PREPARATION OF POLYSILOXANES FROM SILICIC-ACID .9. PARTIALLY SILYLATED SILICIC-ACID AND ITS SPINNABILITY

The reaction in different molar ratios of trimethylchlorosilane to silicic acid offered partially silylated silicic acids PSSX (X equals OH) with various degrees of silylation. Esterification and acetylation of PSSX (X equals OH) with 1-butanol or acetylchloride gave polysiloxanes PSSX (X equals OBu**n and OCOCH//3). Some of them showed an excellent spinnability and provided a fine fiber with a length of about 250 cm. A fiber drawing test from concentrated PSSX solutions of various solvents revealed that spinnability markedly depended on the DS, functional group X of PSSX, and solvent. Spinnability may also be correlated to solubility parameter of PSSX and solvent.