Silicon-containing novel polymers, polyalkyl(aryl) silicates (Remark: Graphics omitted.) and (Remark: Graphics omitted.), were prepared by the reaction of diaminosilanes with aliphatic or aromatic diols. The products were a white powder (fused at about 300°C), a highly viscous liquid, or a glassy solid; these products were soluble in common organic solvents, but insoluble in methanol. The results of the molecular-weight determination by the vapour-pressure method indicated that some of polymers had a molecular weight of 5000 or 6000. A study of the thermal stability of the polymers by means of TGA and DTA analysis made clear that the polymers with the aryloxy group in the molecular main chain were remarkably more stable than those with the alkoxy group. The former indicated a weight loss of about 50% at 350–400°C. An investigation of the TGA curve and thermal decomposition products allowed us to discuss the probable process for the degradation of the polymers. The reaction of the diaminosilanes with 1,4-butanediol afforded distillable products rather than the expected polymers; these products were identified as being cyclic alkoxysilanes.
含
硅的新型聚合物、聚烷基(芳基)
硅酸盐(备注:省略了图形)和(备注:省略了图形)是通过二
氨基
硅烷与脂肪族或芳香族二醇的反应制备的。这些产品为白色粉末(在约300°C下熔化)、高粘度液体或
玻璃状固体;这些产品可溶于常见的有机溶剂,但不溶于
甲醇。通过蒸汽压法测定分子量表明,一些聚合物的分子量为5000或6000。通过TGA和DTA分析对聚合物的热稳定性进行的研究表明,分子主链中带有芳氧基的聚合物比带有烷氧基的聚合物稳定得多。前者在350-400°C时重量损失约为50%。通过对TGA曲线和热分解产物的研究,我们讨论了聚合物降解的可能过程。二
氨基
硅烷与
1,4-丁二醇的反应产生了可蒸馏产物,而不是预期的聚合物;这些产物被确定为环状烷氧基
硅烷。