Synthesis, characterization, and thermal properties of poly(siloxane-carborane)s

Zhang, Xuechao; Kong, Linghong; Dai, Lina; Zhang, Xuezhong; Wang, Qian; Tan, Yuanyuan; Zhang, Zhijie

doi:10.1016/j.polymer.2011.08.038

Cited by 42 publications

(26 citation statements)

References 30 publications

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“…Polymers with carboranes as building blocks, such as polyurethanes, polythiophenyls, polysiloxanes, and polyimides, are getting some attention due to their good solubility, thermal and thermo‐oxidative stability, and high T g . For example, Huang et al.…”

Section: Methodsmentioning

confidence: 99%

HighT_gand Thermo‐Oxidatively Stable Thermosetting Polyimides Derived from a Carborane‐Containing Diamine

Gong

Chen

et al. 2018

Macromol. Rapid Commun.

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To provide high-temperature polyimide matrix resins, novel carborane-containing thermosetting polyimides are presented. First, the low-viscosity carborane-containing imide oligomers are synthesized using newly designed 1-(3-amino-4-tolyl)-2-(4-aminophenyl)-o-carborane and aromatic dianhydride as monomers, 4-phenylethynyl phthalic anhydride as the end-capping reagent. Followed by thermal curing, the resulting polyimides show high T (≥500 °C) and above 92.1% char yield at 800 °C both in nitrogen and air atmosphere due to the incorporation of the bulky carborane cages. Aging studies, performed at 400 and 500 °C for 5 h in air on a carborane-containing polyimide and a carborane-free polyimide, show that the polyimide with carborane groups possesses excellent thermo-oxidative stability. Moreover, the novel polyimides exhibit constant and relatively low coefficient of thermal expansion values over a wide range of temperature, indicative of a remarkable dimensional stability. Thus, this study clearly demonstrates the viability of the incorporation of carborane cages to access polyimide thermosets with ultrahigh T and thermo-oxidative stability.

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Section: Methodsmentioning

confidence: 99%

HighT_gand Thermo‐Oxidatively Stable Thermosetting Polyimides Derived from a Carborane‐Containing Diamine

Gong

Chen

et al. 2018

Macromol. Rapid Commun.

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“…Nuclear magnetic resonance ( 1 H, 13 C, and 29 Si NMR) was measured on a BRUKER AVANCE 500 instrument, using CDCl 3 as a solvent with tetramethylsilane (TMS) as the internal standard. The number average molecular weight (Mn) and weight average molecular weight (Mw) of PSOA were measured with gel permeation chromatograph (GPC) performed on a Waters 410 chromatograph (polystyrene standard; eluent: THF).…”

Section: Characterizationmentioning

confidence: 99%

“…As reported, these copolymers had potential as matrix materials for advanced composites, precursors to shaped ceramics, or as coatings (12). In 2011, alternating carborane-siloxane polymers with pendant methyl or vinyl were synthesized by the polycondensation of 1, 7-bis(dimethylhydroxylsilyl)-m-carborane and cyclotrisilazanes under the catalysis of (NH 4 ) 2 SO 4 (13). The polymers and thermosets had the superior thermal stability, with residue yields of over 83% both in air (800 C) and nitrogen (1000 C).…”

Section: Introductionmentioning

confidence: 99%

o-Carborane-Containing Poly(siloxane-arylacetylene)s With Thermal and Thermo-Oxidative Stabilities

Jiang

Huang

et al. 2015

Journal of Macromolecular Science, Part A

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A series of poly(siloxane-arylacetylene)s with o-carborane in the backbone (CB-PSOA)s were prepared by the coupling reaction between poly(siloxane-arylacetylene) (PSOA) and decaborane (B 10 H 14 ) in the presence of CH 3 CN. CB-PSOAs were characterized by Fourier-transform infrared (FT-IR) spectroscopy, nuclear magnetic resonance (NMR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and Pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS). The results show that the average amount of carborane units in a CB-PSOA chain could be raised when the molar ratio of B 10 H 14 to PSOA is increased from 0.6 to 2.4. The crosslinking reaction could be carried on at above 140 C for CB-PSOAs. The CB-PSOA thermosets show excellent thermo oxidative stability with over 85% residue yield at 1000 C in air.

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“…27 Bands at 1780 (asymmetric C]O stretching) and 1731 cm À1 (symmetric C]O stretching) correspond to the imide rings along polyimide main chain. 28 Adsorption bands at 2200 cm À1 are characteristic bands of alkyne, indicating the alkyne groups embedded in the polyimide chain are stable under polyimide synthesis and the subsequent drying process.…”

Section: Carborane Polyimide Synthesesmentioning

confidence: 99%

Carborane polyimides, synthesis and characterization

et al. 2014

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Here we report the syntheses of polyimides with meta-carborane cages embedded in the polymer chain and their characterizations. Aromatic carborane diamines were prepared by a Sonogashira reaction in the first place; reaction of the obtained diamines with commercially available dianhydride led to the formation of carborane polyimides with high molecular weight. Thermogravimetric analysis (TGA) of the samples showed that they have excellent thermal stability, with 5 wt% decomposition temperatures (T d5% ) higher than 520 C. Due to the boron-rich nature of the obtained polyimides, samples prepared here have potential applications in the aerospace industry and nuclear power stations as building blocks for neutron shielding and detecting devices.

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Synthesis, characterization, and thermal properties of poly(siloxane-carborane)s

Cited by 42 publications

References 30 publications

HighT_gand Thermo‐Oxidatively Stable Thermosetting Polyimides Derived from a Carborane‐Containing Diamine

HighT_gand Thermo‐Oxidatively Stable Thermosetting Polyimides Derived from a Carborane‐Containing Diamine

o-Carborane-Containing Poly(siloxane-arylacetylene)s With Thermal and Thermo-Oxidative Stabilities

Carborane polyimides, synthesis and characterization

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Synthesis, characterization, and thermal properties of poly(siloxane-carborane)s

Cited by 42 publications

References 30 publications

HighTgand Thermo‐Oxidatively Stable Thermosetting Polyimides Derived from a Carborane‐Containing Diamine

HighTgand Thermo‐Oxidatively Stable Thermosetting Polyimides Derived from a Carborane‐Containing Diamine

o-Carborane-Containing Poly(siloxane-arylacetylene)s With Thermal and Thermo-Oxidative Stabilities

Carborane polyimides, synthesis and characterization

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HighT_gand Thermo‐Oxidatively Stable Thermosetting Polyimides Derived from a Carborane‐Containing Diamine

HighT_gand Thermo‐Oxidatively Stable Thermosetting Polyimides Derived from a Carborane‐Containing Diamine