The effects of concentration dilution of cross-linkable diacetylenes on the plasticity of poly(m-carborane-disiloxane-diacetylene)s

Kolel-Veetil, Manoj K.; Keller, Teddy M.

doi:10.1039/b303751g

Cited by 27 publications

(24 citation statements)

References 10 publications

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“…These polymers were prepared by the ferric chloride-catalyzed copolymerization of dichloro and dimethoxy-terminated monomers. [2][3][4][5][6] On the basis of poly(carborane-siloxane), recently, Henderson and Keller 7,8 have reported the synthesis of poly(carborane-siloxane-diacetylene). Incorporation of acetylenic groups into the poly(carborane-siloxane) backbone provides many advantages.…”

Section: Introductionmentioning

confidence: 99%

Novel phenyl acetylene terminated poly(carborane‐silane): Synthesis, characterization, and thermal property

Zhou

Mao

et al. 2007

J of Applied Polymer Sci

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Phenyl acetylene terminated poly(carborane-silanec) (PACS) was synthesized by the couple reaction of methyldichlorosilane with 1,7-dilithio-m-carborane and lithium phenylacetylide. The structure was characterized using FTIR,Si-NMR, and gel permeation chromatography. PACS exhibits solubility in common organic solvents. Thermal and oxidative properties were evaluated by thermogravimetric analysis (TGA). Thermoset exhibits extremely thermal and oxidative property and TGA curves show that the temperature of 5% weight loss (Td 5 ) is 7628C and char yield at 8008C is 94.2% in nitrogen. In air, surprisingly, both Td 5 and char yield at 8008C show slight increase, which is greater than 8008C and 95.6%, respectively. After pyrolysis, the char has no additional weight loss up to 8008C in air.

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Section: Introductionmentioning

confidence: 99%

Novel phenyl acetylene terminated poly(carborane‐silane): Synthesis, characterization, and thermal property

Zhou

Mao

et al. 2007

J of Applied Polymer Sci

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“…14,15 Recently, several investigations have been conducted on polymers containing siloxane and acetylene units. [16][17][18][19][20][21][22][23][24] For example, Keller 17 and coworkers reported the preparation of linear siloxane-diacetylene polymers by reacting dichlorosiloxanes with dilithiodiacetylene. These linear silxoane-diacetylene polymers show excellent thermal and thermooxidative stabilities.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of Arylacetylene Resins with Siloxane Units

Gao¹,

Zhang²,

Tang³

et al. 2010

Bulletin of the Korean Chemical Society

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A series of arylacetylene resins with siloxane units were synthesized by the condensation reactions of m-diethynylbenzene magnesium reagents with various α,ω-bis(chloro)dimethylsiloxanes. These resins are liquids and are miscible with common organic solvents at room temperature. The structures of the resins were characterized by FT-IR, 1 H NMR, 13 C NMR, 29 Si NMR, and gel permeation chromatography (GPC). The thermal behaviors of the resins were examined with differential scanning calorimetry (DSC). These resins have good processability. They can be thermally crosslinked through the ethynyl groups to produce cured resins. The thermal and thermooxidative stabilities of the cured resins were studied by thermogravimetric analysis (TGA). The cured resins possess high thermal and thermooxidative stability. Their decomposition occurs at above 500 o C in both N2 and air. With increasing the length of siloxane units in the resins, the thermal stability of the cured resins decreases in N2. When the cured resins were sintered above 1450 o C under argon, hard and glassy SiOC ceramics were obtained. These SiOC ceramics have the decomposition temperatures at 5% weight loss above 800 o C in air.

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“…1,1,3,3,5,5,7,7-Octamethyltetrasiloxane was used as received from Gelest. The metal catalysts, tantalum(V) chloride (TaCl 5 , 99.99%), tungsten hexacarbonyl (W(CO) 6 , 99.9+%), and chloro(l,5-cyclooctadiene)rhodium(I) dimer (Rh 2 (^i-C1) 2 (C0D) 2 , 98%) were used as received from Aldrich. (Cp) 2 Ta=CH(CMe) 3 Cl was synthesized following a published procedure (8).…”

Section: Methodsmentioning

confidence: 99%

“…The crosslinked materials were observed to have high weight retention on thermal treatment to 1000°C in both N 2 and air (weight retention in N 2 = 87% and in air = 92%) and consequently were found to possess exceptional ceramic characteristics, thereby allowing their applications as both high temperature plastics and ceramics. Subsequent research to produce high temperature elastomeric versions of these materials resulted in the recent development of crosslinked network carboranylenesiloxane systems by the manipulation of the crosslinking density in 1 (6). A reduction in the crosslinking density in 1 by the lowering of the concentration of constituent diacetylene units yielded products with decreased Thermally-crosslinked PCSA network glass transition temperatures.…”

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confidence: 98%

“…Hence, in an attempt to make these systems more amenable to applications at ambient conditions, four avenues were explored that required much milder conditions for the curing of diacetylenes. The explored avenues included the curing of the diacetylenes in 1 by UV irradiation, TaCl 5 -catalyzed polymerization, W(CO) 6 -catalyzed photo polymerization and Rh 2 (|Li-Cl)2(COD)2-catalyzed hydrosilation reaction. The preliminary results of the studies are reported.…”

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confidence: 99%

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Alternatives to Thermal Curing in Diacetylene-Containing Carboranylenesiloxanes

Kolel-Veetil

Keller

2005

ACS Symposium Series

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The dilutions in crosslinking density in the thermally and thermo-oxidatively stable, diacetylene-containing inorganic--organic hybrid oligomers of poly(carboranylenesiloxanes) have resulted in rendering the network polymers derived from them elastomeric in nature. While the crosslinking reactions of the diacetylenes require high temperatures and protracted curing times, avenues of diacetylene-curing with less demanding conditions should add to the possibilities of their potential applications. Several alternative avenues for the curing of the diacetylenes have been explored and the preliminary results are reported. 366

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The effects of concentration dilution of cross-linkable diacetylenes on the plasticity of poly(m-carborane-disiloxane-diacetylene)s

Cited by 27 publications

References 10 publications

Novel phenyl acetylene terminated poly(carborane‐silane): Synthesis, characterization, and thermal property

Novel phenyl acetylene terminated poly(carborane‐silane): Synthesis, characterization, and thermal property

Synthesis and Properties of Arylacetylene Resins with Siloxane Units

Alternatives to Thermal Curing in Diacetylene-Containing Carboranylenesiloxanes

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