Effects of 4,4′‐diaminodiphenyl ether on the structures and properties of isocyanate‐based polyimide foams

Yao, Yao; Zhang, Guangcheng; Li, Jianwei; Wang, Aifeng; Shi, Xuetao

doi:10.1002/app.46029

Cited by 32 publications

(24 citation statements)

References 22 publications

(19 reference statements)

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“…While PAA showed three steps weight loss behavior that was as 10% until 164 °C, 40% until 560 °C and 65% until 800 °C, PI has shown one degradation step starting at about 560 °C and weight loss 40%. This result indicates that the PI structure is very stable until 560°C and has very high char amount …”

Section: Resultsmentioning

confidence: 80%

Polyimide‐coated fabrics with multifunctional properties: Flame retardant, UV protective, and water proof

Hiçyilmaz

Altın

Bedeloğlu

2019

J of Applied Polymer Sci

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Multifunctional technical textiles are of great interest both by industry and academia and these products are considered as high value-added products that contribute to the economies of countries. In this study, polyamic acid (PAA) was synthesized through polycondensation of pyromellitic dianhydride (PMDA) and 4,4 0 -oxydianiline (ODA) in dimethyl acetamide (DMAc) at low temperature. Then, PAA was coated onto woven cotton and polyester fabric by padding technique. Finally, polyimide (PI)-coated multifunctional cotton and polyester fabrics were obtained by an easy coating technique and low-temperature imidization. Thus, low cost, easily accessible and widely used cotton and polyester fabrics were converted to high-performance textile products, which are flame retardant, UV protective, acid resistant, and waterproof. The chemical, thermal, morphological, optical, mechanical, wettability, chemical resistance, and flame retardancy properties of developed fabrics were investigated. Optical results showed that both PI-coated cotton and polyester fabrics are UV-A protective compared to noncoated fabrics. Moreover, PI-coated samples have high contact angles which are 111.43 and 113.40 for PI-coated cotton (PI-c-C) and PI-coated polyester (PI-c-PET), respectively. Young's modulus of PI-c-PET fabrics increased four times more than noncoated polyester fabric. PI coating changed the burning behavior of both cotton and polyester fabrics in a positive way. All the test results showed that these developed multifunctional textile products might find an application in different industrial areas such as automotive, aerospace, protective clothing, and so on due to easy and inexpensive production techniques and also superior properties.

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Section: Resultsmentioning

confidence: 80%

Polyimide‐coated fabrics with multifunctional properties: Flame retardant, UV protective, and water proof

Hiçyilmaz

Altın

Bedeloğlu

2019

J of Applied Polymer Sci

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“…The methods for preparing PI foams include polyamic acid foaming, polyester ammonium salt precursor foaming, microsphere foaming and isocyanate-based foaming method [36]. The isocyanate-based foaming method is simple and easily implemented since it uses carbon dioxide that produced in situ as the foaming agent [37,38].…”

Section: -Bonded Carbonmentioning

confidence: 99%

Carbonization of Graphene-Doped Isocyanate-Based Polyimide Foams to Achieve Carbon Foams with Excellent Electromagnetic Interference Shielding Performance

et al. 2021

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Lightweight carbon foams with excellent electromagnetic interference (EMI) shielding performance were prepared by carbonization process, using isocyanate-based polyimide foams as carbon precursors. The influence of carbonization temperature and graphene-doping on the morphological, electrical and EMI shielding effectiveness (SE) of corresponding carbon foams was studied in detail. Results showed that the addition of graphene was beneficial to the improvement of electrical conductivity and EMI shielding performance of carbon foams. The electrical conductivity of carbon foams increased with the carbonization temperature which was related to the increase of graphitization degree. Collapse of foam cells was observed at higher carbonization temperatures, which was detrimental to the overall EMI SE. The optimal carbonization temperature was found at 1100 °C and the carbon foams obtained from 0.5 wt% graphene-doped foams exhibited a specific EMI SE of 2886 dB/(g/cm3), which shows potential applications in fields such as aerospace, aeronautics and electronics.

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“…The respective preparation methods are one-pot method and two-step polyester-amine salt (PEAS) precursor powders foaming method, respectively. 8,9 Although the preparation process of isocyanate-based PI is simple, however, the isocyanate-based PI foam contains polyurethane segment and tends to form polyurea, which significantly reduces the heat resistance and flame retardancy of the PI foams. Additionally, the current industrialized and commercial PI foams are mainly soft isocyanate-based PI foams that just can be used for shock absorption and sound insulation.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of rigid polyimide foams with overall enhancement of thermal and mechanical properties

Ding

et al. 2020

Journal of Cellular Plastics

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Polyimide (PI) foams have been developed for decades and widely used as thermal insulation materials. However, the limited mechanical and thermal properties continually being a serious problem that restrict their further applications. In this study, a series of rigid PI foams with excellent mechanical and thermal performance were fabricated by the reaction of benzophenone-3,3',4,4'-tetracarboxylic dianhydride (BTDA) with two diamines of 2–(4-aminophenyl)-5-aminobenzimidazole (BIA) and 4,4'-diaminodiphenyl ether (ODA) with various molar ratios, and the cis-5-norbornene-endo-2,3-dicarbox-ylic acid (NA) was introduced as end-capping and foaming agent. The results demonstrate that the foaming degree decreases with increasing the BIA molar ratio in the polymer chains owing to the elevated melt viscosity of precursor. Furthermore, the prepared rigid PI foams exhibit excellent thermal and mechanical properties. When the BIA contend up to 40 mol%, the glass transition temperature ( Tg) and the temperature at 10% of weight loss ( Td 10 %) of PI foam increased ∼80°C and ∼35°C in comparison with the pristine PI-0, respectively. In addition, the compressive strength and modulus at 10% strain of PI-4 reached to 5.48 MPa and 23.8 MPa, respectively. For the above-mentioned advantages, the prepared rigid PI foams are promising candidates as thermal insulation and structure support composite materials in the aerospace and aviation industries.

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Effects of 4,4′‐diaminodiphenyl ether on the structures and properties of isocyanate‐based polyimide foams

Cited by 32 publications

References 22 publications

Polyimide‐coated fabrics with multifunctional properties: Flame retardant, UV protective, and water proof

Polyimide‐coated fabrics with multifunctional properties: Flame retardant, UV protective, and water proof

Carbonization of Graphene-Doped Isocyanate-Based Polyimide Foams to Achieve Carbon Foams with Excellent Electromagnetic Interference Shielding Performance

Fabrication of rigid polyimide foams with overall enhancement of thermal and mechanical properties

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