Structure to properties relations of BPDA and PMDA backbone hybrid diamine polyimide aerogels

Mosanenzadeh, Shahriar Ghaffari; Saadatnia, Zia; SHI, FENG Y.; Park, Chul; Naguib, Hani E.

doi:10.1016/j.polymer.2019.05.050

Cited by 60 publications

(51 citation statements)

References 36 publications

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“…Among the fabricated single backbone aerogels only the S1 presented two varying slopes of decomposition, one started at about 413 °C and the second one started at about 624 °C. [24,43,44] As presented in Figure 6A, all three fabricated double backbone aerogels present similar onset of decomposition (T d ) and degradation trend at above 560 °C, which was close to the onset of decomposition of the ODA-BPDA (S5) aerogels. However, the TGA trend of the double backbone aerogels was slightly different at below their decomposition temperature.…”

Section: Thermal Propertiessupporting

confidence: 62%

“…The effective thermal conductivity and mechanical properties of aerogels has a sensitive and direct relations with aerogels density as well as nanostructure assembly. [13,19,24] So, with respect to the goal of this work to achieve high thermally insulated polyimide aerogels with reduced density and lower weight, the processing parameters were tailored to achieve double backbone aerogels made from low shrinkage PPDA-PMDA and ODA-BPDA oligomers instead of the denser PPDA-BPDA or ODA-PMDA ones. Furthermore, to examine the role of the processing arrangement on aerogels nanostructure assembly as well as the properties, combining of the two diverse oligomers was designed through three varying processing arrangements.…”

Section: Methodsmentioning

confidence: 99%

“…Among those, only the PPDA–PMDA was required to have diamine over dianhydride molar ratio of 1.9 to achieve a solid stable gel structure after imidization, while the rest were able to gel at diamine over dianhydride molar fraction of about one. [ 24 ] Between the four possible combinations of selected monomers, the PPDA–BPDA and ODA–PMDA aerogels presented high shrinkage of more than 30%, while the PPDA–PMDA and ODA–BPDA presented lower shrinkage of less than 10%.…”

Section: Methodsmentioning

confidence: 99%

“…The PPDA–PMDA sol–gels required the diamine over dianhydride molar ratio of about two to be able to hold their structure at the processing stages. [ 24 ] Also, at monomers ratio of 1.9 the PPDA–PMDA aerogel was able to retain its structure even without addition of any crosslinking agent. This suggested the need to study and analyze the double backbone aerogels with respect to self‐crosslinked PPDA–PMDA (S1 (no BTC) ) aerogel as well.…”

Section: Methodsmentioning

confidence: 99%

“…Based on the particulate cluster morphology of the S3 sample ( Figure 4H), and its similar shrinkage trend to S1, relatively higher shrinkage of the S3 samples was due to the more dominant role of the PPDA-PMDA oligomers in formation of the aerogel nanostructure assembly and as a result shorter chain length between the crosslinks and a higher number of crosslinks. [24] Compared to S3 aerogels, the fibrous morphology of S4 and S2 resulted in reduced shrinkage. However, compared to the S2 aerogels with long fibrous nanostructure assembly, the S4 samples with shorter fibers and a greater number of crosslinks presented better resistance against shrinkage.…”

Section: Shrinkage Density and Porosity Verificationmentioning

confidence: 97%

See 4 more Smart Citations

Double Dianhydride Backbone Polyimide Aerogels with Enhanced Thermal Insulation for High‐Temperature Applications

Mosanenzadeh

Alshrah

Saadatnia

et al. 2020

Macro Materials & Eng

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Aerogels owe their high thermal insulation and other unique properties to their nanostructure configuration. However, controlling the aerogels' morphology is always a scientific challenge. In this study, double dianhydride backbone (double backbone) polyimide aerogels with tailored nanostructure assembly are created for the first time. This is achieved by controlled polymerization reaction of oligomers with distinct dianhydride monomers. Combining the two oligomers through a controlled polymerization reaction is a successful strategy for tailoring the aerogels nanostructure assembly as well as other properties. The fabricated double backbone aerogel presents 40% reduced thermal conductivity of 19.7 mW mK−1 over previously studied polyimide aerogels along with the compression modulus of 1.64 MPa at a relatively low density of 0.068 g cm−3. Such low thermal conductivity is comparable with the inorganic counterparts. Light in weight and high thermally insulated polyimide aerogels with suitable mechanical properties and high service temperature are an appropriate replacement for current fireproof insulation materials.

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Section: Thermal Propertiessupporting

confidence: 62%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Shrinkage Density and Porosity Verificationmentioning

confidence: 97%

See 3 more Smart Citations

Double Dianhydride Backbone Polyimide Aerogels with Enhanced Thermal Insulation for High‐Temperature Applications

Mosanenzadeh

Alshrah

Saadatnia

et al. 2020

Macro Materials & Eng

Self Cite

View full text Add to dashboard Cite

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Mechanically Strengthened Aerogels through Multiscale, Multicompositional, and Multidimensional Approaches: A Review

Parale,

Kim,

Choi

et al. 2024

Advanced Materials

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In recent decades, aerogels have attracted tremendous attention in academia and industries as a lightweight and porous multifunctional nanomaterial. Despite their wide application range, their limited mechanical durability hinders their processing and operation, particularly in application requiring complex physical structures. “Mechanically strengthened aerogels” have emerged as the potential solution to address this drawback. Since the first report on aerogels in 1931, various modified synthesis processes have been introduced to enhance the mechanical strength of aerogels in the last decade, further advancing their multifunctional scope. This review summarizes the state‐of‐the‐art developments of mechanically strengthened aerogels through multicompositional and multidimensional approaches in the past 10 years. Additionally, new trends and future technologies for the commercialization of aerogels as much as plastic is discussed in the final section.This article is protected by copyright. All rights reserved

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Construction of fluorenyl‐modified low dielectric constant polyimide films with excellent mechanical properties and optical transparency

Xie,

Li,

Zhao

et al. 2024

J of Applied Polymer Sci

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In order to meet the requirements of highly integrated and miniaturized electronic components, there is an urgent need for low dielectric materials with high mechanical properties and optical transparency in the field of microelectronics. In this study, a series of novel polyimide films (FPI) containing fluorenyl were prepared, and the effects of the fluorenyl content on the thermal, mechanical, and dielectric properties of the copolymerized films were investigated and discussed. The results demonstrate a significant decrease in the dielectric constant of the FPI films following the introduction of fluorenyl into polyimide (PI) chain segment. The FPI films also exhibited high mechanical properties, including tensile strengths between 92 and 106 MPa and elongation at break in the range of 8.4%–13.0%. Additionally, the introduction of the noncoplanar fluorenyl considerably improved the optical transparency and solubility of the FPI film. It is noteworthy that the FPI‐3 has the best dielectric properties, with a low dielectric constant of 2.61 at 10 MHz and shows low water absorption (0.49%). The results show that we have prepared a novel low dielectric PI material film with excellent mechanical properties and optical transparency by introducing fluorenyl into the PI chain segment. These FPI films with satisfactory properties may be good candidates for dielectric materials for electronic components.

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Structure to properties relations of BPDA and PMDA backbone hybrid diamine polyimide aerogels

Cited by 60 publications

References 36 publications

Double Dianhydride Backbone Polyimide Aerogels with Enhanced Thermal Insulation for High‐Temperature Applications

Double Dianhydride Backbone Polyimide Aerogels with Enhanced Thermal Insulation for High‐Temperature Applications

Mechanically Strengthened Aerogels through Multiscale, Multicompositional, and Multidimensional Approaches: A Review

Construction of fluorenyl‐modified low dielectric constant polyimide films with excellent mechanical properties and optical transparency

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