process that can require intensive washing with solvents . Additionally, conventional PolyHIPEs possess small pores, typically 1–50 μm in size, which limits their application where the permeability is important or where large pores can be useful, for example, for vascularization in tissue engineering applications …”

Section: Introductionmentioning

confidence: 99%

Preparation of Interconnected Pickering Polymerized High Internal Phase Emulsions by Arrested Coalescence

et al. 2022

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Emulsion templating is a method that enables the production of highly porous and interconnected polymer foams called polymerized high internal phase emulsions (PolyHIPEs). Since emulsions are inherently unstable systems, they can be stabilized either by surfactants or by particles (Pickering HIPEs). Surfactant-stabilized HIPEs form materials with an interconnected porous structure, while Pickering HIPEs typically form closed pore materials. In this study, we describe a system that uses submicrometer polymer particles to stabilize the emulsions. Polymers fabricated from these Pickering emulsions exhibit, unlike traditional Pickering emulsions, highly interconnected large pore structures, and we related these structures to arrested coalescence. We describe in detail the morphological properties of this system and their dependence on different production parameters. This production method might provide an interesting alternative to poly-surfactant-stabilized-HIPEs, in particular where the application necessitates large pore structures.

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Reactive Surfactants for Achieving Open‐Cell PolyHIPE Foams from Pickering Emulsions

Cited by 15 publications

References 63 publications

Formation of Interpenetrating-Phase Composites Based on the Combined Effects of Open-Cell PIF and Porous TPU Microstructures for Enhanced Mechanical and Acoustical Characteristics

Formation of Interpenetrating-Phase Composites Based on the Combined Effects of Open-Cell PIF and Porous TPU Microstructures for Enhanced Mechanical and Acoustical Characteristics

Aggregating particles on the O/W interface: Tuning Pickering emulsion for the enhanced drug delivery systems

Preparation of Interconnected Pickering Polymerized High Internal Phase Emulsions by Arrested Coalescence

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