Hydrophobic and hydrophilic modification of hierarchically porous monolithic polyimide derivatives as functional liquid absorbers

Wang, Yan; Zhang, Luwei; Asoh, Taka‐Aki; Uyama, Hiroshi

doi:10.1039/d1ma00185j

Cited by 6 publications

(3 citation statements)

References 31 publications

(30 reference statements)

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“…According to our previous study, 32 the permeability of the resulting monoliths can be calculated using the equation B obtained monoliths, they were tightly fitted with heat shrink tubing and joined with a digital quantitative tubing pump (As One, DSP-100SA) to control the flow rate of the mobile phase and a digital pressure gauge (Krone, KDM30) to determine pressure drop. Then, the permeability of could be calculated by Darcy's law.…”

Section: Experimental Ssectionmentioning

confidence: 99%

“…According to our previous study, the permeability of the resulting monoliths can be calculated using the equation B 0 = F η L /(πr 2 Δ P ) (Darcy’s law), in which F (m 3 s –1 ) is the flow rate of the mobile phase, η (Pa s) is the viscosity of the mobile phase (0.89 × 10 –3 Pa s for water), L (m), and r (m) are the effective length and inner diameter of the column, respectively, and Δ P (Pa) is the pressure drop across the monolith. To determine the permeability of the obtained monoliths, they were tightly fitted with heat shrink tubing and joined with a digital quantitative tubing pump (As One, DSP-100SA) to control the flow rate of the mobile phase and a digital pressure gauge (Krone, KDM30) to determine pressure drop.…”

Section: Experimental Ssectionmentioning

confidence: 99%

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Facile Preparation of Hierarchically Porous Monolith with Optical Activity Based on Helical Substituted Polyacetylene via One-Step Synthesis for Enantioselective Crystallization

Wang

Zhang

Asoh

et al. 2021

ACS Appl. Mater. Interfaces

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The present study reported the flexible and highly efficient one-step synthesis of chiral hierarchical porous monoliths via cross-linking and polymerization-induced phase separation using substituted acetylene and cross-linker in the presence of porogenic solvent (tetrahydrofuran and methanol) in which the complex doping and complicated procedures were not required. It was demonstrated that hierarchical pore structure with through-pore and high surface area existed in the monoliths, which provides more chiral sites and space for interaction between monolithic materials and the solution. The porous structures and pore size can be adjusted by changing the conditions of phase separation. Moreover, the prepared monoliths exhibited good optical activity, thermal stability and mechanical properties. Therefore, the hierarchically porous monoliths with optical activity were applied in enantioselective crystallization and showed good performance.

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Section: Experimental Ssectionmentioning

confidence: 99%

Section: Experimental Ssectionmentioning

confidence: 99%

Facile Preparation of Hierarchically Porous Monolith with Optical Activity Based on Helical Substituted Polyacetylene via One-Step Synthesis for Enantioselective Crystallization

Wang

Zhang

Asoh

et al. 2021

ACS Appl. Mater. Interfaces

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“…Highly porous monolithic materials have fascinated researchers owing to their interesting properties, such as their light weight, large surface area, and low density, which are derived from their hierarchical pore and through-pore structures. , Among them, monoliths composed of organic polymers display great flexibility and toughness with dimensional stability compared with those composed of inorganic raw materials with brittleness . Therefore, polymeric monoliths are expected to be useful as supports for materials with variable stiffness.…”

Section: Introductionmentioning

confidence: 99%

Shape-Stabilized Monolithic Composite for Switchable Stiffness Based on Cellulose and Poly(stearyl methacrylate)

Roopsung,

Sugawara,

Hsu

et al. 2023

ACS Appl. Polym. Mater.

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Stiffness-changing materials (SCMs) have recently attracted attention because their mechanical strength can be changed in response to external stimuli. Although the stiffness of SCMs can be adjusted considerably, these materials do not necessarily possess sufficient mechanical robustness in their soft state, thereby limiting their practical applicability. In this study, a stimuli-responsive polymer was incorporated into a porous supporting material to fabricate SCMs with high structural stability. Poly(stearyl methacrylate) (PSMA) was utilized as the responsive domain owing to the phase-changing behavior of its long alkyl side chain. A cellulose monolith (CM) was selected as the support owing to its outstanding chemical and physical stability despite its high porosity. The PSMA-modified CM (PSMA-CM) exhibited clearly detectable stiffness changes in response to temperature as a result of melting and crystallization of the PSMA domain. The Young's modulus of PSMA-CM at 60 °C was half as large as that at 20 °C. Furthermore, during cyclic compressive loading− unloading tests, PSMA-CM displayed good shape recoverability, and the changes in its thermoresponsive stiffness were highly repeatable owing to both the stability of CM and the reversible responsive properties of PSMA. In addition, as opposed to CM, the stiffness of PSMA-CM decreased as the polarity of the surrounding solvent decreased. This result indicates that PSMA was composited not only onto the surface but also into the interior of the CM skeletal backbone. PSMA clearly reflects the variable stiffness of the monolith derived from the PSMA domain without impeding the dimensional stability of the material.

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Amphibious superamphiphilic polystyrene monolith with underwater superoleophilicity: Capture of underwater oil

Lam

Sheng

et al. 2021

Applied Surface Science

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Hydrophobic and hydrophilic modification of hierarchically porous monolithic polyimide derivatives as functional liquid absorbers

Abstract: A cost-effective and facile method was developed for the fabrication of two polyimide-based (PI-based) monoliths (pure PI monolith and hybrid PI monolith) with hierarchically porous structure that avoids the shortcomings...

Cited by 6 publications

References 31 publications

Facile Preparation of Hierarchically Porous Monolith with Optical Activity Based on Helical Substituted Polyacetylene via One-Step Synthesis for Enantioselective Crystallization

Facile Preparation of Hierarchically Porous Monolith with Optical Activity Based on Helical Substituted Polyacetylene via One-Step Synthesis for Enantioselective Crystallization

Shape-Stabilized Monolithic Composite for Switchable Stiffness Based on Cellulose and Poly(stearyl methacrylate)

Amphibious superamphiphilic polystyrene monolith with underwater superoleophilicity: Capture of underwater oil

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