Advanced and economical ambient drying method for controlled mesopore polybenzoxazine-based carbon xerogels: Effects of non-ionic and cationic surfactant on porous structure

Thubsuang, Uthen; Ishida, Hatsuo; Wongkasemjit, Sujitra; Chaisuwan, Thanyalak

doi:10.1016/j.jcis.2015.08.022

Cited by 21 publications

(15 citation statements)

References 52 publications

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“…Subsequently, a more time-saving and energyefficient approach to the preparation of PBO gels at room temperature uses HCl as a catalyst for ring-opened polymerization [16] and shortens the gelation time to about 1 h. PBO aerogels are then obtained by supercritical drying. The facile sol-gel process initiated by HCl-catalyzed ring-opened polymerization and the controllable pore structures of PBO aerogels are very attractive for aerogel thermal insulation materials.PBO aerogels are mainly used as precursors of carbon aerogels that applied to adsorption, supercapacitors, and medical hard tissue scaffolds, [17,18] and also used as precursors for energetic materials and catalysts. [19][20][21] However, there have been only a few reports on their application in thermal insulation.…”

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confidence: 99%

Thermal Insulation Characteristics of Polybenzoxazine Aerogels

Xiao

Zhang

et al. 2019

Macro Materials & Eng

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Polybenzoxazine (PBO) aerogels with low densities and low thermal conductivities are prepared from Bisphenol A (BPA) benzoxazine monomers by ring‐opened polymerisation using HCl as a catalyser at 10 °C. The obtained PBO aerogels have cross‐linked and 3D network structures with the densities ranging from 0.084 to 0.526 g cm−3. The thermal conductivities under different pressures (3–105 Pa, air) and different atmospheres (N2, Ar, and CO2, 105 Pa) are investigated. The thermal conductivities are in the range of 0.0335–0.0652 W m K−1 under ambient pressure and 0.0098–0.0571 W m K−1 at 3 Pa. The thermal transfer mechanism under different gas pressures is analyzed with increasing pressure. Under different atmospheres, the thermal conductivities decrease as the molecular weight of the gas increases. Compared with the traditional organic foam insulating materials of phenolic foam, polyurethane and polystyrene, which have similar apparent densities, PBO aerogels exhibit lower thermal conductivity of 0.0335 W m K−1 than that of traditional organic foam at room temperature.

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confidence: 99%

Thermal Insulation Characteristics of Polybenzoxazine Aerogels

Xiao

Zhang

et al. 2019

Macro Materials & Eng

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“…Moreover, the extensive variation of phenols and amines allows considerable design flexibility of their molecular architectures ; therefore their properties can be tailored to accommodate any desired applications. For example, PBz cured from dicarboxylic acid is used as a coating material for circuit boards and semiconductors.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and properties of main‐chain polybenzoxazines based on bisphenol‐S

Parveen

Kim

2017

Polymer Engineering & Sci

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Polybenzoxazines (PBzs) are novel thermosetting resins, having many prominent advantages, including high mechanical strength, innate flame retardancy, excellent dimensional stability, low water retention, beneficial dielectric, and relatively high char yields. In recent years, more attention has been paid to the synthesis of main‐chain PBz (MCPBz) precursors using difunctional amines and phenol. In this study, to enhance the rigidity and to improve the crosslink density of PBzs, novel high‐molecular‐weight PBz precursors were synthesized using bisphenol‐S, a diphenolic compound, and three different diamines (namely ethylene diamine, 1,4‐diaminobutane, and tetraethylenepentamine) through a Mannich‐type reaction. The onset of curing temperature for the three PBz precursors was much lower, in the range of 199–215°C, in comparison with bisphenol‐A and aniline‐based benzoxazine monomer [Tonset of BA‐a: 220°C]. The curing of PBz precursors proceeds via ring‐opening polymerization as monitored by FTIR analysis. Additionally, the polymer—PBz‐tepa possesses excellent thermal stability, showing 10% decomposition at 330°C with a char yield of 42.0%. Thus, the properties of PBz are greatly improved by preparing MCPBz and by incorporating sulfonyl group. POLYM. ENG. SCI., 58:1766–1773, 2018. © 2017 Society of Plastics Engineers

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“…The minimum surface area per surfactant molecule, surface tension, adsorption efficiency and surface tension reduction had been obtained. [6] Thubsuang (2015) revealed the effect of nonionic and ionic surfactants on the structure of emulsions. The research results showed that the concentrations of nonionic and ionic surfactants influence the mesopore diameters of emulsions during the process of emulsion.…”

Section: Introductionmentioning

confidence: 99%

“…The research results showed that the concentrations of nonionic and ionic surfactants influence the mesopore diameters of emulsions during the process of emulsion. [7] Enda Carey et al (2010) studied foaming properties of a mixed surfactant of the nonionic and the cationic. The foamability and foam stability of ionic surfactant was found to better than that of nonionic.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulations on effects of ionic / nonionic surfactant on oil‐water interface using dissipative particle dynamics

Wang

Zhao

et al. 2017

Asia-Pacific J Chem Eng

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Effects of surfactants on oil/water interface are studied using dissipative particle dynamics (DPD) at the mesoscopic scale. With a surfactant model, the effects of concentration of three types of surfactants, including ionic surfactant, nonionic surfactant, and the compound system of ionic and nonionic surfactant, on interfacial tension are analyzed in this study. Also, the distributions of interfacial tension and mean interfacial density are predicted. Simulated results indicate that the interfacial tension decreases with an increase of surfactant concentration. As the surfactant concentration increases to a certain value, the surfactant at the oil-water interface is saturated, and the interfacial tension will in-depend on surfactant concentration. It turns out to be that surfactants can be saturated just at the oil-water interface once its concentration reaches a certain value. A proper mixed ratio of compound system can reach a prime effect. Moreover, the inorganic salts can improve the interfacial efficiency of both ionic and nonionic surfactants, and lower interfacial tension. In addition, the temperature influences on surfactant aggregation behavior at the oil-water interface is discussed. Copyright Figure 1. Equilibrated morphology in oil/water system at different water content with nonionic surfactant ( a) water content of 10%; ( b)water content of 50%; (c) water content of 90% (The blue particles (W) represent the water beads, the red particles (O) represent the oil beads, the green particles (A) represent EO, the pink particles (B) represent PO).S. WANG ET AL.

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Advanced and economical ambient drying method for controlled mesopore polybenzoxazine-based carbon xerogels: Effects of non-ionic and cationic surfactant on porous structure

Cited by 21 publications

References 52 publications

Thermal Insulation Characteristics of Polybenzoxazine Aerogels

Thermal Insulation Characteristics of Polybenzoxazine Aerogels

Synthesis and properties of main‐chain polybenzoxazines based on bisphenol‐S

Numerical simulations on effects of ionic / nonionic surfactant on oil‐water interface using dissipative particle dynamics

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