Thermal shrinkage and heat capacity of monolithic polymeric physical aerogels

Nagendra, Baku; Antico, Pasqualmorica; Daniel, Christophe; Rizzo, Paola; Guerra, Gaetano

doi:10.1016/j.polymer.2020.123073

Cited by 4 publications

(2 citation statements)

References 56 publications

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“…With respect to s-PS aerogels, PPO aerogels present a higher uptake capacity towards many organic compounds such as benzene; carbon tetrachloride; and several alkanes such as n-pentane, heptane, and decane [ 19 ]. The higher melting temperature of PPO nanoporous–crystalline phases [ 25 , 26 ] also ensures a higher thermal stability compared to s-PS aerogels, which in turn allows an easy and cheap regeneration by thermal treatments [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

Nanoporous–Crystalline Poly(2,6-dimethyl-1,4-phenylene)oxide Aerogels with Selectively Sulfonated Amorphous Phase for Fast VOC Sorption from Water

et al. 2022

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This paper describes the preparation and characterization of poly(2,6-dimethyl-1,4-phenylene)oxide (PPO) highly porous monolithic aerogels with a hydrophobic nanoporous–crystalline phase and a hydrophilic sulfonated amorphous phase. The sulfonated aerogels were obtained by the sulfonation of PPO physical gels, followed by the supercritical CO2 extraction of solvents. WAXD and FTIR analysis showed that the nanoporous–crystalline phase was preserved for a degree of sulfonation up to c.a. 35%, allowing a highly volatile organic compound (VOC) sorption capacity. The sulfonated PPO aerogels exhibited a high water sorption capacity, with a water uptake of up to 500 wt%, and faster VOC sorption kinetics from water with respect to unsulfonated aerogels.

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Section: Introductionmentioning

confidence: 99%

Nanoporous–Crystalline Poly(2,6-dimethyl-1,4-phenylene)oxide Aerogels with Selectively Sulfonated Amorphous Phase for Fast VOC Sorption from Water

et al. 2022

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“…are capable of forming thermoreversible gels in various solvents where the junction zones of the gel network are made up of polymer crystalline phases, which provide the required robustness to the system. Among them, sPS and PPO received remarkable attention due to their ability to form physical aerogels with crystalline nanoporosity. ,− …”

Section: Introductionmentioning

confidence: 99%

Nanoporous Crystalline Aerogels of Syndiotactic Polystyrene: Polymorphism, Dielectric, Thermal, and Acoustic Properties

et al. 2021

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Hierarchically porous crystalline nanoporous aerogels of syndiotactic polystyrene (sPS) received much attention because of their unique nanoporous structures along with meso-and macroporosity. Depending on the difference in the packing of polymer chains within the crystal lattice, sPS has two nanoporous crystalline forms, namely, δ and ε forms (δ e and ε e ). In this study, we have prepared high-purity nanoporous δ and ε forms of sPS aerogels from their respective gels using a solvent exchange strategy with green solvents, followed by an environmentally friendly freeze-drying technique. Using these highly porous aerogels, the phase transition behavior of sPS at higher temperatures was investigated. The δ e form showed a complex phase transition behavior on heating, and at a higher temperature, the γ form (obtained through an intermediate helical phase) transformed into a mixture of α and β forms. On the other hand, the ε e form transformed directly into the γ form, and on further heating, the γ form transformed exclusively into the α form. The dielectric, thermal, and acoustic properties of crystallinenanoporous aerogels were promising with an ultralow dielectric constant (1.02 ± 0.02), thermal conductivity (λ) as low as 0.04 W m −1 K −1 , and a high sound absorption coefficient (close to 1). Moreover, these aerogels exhibited excellent oleophilicity, which was demonstrated in oil/organic solvent separation experiments. These multifunctional aerogels of sPS can, therefore, find a multitude of applications, especially in thermal and acoustic insulation and molecular sorption of oil/organic solvents.

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Thermal stability investigations of different aerogel insulation materials at elevated temperature

Kovács

Csík

Lakatos

2023

Thermal Science and Engineering Progress

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Thermal shrinkage and heat capacity of monolithic polymeric physical aerogels

Cited by 4 publications

References 56 publications

Nanoporous–Crystalline Poly(2,6-dimethyl-1,4-phenylene)oxide Aerogels with Selectively Sulfonated Amorphous Phase for Fast VOC Sorption from Water

Nanoporous–Crystalline Poly(2,6-dimethyl-1,4-phenylene)oxide Aerogels with Selectively Sulfonated Amorphous Phase for Fast VOC Sorption from Water

Nanoporous Crystalline Aerogels of Syndiotactic Polystyrene: Polymorphism, Dielectric, Thermal, and Acoustic Properties

Thermal stability investigations of different aerogel insulation materials at elevated temperature

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