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Preparation and properties of polyphenylene‐1,3,4‐oxadiazole fibres

1973; Wiley; Volume: 32; Issue: 1 Linguagem: Inglês

10.1002/apmc.1973.050320104

1522-9505

I. K. Varma, R. M. Sambandam, D. S. Varma,

Synthesis and properties of polymers

Abstract Copolymers of terephthalic and isophthalic acid (CPODZ) in 1:1 and 3:1 molar ratios with hydrazine sulphate and concentrated sulphuric acid were wet spun using water and H 2 SO 4 coagulation baths. The filaments spun into water bath have inferior mechanical properties than those spun in H 2 SO 4 bath. Physical properties, namely tenacity, elongation, modulus, resilience, elastic recovery, and dynamic mechanical properties were investigated. 1:1 CPODZ filaments showed higher strength, modulus and elasticity than 1:3 CPODZ filaments. These CPODZ fibres had a higher dynaic modulus and low loss tangent. The density and moisture regain of CPODZ filaments were also determined. The density of 1:1 CPODZ filaments was higher. The filaments spun in water bath had higher moisture regain. 1:1 CPODZ filaments had less regain compared to 1:3 CPODZ filaments.