Method for preparing poly-carboranylenesiloxane polymers
Abstract
Abstract THIS INVENTION RELATES TO THE METHOD FOR THE PREPARATION OF LINEAR PLY-META(-M-) AND PARA (-P-) CARBORANYLENESILOXANES BY THE CONTROLLED HYDROLYTIC CONDENSATION OF SELECTED SILICON-CONTAING CARBORANES. FOR EXAMPLE, 1.473 MOLES OF H2O IN 400 ML. TETRAHYDROFURAN WAS ADDED OVER A PERIOD OF 30 MINUTES TO A FLASK COOLED WITH AN ICE-BATH AND CONTAINING 1.052 MOLES OF BIS(1,1,3,3 - TETRAMETHYL - 3 - CHLORODISILOXANE) - MCARBORANE AND 2100 MOL. OF DIETHYL ETHER. STIRRING WAS CONTINUED FOR ANOTHER 30 MINUTES; THE FLASK WAS WARMED TO 25* C. AND AFTER 21/2 HOURS, THE SOLVENTS WERE STRIPPED UNDER REDUCED PRESSURE. AFTER REMOVING THE LAST TRACES OF SOLVENT THE POLYMER OBTAINED HAD A NUMBER AVERAGE MOLECULAR WEIGHT OF 10,000. THE POLYMERS OBTAINED BY THE CONTROLLED HYDROLYTIC CONDENSATION HAVE UTILITY AS HIHG TEMPERATURE LIQUIDS AND COATINGS, GASKETS. O-RINGS, ENCAPSULATION MATERIALS, HEAT RESISTANT ADHESIVES AND IN LIQUID PARTITIONING PHASES USED IN VAPOR PHASE CHROMATOGRAPHY.
Inventors
- 👤 Herbert R Kwasnik
- 👤 John F Sieckhaus
- 👤 Karl O Knollmueller
Bibliographic Details
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