Graphene Oxide: A Versatile Agent for Polyimide Foams with Improved Foaming Capability and Enhanced Flexibility

Xu, Linli; Jiang, Shidong; Li, Baopeng; Hou, Wenpeng; Li, Guoxing; Memon, Mushtaque A.; Huang, Yong; Geng, Jianxin

doi:10.1021/acs.chemmater.5b00981

Cited by 73 publications

(62 citation statements)

References 46 publications

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“…[3][4][5][6][7][8] There are mainly two strategies improving the mechanical properties of polyimide foams by PEAS precursor powders foaming method. [3][4][5][6][7][8] There are mainly two strategies improving the mechanical properties of polyimide foams by PEAS precursor powders foaming method.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and properties of polyimide foams containing benzimidazole units

Zhang

Yao

et al. 2016

RSC Adv.

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In this research paper, a series of novel polyimide (PI) foams containing benzimidazole units were prepared derived from polyester ammonium salt (PEAS) precursor powders, which were synthesized by copolymerization of benzophenone-3,3 0 ,4,4 0 -tetracarboxylic dianhydride (BTDA) with two diamines of 2-(4-aminophenyl)-5-aminobenzimidazole (BIA) and 4,4 0 -diaminodiphenyl ether (ODA) with various molar ratios. The effects of incorporation of BIA on the morphology, thermal and mechanical properties of copolyimide (co-PI) foams were explored. The results show that the BIA has a significant influence on foaming degree of PEAS precursor powders. The density of co-polyimide foams increases with increasing the BIA content in the polymer chains. Moreover, the thermal stability of the resultant copolyimide foams presents a remarkable upward trend with incorporating more BIA units into the polymer chains. As the BIA loading up to 30 mol%, the glass transition temperature of co-polyimide foams increases around 50 C in comparison with the pristine polyimide foam. Furthermore, the compressive strength of the co-polyimide foams is in the range of 0.30-0.75 MPa, which is superior to their of commercial polyimide foams with the same density. The co-polyimide foams with higher thermal and mechanical properties expand their potential application in many high-tech fields such as aerospace and aviation industries.a The viscosity of the PEAS precursor solution, measured using digital rotational viscometer at room temperature. This journal is

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Section: Introductionmentioning

confidence: 99%

Synthesis and properties of polyimide foams containing benzimidazole units

Zhang

Yao

et al. 2016

RSC Adv.

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“…Xu et al 30 grafted graphene oxide nanosheets onto poly (amic ester) (PAE); after foaming and thermal imidization a PI/GO foam was obtained (T g 248.6 C). The addition of graphene oxide (GO) nanosheets improved the foaming rate of PI reducing the product density by 50% to 0.075 g/cm 3 and increased the bending strength by 22.5%.…”

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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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“…These properties show its broad application prospects. However, PI is difficult for continuous industrial production because of its complex preparation and high manufacturing costs …”

Section: Introductionmentioning

confidence: 99%

Improved mechanical, thermal, and flame‐resistant properties of polyurethane–imide foams via expandable graphite modification

Yao

Tian

et al. 2018

J of Applied Polymer Sci

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Although polyurethane–imide (PUI) foams combine the advantages of both polyurethane foam and polyimide foam, the performance of PUI might still not reach certain high‐level requirements. Thus, expandable graphite (EG), as a kind of effective reinforcing filler, was introduced into the PUI matrix to improve the physical properties of the foam. Furthermore, to enhance the interfacial compatibility, EG was surface‐modified with a silane coupling agent. The experimental results show that the addition of EG was beneficial for enhancing the comprehensive performance of the PUI foams, especially their thermal stability and flame resistance. In particular, the surface‐modified, EG‐filled PUI foam exhibited outstanding enhancements compared to that with only pristine EG incorporation; not only the compressive strength but also the thermal degradation properties were greatly enhanced by the increased interfacial compatibility between PUI and EG. In addition, the flame‐resistant properties were improved by the surface modification of EG. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 46990.

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Graphene Oxide: A Versatile Agent for Polyimide Foams with Improved Foaming Capability and Enhanced Flexibility

Cited by 73 publications

References 46 publications

Synthesis and properties of polyimide foams containing benzimidazole units

Synthesis and properties of polyimide foams containing benzimidazole units

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

Improved mechanical, thermal, and flame‐resistant properties of polyurethane–imide foams via expandable graphite modification

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