With increased public awareness of fire-safety, flame retardant materials have been widely used and developed. Among them, a polyester called CPET, synthesized by the copolymerization of polyethylene terephthalate and 2-carboxyethyl (phenyl) phosphinic acid, has a good fire-safety and has been employed in the manufacture of synthetic fibers. However, the fabricated fiber made of CPET simultaneously possessing good flame retardancy and mechanical properties is a dilemma. Herein, we resolve this problem through the reactive blending of CPET with a type of thermotropic liquid crystal copolyester (PPDT) and subsequently solid-state polymerization (SSP). Thus, the fire-safety of the CPET/PPDT_SSP blend improves greatly. The peak heat release rate, total heat release, and total smoke release decrease by 31.2%, 16.3%, and 11.0%, respectively, compared with those of CPET. Meanwhile, the CPET/PPDT_SSP shows better crystallization and mechanical properties than CPET. The strength at yield and Young’s modulus of CPET/PPDT_SSP increase by 20.0% and 15.8%, respectively. This blend shows great potential in the fabrication of fire-safety fibers with high strength.

随着人们防火安全意识的提高，阻燃材料得到了广泛的应用和开发。其中，由聚对苯二甲酸乙二醇酯与2-羧乙基（苯基）次膦酸共聚而成的聚酯称为CPET，具有良好的防火安全性，已用于制造合成纤维。然而，由CPET制成的纤维同时具有良好的阻燃性和机械性能是一个两难的选择。在这里，我们通过 CPET 与一种热致液晶共聚酯 (PPDT) 的反应共混和随后的固态聚合 (SSP) 解决了这个问题。因此，CPET/PPDT _SSP的防火安全性混合大大改善。与CPET相比，峰值放热率、总放热量和总发烟量分别降低了31.2%、16.3%和11.0%。同时，CPET/PPDT _SSP显示出比 CPET 更好的结晶和机械性能。CPET/PPDT _{SSP 的}屈服强度和杨氏模量分别增加了 20.0% 和 15.8%。这种混合物在制造高强度防火纤维方面显示出巨大的潜力。