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采用红外(FTIR)、热失重,热分析以及质谱联用(TGA-DTA-MS)、X射线衍射仪(XDR)、能谱仪对紫外光固化乙烯基硅氮烷-巯基共聚体系的热裂解行为进行了分析和表征.结果表明:300～500℃为聚合物裂解反应的主要温度范围.裂解过程会逸出多种小分子气体,其中体系中的S元素可能主要是以H2S和SO2和噻吩类的形式逸出;最终质量保持率为55.3wt%;热裂解转化物表观密度出现先下降后上升的趋势,最终达到2.09g·cm-3;在保温2h的条件下,热裂解转化物在1400℃下生成少量Si3N4晶体,在1600℃下,热裂解转化物晶体质量组成为m(SiO2):m(Si3N4):m(SiC)=3:26:71,结晶度达到91.3%.
The thermal decomposition of the UV-curable vinylsilazane-mercapto copolymer was investigated by Fourier transform infrared spectroscopy (FTIR), thermogravimetry, thermal analysis and mass spectrometry (TGA-DTA-MS), X-ray diffractometer (XDR) The results show that 300 ~ 500 ℃ is the main temperature range of the pyrolysis reaction of the polymer, and many small molecule gases will be released during the pyrolysis process. The S element in the system may be mainly composed of H2S, SO2 and thiophene The final mass retention rate was 55.3wt%. The apparent density of the pyrolysis converter first decreased and then rose, eventually reaching 2.09g · cm-3. Under the conditions of 2h incubation, the thermal decomposition products A small amount of Si3N4 crystal was formed at 1400 ℃. The mass of the pyrolyzed converter crystal was m (SiO2): m (Si3N4): m (SiC) = 3:26:71 at 1600 ℃. The crystallinity reached 91.3%.