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采用亚磷酸三苯酯和双酚A,分别以乙酸锂(LiAc)和氢氧化锂(LiOH)为催化剂,通过熔融缩聚法合成含磷聚酯。分别通过示差扫描量热仪(DSC)、热重分析仪(TG)和微型量热仪对制得的样品进行热稳定性测试。结果表明:反应3.5h,与LiAc作催化剂制得的含磷聚酯相比,LiOH作催化剂制得的样品具有更高的玻璃化温度达57.34℃;更好热稳定性,初始分解温度为263.1℃,700℃时失重率为26.52%;燃烧稳定性也更好,最大热释放速率为597.0W/g,对应温度为525.4℃。
Phosphorus-containing polyesters were synthesized by melt polycondensation using triphenyl phosphite and bisphenol A as catalysts, respectively, using lithium acetate (LiAc) and lithium hydroxide (LiOH) as catalysts. The prepared samples were tested for their thermal stability by differential scanning calorimetry (DSC), thermogravimetric analysis (TG) and microcalorimeter respectively. The results showed that the reaction temperature was 3.5h, the LiOH catalyst prepared samples with higher glass transition temperature of 57.34 ℃, better thermal stability and initial decomposition temperature of 263.1 ℃, and the weight loss rate is 26.52% at 700 ℃. The combustion stability is also better. The maximum heat release rate is 597.0W / g and the corresponding temperature is 525.4 ℃.