Microcellular foamed aromatic polyamides (aramids). Structure, thermal and mechanical properties

Pascual, B.; Trigo‐López, Miriam; Ramos, C.; Sanz, Marı́a Teresa; Pablos, Jesús L.; García, Félix C.; Ruiz, José A. Reglero; García, José Miguel

doi:10.1016/j.eurpolymj.2018.11.007

Cited by 19 publications

(16 citation statements)

References 18 publications

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“…of the IL 1-allyl-3-methylimidazolium chloride. It is important to remark that in a previous study, [3] lower percentages of IL were loaded to the polyamide, but no porous structure was observed.…”

Section: Preparation Of Aromatic Polyamidesmentioning

confidence: 70%

“…(Mechanical data of dense MPIA film was extracted from our previous work. [3]) MPa(gcm -3 ) -1 , then showing a ductile behavior compared to dense aramid film.…”

Section: Thermal and Mechanical Propertiesmentioning

confidence: 99%

“…In our previous work, [3] we reported the development of foamed aramids using a nonvolatile ionic liquid (1-allyl-3-methylimidazolium chloride) and supercritical CO 2 (ScCO 2 ) for the first time. We successfully lowered the density of commercial MPIA from 1.48 to 0.31 g•cm -3 while maintained the exceptional mechanical and thermal properties.…”

Section: Introductionmentioning

confidence: 99%

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Porous aromatic polyamides the easy and green way

Pascual

Trigo‐López

Ruiz

et al. 2019

European Polymer Journal

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Section: Preparation Of Aromatic Polyamidesmentioning

confidence: 70%

“…(Mechanical data of dense MPIA film was extracted from our previous work. [3]) MPa(gcm -3 ) -1 , then showing a ductile behavior compared to dense aramid film.…”

Section: Thermal and Mechanical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Porous aromatic polyamides the easy and green way

Pascual

Trigo‐López

Ruiz

et al. 2019

European Polymer Journal

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“…One of these approaches is focused on the use of ionic liquids (ILs) due to their good compatibility combined with their enhancement of CO 2 absorption [12,13]. Our group recently developed a very promising technique in which commercial aramid films based on poly(m-phenylene isophthalamide) (MPIA) were effectively foamed through the ScCO 2 batch foaming process using ionic liquids (ILs) (1-allyl-3-methylimidazolium chloride) to nucleate and retain the CO 2 molecules [14]. We surprisingly observed that porous aramids could be fabricated by removing the IL in distilled water (avoiding the use of ScCO 2 ) [15], which simplified the mechanism to obtain porous structures and had not been previously reported in the literature [16].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of microporous PMMA using ionic liquids: An improved route to classical ScCO2 foaming process

Trigo‐López

Vallejos

Ruiz

et al. 2019

Polymer

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“…Specific features of gas-filled plastics determine the technical trends and economic efficiency of their application in various industries. Due to low density, high thermal and acoustic properties, high specific strength, and a number of other valuable technological and operational properties, foam plastics are widely used in up-to-date industry [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Influence of the nature and concentration of porogens on the structure and properties of phenylone

Sytar¹,

Kuzyayev²,

Sukhyy³

et al. 2019

VKhKhT

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Experimental and theoretical studies in the field of development and modernization of gas-filled polymeric materials were analyzed. The foamed material structure was shown to be dependent on the nature and concentration of porogens. The choice of phenylone as a polymer matrix and magnesium carbonate as a gasifier was substantiated to develop heatproof foamed polymer compositions with increased strength properties. Thermal gravimetric analysis of the substances formed at the temperatures of phenylone transitions to the state of viscous flow with emission of gaseous products was performed. According to experimental results, magnesium carbonate (MgCO 3) was chosen as a porogen that is decomposed during heating with the formation of carbon dioxide and magnesium oxide. The most intense gas production process proceeded at 590 K during 15-20 min. The high values of melt viscosity of aromatic polyamide phenylone considerably blocked pore formation in the bulk of a polymer. In order to decrease the viscosity of the melt composition, it was doped with 2-3 wt.% of oligodimethylsiloxane. The results of thermomechanical study revealed that magnesium oxide, which was formed when magnesium carbonate was decomposed, have a thermostabilizing effect on the polymer, which resulted in an increase in the glass transition temperature of phenylone. It was shown that the main characteristics of the developed materials (density, thermal conductivity, and specific heat capacity) were strongly affected by porogen concentration. The study of the surface morphology of the samples exhibited a highly dispersed structure in the polymer volume with pore size close to 100-300 m. Comparative analysis of foamed phenylone and commercial foamed plastics revealed that the maximal operational temperature was about 653 K for the materials developed in this work, whereas this parameter was close to 423 K for known foamed plastics. The developed material can be recommended to use for heat insulation in aircraft and aerospace industries.

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Microcellular foamed aromatic polyamides (aramids). Structure, thermal and mechanical properties

Cited by 19 publications

References 18 publications

Porous aromatic polyamides the easy and green way

Porous aromatic polyamides the easy and green way

Fabrication of microporous PMMA using ionic liquids: An improved route to classical ScCO2 foaming process

Influence of the nature and concentration of porogens on the structure and properties of phenylone

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