Terephthaloyl Chloride (TCL, 1,4-benzenedicarbonyl chloride) is the acid chloride of terephthalic acid and is one of two monomers used to make Kevlar, the other being p-phenylenediamine. Its CAS reference number is 100-20-9 and its chemical formula is C8H4Cl2O2.
Terephthaloyl Chloride is used as a key component in performance polymers and aramid fibers, where it imparts flame resistance, chemical resistance, temperature stability, light weight, and very high strength. TCL is also an effective water scavenger, used to stabilize isocyanates and urethane prepolymers.
Terephthaloyl Chloride is a white crystalline solid at room temperature, soluble in common organic solvents. Its melting point is 81.5-83 °C, its boiling point is 265 °C. It is corrosive.
Terephthaloyl Chloride is used for making various copolymers and aramid polymers such as Twaron and kevlar
TCL is used as a key component in performance polymers and aramid fibers, where it imparts flame resistance, chemical resistance, temperature stability, light weight, and very high strength. TCL is also an effective water scavenger, used to stabilize isocyanates and urethane prepolymers.
Terephthaloyl Chloride is a clear, water-white liquid above its freezing point and a white crystalline solid at room temperature. Mixes of terephthaloyl chloride (TCL) and isophthaloyl chloride (ICL) are available on request. DuPont offers TCL as white, free-flowing flakes and as a molten liquid in bulk. TCL is soluble in methylene chloride and other organic solvents.
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