Synthesis and properties of poly(urethane-imide) interpenetrating network membranes

Tsai, Mei‐Hui; Huang, Shih-Liang; Liu, Shu-Jhuan; Chen, Chiou-Jey; Chen, Pei-Jyun; Chen, Shih‐Hsiung

doi:10.1016/j.desal.2007.09.042

Cited by 29 publications

(11 citation statements)

References 25 publications

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“…The FTIR spectra of PIFs before and after postcure are presented in Fig. 2 (a) and (b) 16–18. Though the feed weight ratios of PAPI to the first solution were in the range of 0.50–1.10, the characteristic absorption peaks for PIFs before and after postcure are similar.…”

Section: Resultsmentioning

confidence: 92%

Preparation and performance of a novel polyimide foam

Liu

Zhan

Wang

et al. 2011

Polymers for Advanced Techs

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A new type of polyimide foam (PIF) was prepared and characterized based on a one-pot process by the reaction of a first solution with different ratios of a second solution. The first solution was comprised of pyromellitic dianhydride (PMDA), N, N-dimethyl formamide (DMF), methanol, water, surfactant, and catalysts, while the second solution contained polyaryl polymethylene isocyanate (PAPI). In the present study, the relationships among compositions, structures, and properties of PIFs were investigated. The results indicated that with the increase in the weight ratio of PAPI/(first solution), the foaming degrees of PIFs increased from 10.14 to 10.52 times and the apparent densities before postcure decreased from 15.96 to 14.51 kg/m 3 . The open cell contents, average sound absorption coefficients, and average cellular diameters of PIFs after postcure increased with increase in the weight ratio of PAPI/(first solution). The glass transition temperatures (T g ) of PIFs after postcure first increased from 287 to 299-C, then decreased to 292-C, and the 5% weight loss temperatures and 10% weight loss temperatures presented the same trend as well. The compressive and flatwise tensile properties scaled very well with the relative densities of the foams after postcure, with the highest compressive strength of 0.03 MPa and the highest flatwise tensile strength of 0.15 MPa.

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Section: Resultsmentioning

confidence: 92%

Preparation and performance of a novel polyimide foam

Liu

Zhan

Wang

et al. 2011

Polymers for Advanced Techs

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“…Furthermore, it is noteworthy that the compressive strength of PI‐2 improved compared with PI‐0 even though the density of PI‐2 is less than PI‐0. This reinforcement effect can be assigned to the fine dispersion and high orientation of chopped CF in the cell arrises that significantly improved the strength of cell skeletons, leading to a considerable portion of load transferred from the matrix to the chopped carbon fibers . On the other hand, the improved cell size distribution and density also play an important role in enhancing compressive strength of composite foams.…”

Section: Resultsmentioning

confidence: 99%

Preparation and properties of polyimide/chopped carbon fiber composite foams

Zhang

et al. 2016

Polymers for Advanced Techs

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In this study, a series of reinforced polyimide (PI)/carbon fiber (CF) composite foams were fabricated through thermal foaming of polyester ammonium salt (PEAS) precursor powders. The PEAS precursor powders containing different contents of chopped CF were synthesized from benzophenone‐3,3′,4,4′‐tetracarboxylic dianhydride (BTDA) and 4,4′‐diaminodiphenyl ether (ODA). The effects of different CF loadings on foaming behavior of PEAS/CF composite precursor powders, final cellular morphology, and physical properties of PI composite foams were investigated. The results revealed that the chopped CF acted as nucleation agent in the foaming process. The dispersion of CF can be evaluated using digital microscope. It is interesting to find that the chopped CF were highly oriented along the direction of cell arrises. As a result, the mechanical properties of PI foams were significantly enhanced owing to the incorporation of chopped CF. Furthermore, the thermal stability of PI composite foams were also slightly improved owing to fine dispersion of CF. In addition, the PI/CF composite foam shows uniform cell size distribution and the best comprehensive physical properties as chopped CF loading at around 6 wt%. Copyright © 2016 John Wiley & Sons, Ltd.

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“…It also possesses remarkable heat resistance and excellent mechanical, electrical and chemical and durability properties and has been widely applied in aerospace and microelectronic industries at elevated temperatures (11,12). Numerous studies have been carried out to understand their both chemical and physical properties and structures (13)(14)(15). Moreover, their thermal stabilities have been studied thus far (16,17).…”

Section: Introductionmentioning

confidence: 99%

Fluorescence, Thermal, Electrochemical, and Morphological Properties of New Poly(Urethane-İmide)s: Synthesis and Characterization

Avcı

Şirin

2014

Journal of Macromolecular Science, Part A

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New thermally stable poly(urethane-imide)s (PUIs) were synthesized to investigate aliphatic and aromatic group effects on various properties such as thermal stability and electrochemical properties. Thermal characterizations were carried out by TG-DTA and DSC techniques. TGA results showed that the PUIs derived from aromatic diisocyanates had relatively higher thermal stabilities as compared to the aliphatic diisocyanate. They have between 223-245 • C onset temperature and above 37% char at 1000 • C. Also, thermal degradation values show that PUIs have higher stability than conventional PU. DSC results showed that the new PUIs have Tg values between 134 and 138 • C. Fluorescence measurements were performed using dimethyl sulfoxide solutions and also, the optimization of the concentrations maximal emission intensity was investigated in dimethyl sulfoxide. As a result, the remarkable properties related to the fluorescence and thermal measurements of the polymers were obtained. Therefore, these polymers could be used in various application fields because of the fluorescent and thermal properties.

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Synthesis and properties of poly(urethane-imide) interpenetrating network membranes

Cited by 29 publications

References 25 publications

Preparation and performance of a novel polyimide foam

Preparation and performance of a novel polyimide foam

Preparation and properties of polyimide/chopped carbon fiber composite foams

Fluorescence, Thermal, Electrochemical, and Morphological Properties of New Poly(Urethane-İmide)s: Synthesis and Characterization

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