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采用动态力学分析(DMA)法和红外光谱(FT-IR)法,研究了不同老化条件下SBSVP(吡啶基官能化苯乙烯-丁二烯-苯乙烯嵌段共聚物)的热老化行为。结果表明:SBSVP在无氧热老化过程中,其降解反应与交联反应并存,并发生动态变化;低于160℃时以降解反应为主,超过160℃时交联反应占优势,聚合物交联密度变化是导致材料储能模量及玻璃化转变温度发生相应变化的主要原因;SBSVP热老化后,其分子链中的C=C键含量降低,说明老化主要发生在PB链段;SBSVP在热老化过程中,老化温度对其影响程度大于老化时间。
The thermal aging behavior of SBSVP (pyridyl-functionalized styrene-butadiene-styrene block copolymer) under different aging conditions was studied by dynamic mechanical analysis (DMA) and Fourier transform infrared spectroscopy (FT-IR) The results showed that the degradation reaction and crosslinking reaction coexist and undergo dynamic changes during the process of anaerobic heat aging. When the temperature is below 160 ℃, the degradation reaction is dominant. When the temperature exceeds 160 ℃, the cross-linking reaction predominates. The main reason for the change in the bulk density and the glass transition temperature is the decrease of the C = C bond content in the molecular chain of SBSVP after heat aging, indicating that the aging mainly occurs in the PB segment. In the process of heat aging, the influence of aging temperature is greater than the aging time.