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

Sun, Gaohui; Wang, Wenpeng; Wang, Leichao; Yang, Zuodong; Liu, Lianhe; Wang, Jun; Ma, Ning; Wei, Hao; Han, Shihui

doi:10.1002/app.45041

Cited by 26 publications

(17 citation statements)

References 26 publications

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“…It can meet the requirements of heat insulation and combustion-resistant building materials for large-scale sports and entertainment venues, high-rise buildings, and high-speed vehicles. Polyimide (PI) foam, with high thermal insulation, great thermal stability, and high fire resistance, has broad prospects for application and development in the aerospace, aircraft, and marine fields [23,24,25,26,27,28].…”

Section: Introductionmentioning

confidence: 99%

Recent Trends of Foaming in Polymer Processing: A Review

et al. 2019

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Polymer foams have low density, good heat insulation, good sound insulation effects, high specific strength, and high corrosion resistance, and are widely used in civil and industrial applications. In this paper, the classification of polymer foams, principles of the foaming process, types of blowing agents, and raw materials of polymer foams are reviewed. The research progress of various foaming methods and the current problems and possible solutions are discussed in detail.

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Section: Introductionmentioning

confidence: 99%

Recent Trends of Foaming in Polymer Processing: A Review

et al. 2019

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“…Compared with ordinary plastics, it has lower density, smaller thermal conductivity and higher specific strength. Foam plastic also has the properties of absorbing impact loads, sound absorption, and heat insulation, and is widely used in many fields 3–6 …”

Section: Introductionmentioning

confidence: 99%

Effect ofDAPBOsegment on the structure and performance enhancement of powder foamedBTDA‐ODApolyimide

Liu

Liang

et al. 2020

J of Applied Polymer Sci

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Achieving excellent thermal stability, good mechanical strength, and low-density in one product, is a big challenge in the design and synthesis of polyimide (PI) foams. We selected a rigid diamine monomer, 2-(4-aminophenyl)-5-aminobenzoxazole (DAPBO) to partially replace 4,4 0-oxydianiline (ODA) in BTDA-ODA system, and studied the effect on properties of foamed PI products. With various molar ratio between DABPO and ODA (0:5, 1:4, 2:3, 3:2, 4:1, 5:0), the diamine(s) polymerized with 3,3 0 ,4,4 0-benzophenonetetracarboxylic dianhydride (BTDA) and produced six PI precursors (PAE-0~PAE-5). After foaming and thermal imidization, corresponding PI foams (PI-0~PI-5) prepared. Among them, PI-3 has a glass transition temperature of 386 C, which is 95 C higher than PI-0, and its compressive strength reaches 1.32 MPa. Moreover, PI-3 has a uniform cell structure with an average pore size of~200 μm. The analysis results show that PI-3 is in a transition state from amorphous to partial crystalline, maintaining a balance between flexibility and rigidity. The addition of DABPO not only increases the rigidity of polymer molecular segments, but also introduces N and O atoms that can form intermolecular hydrogen bonds between molecules, which increases the packing density and arrangement regularity of polymer molecules. K E Y W O R D S DABPO, enhanced thermal stability, high mechanical strength, polyimide foam, powder foaming 1 | INTRODUCTION Foam plastic is a plastic with a large number of micropores manufactured by a foaming process. 1,2 Compared with ordinary plastics, it has lower density, smaller thermal conductivity and higher specific strength. Foam plastic also has the properties of absorbing impact loads, sound absorption, and heat insulation, and is widely used in many fields. 3-6 Polyimide (PI) is a family of polymers with the best overall evaluation among engineering plastics, possessing good thermal stability, insulation, and mechanical properties. 7-12 Monsanto and DuPont conducted the earliest research on PI foam in 1960s. 13 Subsequently, National Aeronautics and Space Administration (NASA) Langley Research Center and Unitika America collaborated on the research of PI foams and promote their commercialization. After foaming, the density of PI can be reduced by more than 90%, meanwhile its glass transition temperature (T g) increases, and thermal conductivity decreases significantly. 14-19 The reduction of weight and increase of strength are the eternal theme of material development, especially in

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“…The specific strength [ 1 , 2 , 3 , 4 , 5 ] and dimensional stability of foaming materials [ 6 ] are directly related to cell density, which is determined by the number of cells present during the foaming process. Therefore, the quality of foaming materials can be effectively improved by regulating nucleation in the foaming process [ 7 , 8 , 9 , 10 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Organic Cage Nucleating Agent Structure on Nucleating Efficiency and the Structure-Property Relationship

Zhou

Gong

2020

Polymers

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Three types of organic cage compounds, namely, cucurbit[6]uril (Q[6]), hemicucurbit[6]uril (HQ[6]), and β-cyclodextrin (BC), with different cavity structures as heterogeneous nucleation agents were selected for a polypropylene (PP) foaming injection molding process. The experimental results showed that Q[6] with a “natural” cavity structure possessed the best nucleation efficiency of these three cage compounds. The nucleation mechanism of organic cage compounds was explored through classical nucleation theory, molecular structure, and in situ visual injection molding analysis.

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

Cited by 26 publications

References 26 publications

Recent Trends of Foaming in Polymer Processing: A Review

Recent Trends of Foaming in Polymer Processing: A Review

Effect ofDAPBOsegment on the structure and performance enhancement of powder foamedBTDA‐ODApolyimide

Effect of Organic Cage Nucleating Agent Structure on Nucleating Efficiency and the Structure-Property Relationship

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