Terephthaloyl chloride copolyamides

Technora. In 1985, Teijin Ltd. introduced Technora fiber, previously known as HM-50, into the high performance fiber market. Technora is based on the 1 1 copolyterephthalamide of 3,4 -diaminodiphenyl ether and/ -phenylenediamine (8). Technora is a whoUy aromatic copolyamide of PPT, modified with a crankshaft-shaped comonomer, which results in the formation of isotropic solutions that then become anisotropic during the shear alignment during spinning. The polymer is synthesized by the low temperature polymerization of/ -phenylenediamine, 3,4 -diaminophenyl ether, and terephthaloyl chloride in an amide solvent containing a small amount of an alkaU salt. Calcium chloride or lithium chloride is used as the alkaU salt. The solvents used are hexamethylphosphoramide (HMPA), A/-methyl-2-pyrrohdinone (NMP), and dimethyl acetamide (DMAc). The stmcture of Technora is as follows ... 

Table 5.2. Selected copolyamides for high-strength high-modulus fibers form 1,4-phenylenediamine, terephthaloyl chloride and a third monomer.

Aromatic copolyamides, including the 50/50 (molar) copolymer of 3,4 -diamino-diphenyl ether with terephthaloyl chloride, are synthesized in a similar manner using amide solvent-salt combinations, in practice NMP-CaCl2- This 50/50 copolymer is in fact not processed via lyotropic solution, but rather directly as the (relatively dilute) polymerization reaction mixture the impressive yarn properties are realized only after hot drawing. Concentrated LC solutions in sulfuric acid are inaccessible due to degradation of the polymer in that medium. 

The two typical example of copolyamide type of aramid fibres are Technora (Teijin) and Kermel (Kermel) fibres. Technora fibres is produced from reactions between a mixture of p-phenylenediamine (PPD) and 3,4 -diaminodiphenylether (3,4 -ODA) with terephthaloyl chloride (TC1), and Kermel fibre is a polyamide imide (PAI) fibre, which has the advantage of having little shrinkage in hot water (= 0%) and hot air (0.2%). ... 

Aromatic copolyamides, including the 50/50 (molar ratio) copolymer of 3,4 -diaminodiphenyl ether with terephthaloyl chloride, are synthesized in a similar manner using amide solvent-salt combinations—in practice... 

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