Polyimide foams from powder: Experimental analysis of competitive diffusion phenomena

Cano, Camilo I.; Weiser, Erik S.; Kyu, Thein; Pipes, R. Byron

doi:10.1016/j.polymer.2005.07.056

Cited by 32 publications

(28 citation statements)

References 17 publications

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“…where F is the AO flux (atom/cm 2 s), DM is the mass loss (g), q is the density (g/cm 3 ), E y is the AO flux (cm 3 / atom), A is the exposure area (cm 2 ), and t is the exposure time (s). The dried samples were tested under AO flux of about 4.89 3 10 15 atom/cm 2 s for 7 h.…”

Section: Ground-based Ao Simulator and Testing Conditionmentioning

confidence: 99%

“…NASA Langley Research Center developed a series of TEEK @ PI foam for high‐performance applications such as the thermal protection system for a cryogenic tank integrated structure , in order to reduce the amount integration structure. In addition, PI foam has been widely applied in aerospace field because of its outstanding properties in terms of thermal stability, flame resistance, and cryogenic insulation .…”

Section: Introductionmentioning

confidence: 99%

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Investigation on polyimide/silica hybrid foams and their erosion resistance to atomic oxygen

Zhang

2014

Polym. Compos.

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A series of polyimide/silica (PI/SiO2) hybrid foams were prepared by the sol–gel process. Aminopropyltriethoxysilane was used as the coupling agent to enhance the compatibility between PI matrix and SiO2. Fourier transform infrared spectroscopy and scanning electron microscopy were used to analyze the chemical structure and cellular structure of PI/SiO2 hybrid foams. The results indicated that the three‐dimensional network of SiOSi was formed in the hybrid foams, and the hybrid foam presented the uniform cellular structure when the SiO2 content was less than 6 wt%. The thermal stability, dynamic mechanical property, and dielectric property of PI/SiO2 hybrid foams were investigated by dynamic mechanical analysis, thermogravimetric analysis, and vector network analyzer, respectively. The introduction of SiO2 improved the thermal stability and increased the storage modulus and glass‐transition temperature. The hybrid foams showed higher dielectric constants compared with the neat PI foam. The erosion resistance to atomic oxygen (AO) of PI/SiO2 hybrid foams was also evaluated in a ground‐based AO simulator. The surface morphology and chemical structure of PI/SiO2 hybrid foams before and after AO exposure were investigated by scanning electron microscopy, atomic force microscopy, and X‐ray photoelectron spectroscopy. The results revealed that the inorganic SiO2 protective layers were formed on the surface of PI/SiO2 hybrid foams after AO exposure, which could effectively improve the AO erosion resistance of PI/SiO2 hybrid foams. POLYM. COMPOS., 36:713–721, 2015. © 2014 Society of Plastics Engineers

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Section: Ground-based Ao Simulator and Testing Conditionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation on polyimide/silica hybrid foams and their erosion resistance to atomic oxygen

Zhang

2014

Polym. Compos.

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Section: Introductionmentioning

confidence: 99%

“…Given the molecular structure of matrix resin and cellular structures, polyimide foams (PIFs) present admirable low density, chemical and flame resistance, thermal stability and insulation, and acoustic absorption, and so on. [1][2][3][4][5][6][7] Owing to these superior properties, PIFs have been widely used as thermal and acoustic insulation materials in many advanced technology fields, such as spacecraft, aircraft, and marine. [8][9][10][11][12][13] At present, the technologies for producing PIFs with excellent combination property mainly depend on the powder or friable microsphere foaming technologies of polyimide precursors under microwave radiation and high temperature condition.…”

Section: Introductionmentioning

confidence: 99%

Effects of aramid honeycomb core on the flame retardance and mechanical property for isocyanate‐based polyimide foams

Sun

Wang

et al. 2017

J of Applied Polymer Sci

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In this work, composite materials containing aramid honeycomb core (ARHC) reinforced isocyanate‐based polyimide foams (IBPIFs) were prepared by a simple free‐foaming process. The flame retardance, smoke performance, and mechanical property of the composite materials along the transverse (W) and longitude (L) directions of ARHC were studied. Results of limiting oxygen index and cone calorimeter reveal that the space partition action of ARHC on IBPIFs, barrier action of honeycomb structure on fire, and generation of straight, flurry and porous char layer in the honeycomb cells during combustion effectively enhanced the flame retardance of IBPIFs. Mechanical property test shows that IBPIFs and ARHC presented a positive synergetic effect, and ARHC increased the compression strength of IBPIFs along the W and L directions of ARHC by approximately 300%. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45041.

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“…As the particles' temperature overcomes the material's glass transition temperature (i.e., ranging from 70 to 1108C), embedded nuclei are able to grow by diffusion and expansion of the volatile species within the particle and produce semispherical microstructures. Initial studies on the phenomenological aspects of the inflation process have been performed by Cano et al [2,3]. In these studies, it has been found that the inflation process depends highly on several parameters such as heating rate, particle morphology, and blowing agent concentration.…”

Section: Introductionmentioning

confidence: 99%

Modeling particle inflation from poly(amic acid) powdered precursors. II. Morphological development during bubble growth

Cano

Clark

Kyu

et al. 2007

Polymer Engineering & Sci

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The morphological development of cellular polyimide microstructures from poly(amic acid) powders has been shown to depend on the processing conditions throughout the inflation process and the morphological characteristics of the precursor particles. In an earlier publication the authors presented a numerical study of the preliminary stages prior to particle inflation when the processing temperature is below the glass transition temperature, Tg. In the present article, a second numerical scheme is presented for behavior above Tg in which bubble growth is modeled to account for the effect of multiple phenomena in the final stages of morphological development. The bubble growth kinematics and subsequent cessation of growth are predicted as a function of process parameters and material properties. Morphological characteristics of the precursor particles have also been shown to influence the kinematics of inflation. These results provide a clearer understanding of the solid‐state foaming processes for polyimide cellular materials. POLYM. ENG. SCI., 47:572–581, 2007. © 2007 Society of Plastics Engineers.

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Polyimide foams from powder: Experimental analysis of competitive diffusion phenomena

Cited by 32 publications

References 17 publications

Investigation on polyimide/silica hybrid foams and their erosion resistance to atomic oxygen

Investigation on polyimide/silica hybrid foams and their erosion resistance to atomic oxygen

Effects of aramid honeycomb core on the flame retardance and mechanical property for isocyanate‐based polyimide foams

Modeling particle inflation from poly(amic acid) powdered precursors. II. Morphological development during bubble growth

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