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采用含特种基团有机硅聚合物制备了拉伸强度为3.92MPa,扯断伸长率为285%的新型硫化硅橡胶,与道康宁公司Sylgard184硅橡胶相比具有更好的耐高温性能,室温至430℃下基本无热失重.采用热失重分析方法研究了新型硅橡胶在不同温度下的热降解行为,通过傅里叶变换红外光谱跟踪测定了不同温度下高温热解产物的红外光谱吸收.研究表明,随热处理温度升高,高温热降解产物中有机烃基基团逐步分解,有机硅橡胶逐步裂解转变为典型的无机硅碳氧化合物;元素化学分析以及光电子能谱测定结果显示,1050℃以上,残余产物的组成主要为Si,C,O元素;X射线衍射分析表明,在1050～1500℃氮气氛条件下的热解产物中逐步转化生成了部分β-SiC结晶结构,且随处理温度升高,碳化硅、方石英的结晶度显著提高.
The new type vulcanized silicone rubber with tensile strength of 3.92MPa and elongation at break of 285% was prepared by using special group containing organic silicon polymer. Compared with Dow Corning Sylgard ® 184 silicone rubber, it has better high temperature resistance, The results showed that there was almost no thermogravimetry at room temperature up to 430 ℃ .The thermal degradation behavior of the novel silicone rubber at different temperatures was studied by TG method and the infrared absorption spectra of pyrolysis products at different temperatures were measured by Fourier transform infrared spectroscopy The results show that with the increase of heat treatment temperature, the organic hydrocarbyl groups in the high temperature thermal degradation products decompose step by step, and the silicone rubber gradually cleaves into typical inorganic silicon oxycarbide compounds. The results of elemental chemical analysis and photoelectron spectroscopy show that 1050 ℃ X-ray diffraction analysis showed that some β-SiC crystal structures were gradually transformed in the pyrolysis products under the atmosphere of 1050 ~ 1500 ℃, and the structure of the β-SiC was gradually changed with the processing temperature Elevated, silicon carbide, cristobalite significantly increased the degree of crystallinity.