4.4 Article

High fire-safety phosphorus-containing polyethylene terephthalate with well-balanced comprehensive performances by reactive blending with liquid crystalline copolyester

Journal

HIGH PERFORMANCE POLYMERS
Volume 34, Issue 1, Pages 15-23

Publisher

SAGE PUBLICATIONS LTD
DOI: 10.1177/09540083211028881

Keywords

fire-safety; liquid crystalline copolyester; solid-state polymerization; phosphorus-containing polyethylene terephthalate

Funding

  1. National Natural Science Foundation of China [21634006, 51827803]

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By reactive blending CPET with PPDT and subsequently undergoing solid-state polymerization, the fire-safety of the resulting blend is greatly improved. This blend shows enhanced crystallization and mechanical properties compared to CPET, with the potential to be used in the fabrication of high-strength fire-safety fibers.
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/PPDTSSP 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/PPDTSSP shows better crystallization and mechanical properties than CPET. The strength at yield and Young's modulus of CPET/PPDTSSP increase by 20.0% and 15.8%, respectively. This blend shows great potential in the fabrication of fire-safety fibers with high strength.

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