Mechanical properties and morphology of polystyrene-co-acrylic acid synthesized as membranes for fuel cells

Melo, L.; Benavides, R.; Martı́nez, Gema; Morales-Acosta, D.; Paula, M.M.S.; Silva, Luciano da

doi:10.1016/j.ijhydene.2017.02.210

Cited by 10 publications

(2 citation statements)

References 14 publications

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“…The tensile properties of the ANF aerogels with varied porosities were measured as shown in Figure 7. High tensile strength of 69.5 MPa and modulus of 2.3 GPa are achieved for the ANF aerogel with a porosity of 38%, which is comparable to or higher than many commercial nonporous polymer materials, such as polystyrene, 47 poly(vinyl chloride), 48 and poly(methyl methacrylate). 49 These results indicate that using rod-like ANFs to construct aerogel skeletons can preserve the high mechanical properties of the macroparent Kevlar fibers.…”

Section: Effects Of Solvent Exchange and Dryingmentioning

confidence: 82%

Ambient Drying Route to Aramid Nanofiber Aerogels with High Mechanical Properties for Low-k Dielectrics

Liu

Robertson

Qiang

et al. 2022

ACS Appl. Polym. Mater.

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Polymeric aerogels with low dielectric constant (low-k) are an important material solution for applications in high-frequency terminal electronic devices. However, most aerogels are prepared using high-cost supercritical drying or freeze-drying methods and typically exhibit poor mechanical properties and low thermal stability, which limits their use in practical applications. Here, we report the fabrication of aerogels with layered structure and hierarchical nanopores based on aramid nanofibers (ANFs), using a vacuum-assisted filtration method followed by low-cost ambient drying. The porosity of the ANF aerogels can be controlled from 38 to 79% by rationally selecting solvents with different surface tension for solvent exchange, tuning the affinity between solvents and ANF skeletons as well as controlling the solvent evaporation rate during the ambient drying process. The ANF aerogels have an ultralow and tunable dielectric constant as low as 1.56 while exhibiting a low dielectric loss between 0.0040 to 0.0055 at 1 MHz. The advantageous low-k property can be preserved at high temperatures up to 300 °C, and an inherent flame retardancy is achieved due to the rigid and all-aromatic backbone structure of poly(p-phenylene terephthalamide). Moreover, the nanoporous ANF layers with relatively lower porosity compared with the overall porosity of the aerogel provide strong mechanical strength and modulus, while the presence of larger nanopores from the interspacing of ANF layers ensures a high porosity for the entire aerogel, which endows the aerogel film with superior tensile strength and modulus compared with their conventional counterparts containing homogeneous porous structures. Collectively, these ANF aerogels exhibit low-k, outstanding mechanical properties, high thermal stability, and inherent flame retardancy, enabling them to become very promising next-generation dielectric materials.

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Section: Effects Of Solvent Exchange and Dryingmentioning

confidence: 82%

Ambient Drying Route to Aramid Nanofiber Aerogels with High Mechanical Properties for Low-k Dielectrics

Liu

Robertson

Qiang

et al. 2022

ACS Appl. Polym. Mater.

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“…This lower (or generally varied) measured IEC for IEMs compared to the theoretical IEC has been observed broadly across IEMs and is typically attributed to differences in film formation procedures (pretreatments, casting solvents, etc.) and a combination of impacts for the electrostatic and equilibrium of ion dissociation and migration, which are leveraged by the Mohr titration method for measuring IEC. − …”

Section: Resultsmentioning

confidence: 99%

Poly(acrylic acid)-Based Hydrogel Actuators Fabricated via Digital Light Projection Additive Manufacturing

Wang

Alizadeh

Barde

et al. 2022

ACS Appl. Polym. Mater.

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Electroactive polymers that exhibit controlled deformation under an applied electric field, either in liquid or air, have great potential as soft robotic actuators. However, materials for soft robotics currently face challenges, including slow response, high actuation potential, and a lack of underlying mechanistic understanding. Additionally, fabrication of soft robotic actuators with complex design features has historically been restricted by two-dimensional fabrication methods. In this work, we investigate cross-linked poly(acrylic acid)-based actuators prepared utilizing digital light projection (DLP), an additive manufacturing technique that enables fabrication of actuators with complex geometries. A series of photopolymerizable inks are prepared incorporating acrylic acid (monomer), trimethylolpropane trimethacrylate (cross-linker), and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide (photoinitiator). Soft actuators are 3D-printed utilizing a commercial DLP 3D printer operating under 405 nm UV light. These 3D-printed actuators exhibit large deformation (up to 43°), high actuation speed (up to 1.08°/s), and stable actuation performance for bending cycles under relatively low actuation voltage (4–6 V). Factors such as acrylic acid content, cross-linker concentration, actuator thicknesses, and electric field strength are varied, and their impact on the 3D-printed actuators are evaluated and discussed. Lastly, a membrane valve actuator is fabricated, and its ability to open and close under applied potential is demonstrated.

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A comparative study on the performance of highly conductive sulfonated poly(ether ether ketone) PEM modified by halloysite nanotubes, sulfonated polystyrene and phosphotungstic acid

Samaei

Bakeri

Lashkenari

2022

Korean J. Chem. Eng.

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Mechanical properties and morphology of polystyrene-co-acrylic acid synthesized as membranes for fuel cells

Cited by 10 publications

References 14 publications

Ambient Drying Route to Aramid Nanofiber Aerogels with High Mechanical Properties for Low-k Dielectrics

Ambient Drying Route to Aramid Nanofiber Aerogels with High Mechanical Properties for Low-k Dielectrics

Poly(acrylic acid)-Based Hydrogel Actuators Fabricated via Digital Light Projection Additive Manufacturing

A comparative study on the performance of highly conductive sulfonated poly(ether ether ketone) PEM modified by halloysite nanotubes, sulfonated polystyrene and phosphotungstic acid

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