Synthesis and Characterization of Some Bismaleimides Containing Ether Groups in the Backbone

Sava, M.; Găină, Constantin; Gaina, Viorica; Ţîmpu, Daniel

doi:10.1002/1521-3935(20010801)202:12<2601::aid-macp2601>3.0.co;2-y

Cited by 14 publications

(5 citation statements)

References 8 publications

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“…The flexural strength of cured resin is high, which could be possibly attributed to irregular substituted aromatic ether structure and conjugated naphthalene rings. 22,23 In addition, the storage modulus of m -PPNSA-MM-C first decreased and then increased due to mobilities of chains and thermal crosslinking reactions at a high temperature in Figure 7. The loss factor (tan δ) of m -PPNSA-MM-C is low below 0.16 in the range of 50–400°C, which illustrates that the cured resin has no glass transition below 400°C.…”

Section: Resultsmentioning

confidence: 97%

A high-performance silicon-containing arylacetylene resin with conjugated naphthalene rings

Liu

et al. 2021

High Performance Polymers

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2,7-Diphenyloxynaphthalene with large conjugated structure has been introduced into the main chain of silicon-containing arylacetylene resin and then poly(dimethylsilylene-ethynylenephenoxynaphthyloxyphenylene-ethynylene) ( m-PPNSA-MM) was synthesized. The m-PPNSA-MM resin shows good solubility and a wide processing window. A stable three-dimensional cross-linking network formed due to thermal crosslinking reactions of acetylene groups and intermolecular π–π stacking interactions after m-PPNSA-MM was cured through the process of 180°C/2 h + 220°C/2 h + 260°C/4 h. The flexural strength and modulus of the cured m-PPNSA-MM resin at room temperature are 49.2 MPa and 2.75 GPa, respectively. The cured m-PPNSA-MM resin show high thermal stabilities, the 5% temperature of weight loss ( Td5) reaches 560°C in nitrogen.

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Section: Resultsmentioning

confidence: 97%

A high-performance silicon-containing arylacetylene resin with conjugated naphthalene rings

Liu

et al. 2021

High Performance Polymers

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“…FTIR was employed on uncured (Figure a) as well as on the cured specimens (Figures e–g) of both Melt and HSSM BMI. Major groups and the peak positions associated with their respective infrared vibration modes ,,− are listed in Table S5. All curves were normalized to the intensity of the CC peak at 1509 cm –1 .…”

Section: Resultsmentioning

confidence: 99%

“…Hence, Raman spectroscopy was undertaken to further investigate the chemical structure of both the uncured (Figures b,c) and cured (Figures h–j) forms of the Melt and HSSM BMI. The major Raman peaks observed and their assignments ,− are listed in Table S5. All curves were normalized to the intensity of the CC peak (1603–1607 cm –1 ).…”

Section: Resultsmentioning

confidence: 99%

Learning from Nature: Molecular Rearrangement in the Bismaleimide System Leading to Dramatic Increase in Impact Strength

Kirmani

Gulgunje

Ramachandran

et al. 2020

ACS Appl. Polym. Mater.

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Materials in nature such as nacre that are made of mechanically inferior building blocks exhibit extreme toughness at the macro scale because of the geometry and arrangement of their constituents. Taking a cue from these systems, we have investigated whether the molecular rearrangement in a heterogeneous polymeric system can alter toughness at the macro scale. To this end, a multicomponent bismaleimide system is employed and processed by using (a) a melt and cast (termed Melt) approach and (b) a dual asymmetric centrifuge based high-speed shear mixing (termed HSSM) approach to enforce molecular rearrangement. Cured HSSM BMI exhibited an extraordinary increase of 393% in impact strength compared to the cured Melt BMI (an increase from 14 ± 6 to 69 ± 13 kJ/m2), without high shear mixing. Prior studies in the literature have reported a maximum impact strength of only 19 kJ/m2 for any BMI system. FTIR, Raman, and NMR spectroscopies provide evidence of molecular rearrangement upon HSSM processing. This molecular rearrangement also enhances the glass transition temperature in cured HSSM BMI by 16 °C compared to the cured Melt BMI. Small-angle X-ray scattering shows electron density heterogeneity at the scale of ∼16 nm in cured HSSM BMI. A direct relationship between the domain size calculated from the SAXS peak position, its intensity, and the impact strength is observed. Fractographs of cured HSSM BMI show unique, near-spherical micronodular features of ∼10–20 μm diameter, not observed in cured Melt BMI specimens. This study provides a pathway for designing and manufacturing of materials with extreme fracture toughness.

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“…However, related works the synthesis of asymmetric BMI monomers are still in their infancy. At the same time, an effective approach to improve mechanical properties in cured BMIs is the incorporation of more flexible linkages into the network structure and increase the distance between the two functional end groups .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of asymmetric bismaleimide oligomers with improved processability and thermal/mechanical properties

Yang

Pan

et al. 2019

Polymer Engineering & Sci

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Novel asymmetric bismaleimide (BMI) oligomers with different molecular weights and dianhydrides were designed and synthesized by 3,4′‐oxydianiline (3,4′‐ODA), 2,3,3′,4′‐oxydiphthalic dianhydride (a‐ODPA), and 2,3,3′,4′‐biphenyltetracarboxylic dianhydride (a‐BPDA). The chemical structures of BMI oligomers were confirmed by Fourier transform infrared spectrometry (FTIR) and gel permeation chromatography (GPC). X‐ray diffraction (XRD) exhibited broad peaks, suggesting amorphous structures. Heat flow curves of oligomers measured by differential scanning calorimeter (DSC) displayed wide processing window due to low glass transition temperatures (Tg). BMI oligomers exhibited high solubility in common organic solvents. Particularly, the OD‐BMI‐1 oligomer exhibited excellent solubility of more than 50 wt% in DMAc solvent. Tg value and minimum complex viscosity of OD‐BMI‐1 oligomer were only 121 °C and 8.1 Pa · s, respectively. The cured BMI resins possess high thermal and thermal‐oxidative stability. The Tg and the temperature of 5% weight loss in nitrogen were above 256 and 449 °C, respectively, and the residual weight percentages at 800 °C were all >49%. Moreover, films made of BMI resins exhibited excellent mechanical properties flexibility, as confirmed by photograph and DMA results of films. The elongation at break of the prepared films was found to be high (almost >9.6%). POLYM. ENG. SCI., 59:2265–2272, 2019. © 2019 Society of Plastics Engineers

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Synthesis and Characterization of Some Bismaleimides Containing Ether Groups in the Backbone

Cited by 14 publications

References 8 publications

A high-performance silicon-containing arylacetylene resin with conjugated naphthalene rings

A high-performance silicon-containing arylacetylene resin with conjugated naphthalene rings

Learning from Nature: Molecular Rearrangement in the Bismaleimide System Leading to Dramatic Increase in Impact Strength

Synthesis and characterization of asymmetric bismaleimide oligomers with improved processability and thermal/mechanical properties

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