The pyrolysis behaviors of polyimide foam derived from 3,3′,4,4′‐benzophenone tetracarboxylic dianhydride/4,4′‐oxydianiline

Shen, Yan-Xia; Zhan, Mei; Wang, Kai; Li, Xiaohuan; Pan, Pi-Chang

doi:10.1002/app.31189

Cited by 28 publications

(21 citation statements)

References 65 publications

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“…Through further analysis, the unstable carboxylic acid end groups can decompose into CO 2 . The poly(amic‐acid) generated from 3,4′‐ODA and PMDA could cause the decrease of unstable carboxylic acid end groups and the increase of imide ring after postcure 15…”

Section: Resultsmentioning

confidence: 99%

Effects of 3,4′‐oxydianiline on the structures and properties of a novel aromatic polyimide foam

Yin

Liu

Zhan

et al. 2012

J of Applied Polymer Sci

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Aiming at the low volumetric shrinkage, a novel aromatic polyimide foam is successfully prepared from polymethane polyphenyl isocyanate (PAPI) and a poly(amic-acid) precursor which has been synthesized from 3,4 0 -oxydianiline (3,4 0 -ODA) and pyromellitic dianhydride (PMDA). In this research, five polyimide foams, with different contents of 3,4 0 -ODA, are comparatively studied including structural, thermal, mechanical, shrink, and degradation properties. The results indicate that the content of 3,4 0 -ODA has minor influence on chemical structures, but significant influence on cell structures of the foams. With the increase of 3,4 0 -ODA, the volumetric shrinkages, apparent densities and the compressive and flatwise tensile strengths of the materials decrease. The glass transition temperatures (T g ) decrease from 301 C to 279 C, and the 5% weight loss temperatures (T 5% ) increase from 323 C to 340 C. Through TG-FTIR analysis, we can observe that the addition of 3,4 0 -ODA has no influence on the pyrolysis mechanism of polyimide foams.

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Section: Resultsmentioning

confidence: 99%

Effects of 3,4′‐oxydianiline on the structures and properties of a novel aromatic polyimide foam

Yin

Liu

Zhan

et al. 2012

J of Applied Polymer Sci

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“…The pyrolysis pathway [6][7][8] and kinetics [6,[8][9][10][11][12][13] of aromatic polyimides have been investigated in detail, indicating that the pyrolysis of aromatic PIs requires a temperature of more than 500 • C and produces a lowvalue CO-and CO 2 -rich gas as well as more than 50 wt% carbonized solid.…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis and hydrolysis behaviors during steam pyrolysis of polyimide

Kumagai

Hosaka

Kameda

et al. 2016

Journal of Analytical and Applied Pyrolysis

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“…[5][6][7] Several methods have been adopted to prepare PI foams, for example, adding a blowing agent or using the remaining solvent as vesicant, producing pyrolysis holes after mixing thermally inner and active polymers or using the phase inversion method. [8][9][10] Some of them need additives, while the others use solvents to make pores. In the regular foaming methods, such as powder thermal foaming, microwave foaming, or foaming via chemical blowing agent, the precursors are heated to evaporate the blowing agent.…”

Section: Introductionmentioning

confidence: 99%

A novel vacuum-assisted method for fabricating flexible polyimide foams from 3,3′,4,4′-oxydiphthalic anhydride/4,4′-oxydianiline

Ting

Guo

2016

High Performance Polymers

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In this research, a novel method for fabricating flexible polyimide foams was developed. The foam was derived from the precursor synthesized via esterification of 3,3 0 ,4,4 0 -oxydiphthalic anhydride and 4,4 0 -oxydianiline. After drying process, the remaining solvent acted as blowing agent. By adjusting the synthesis condition, low-molecular weight precursor was obtained and can be foamed under environment temperature. With this novel type of precursor and vacuum-assisted foaming process, we could easily obtain any shape of foams, which was easy to process under relatively low temperature. The foam could be imidized later in order to improve mechanical strength. During the imidization process, in situ Fourier transform infrared (FTIR) analysis was applied to analyze the variation of the imidization percentage with time. The density of the foams could be adjusted from 12 to 30 kg m À3 with uniform cell structure. Other properties of foams were also investigated. The glass transition temperature of the precursor was 70 C, which is obviously lower than that of the usual previously reported. The 5% and 10% weight loss temperatures of the finally imidized foam can reach up to 567 C and 593 C, respectively. The foams belong to open cell structure with 98% open cell content. The limiting oxygen index of the foams varied from 38.6 to 41.9, depending on foam densities. The compressive strength of the foam ranged from 30.6 to 90.6 kPa when the density changed from 15 to 28 kg m À3 . In addition, the in situ FTIR analysis was applied to analyze the imidization percentage of the foam during imidization process.

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The pyrolysis behaviors of polyimide foam derived from 3,3′,4,4′‐benzophenone tetracarboxylic dianhydride/4,4′‐oxydianiline

Cited by 28 publications

References 65 publications

Effects of 3,4′‐oxydianiline on the structures and properties of a novel aromatic polyimide foam

Effects of 3,4′‐oxydianiline on the structures and properties of a novel aromatic polyimide foam

Pyrolysis and hydrolysis behaviors during steam pyrolysis of polyimide

A novel vacuum-assisted method for fabricating flexible polyimide foams from 3,3′,4,4′-oxydiphthalic anhydride/4,4′-oxydianiline

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