In this study, vinyl-terminated polysiloxane (abbreviated VISR) and allyl-terminated polysiloxane (abbreviated ALSR) were synthesized and characterized. The curing behaviors and viscoelastic and thermal properties of VISR/PHSR and ALSR/PHSR were comparatively investigated. DSC and in situ FT-IR spectroscopy can be adopted to study the influence of molecular structures on reactivity. The results prove that ALSR/PHSR shows higher reactivity including a higher reaction rate constant and cure degree than VISR/PHSR. Moreover, it is found that the Šesták-Berggren equation can adequately depict the cure kinetic model of silicone resin in hydrosilylation comparing the calculated results with experimental data. Additionally, DMA exhibits that the glass transition temperature and cross-linking density of ALSR/PHSR are much lower than those of VISR/PHSR, TGA data reveal that they have similar thermal stability as well as high char yield, and the decomposition energy ranges from 100 to 270 kJ/mol with increment of degree of mass conversion (α_d) (α_d = 0.15–0.85).

中文翻译：

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具有不同反应性基团的两种支链硅树脂：对比评估

在这项研究中，合成并表征了乙烯基封端的聚硅氧烷（缩写为VISR）和烯丙基封端的聚硅氧烷（缩写为ALSR）。比较研究了VISR / PHSR和ALSR / PHSR的固化行为以及粘弹性和热性能。可以采用DSC和原位FT-IR光谱研究分子结构对反应性的影响。结果证明，ALSR / PHSR具有比VISR / PHSR更高的反应活性，包括更高的反应速率常数和固化度。此外，将计算结果与实验数据进行比较，发现Šesták-Berggren方程可以充分描绘硅树脂在氢化硅烷化中的固化动力学模型。此外，DMA还显示出ALSR / PHSR的玻璃化转变温度和交联密度远低于VISR / PHSR，_d）（α _d = 0.15-0.85）。