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Reactive Compatibilization and Fiber Preparation of Poly(hexamethylene terephthalamide-co-hexamethylene adipamide)/Polycaprolactam Blends
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DOI：10.11777/j.issn1000-3304.2026.25294.png)
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Abstract
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To address the challenge of spinning poly(hexamethylene terephthalamide-co-hexamethylene adipamide)(PA6T-66) due to its high melting point and poor melt fluidity, this work first adopted melt blending with polycaprolactam (PA6). Triphenyl phosphite (TPP) was introduced as a compatibilizer to enhance compatibility, successfully producing compatibilized PA6T-66/PA6 composite fibers. The structure and properties of the fibers were systematically analyzed. The results indicated that with an increasing PA6 content, the melt fluidity of the blend significantly improved while its melting point markedly decreased. When the mass fraction of PA6T-66 was 40%, the prepared composite fiber achieved a breaking strength of 4.64 cN/dtex and retained 93% of its strength after thermal aging. Furthermore, the addition of the compatibilizer caused the molecular weight of the blend system to first increase and then decrease. After adding 0.5% compatibilizer, the melting point of the blend decreased from 274.9 degrees C to 272.6 degrees C, and the molecular weight increased from 19,530 g/mol to 24,100 g/mol. Fibers prepared based on this optimized system exhibited a further enhanced breaking strength of 6.23 cN/dtex, while the strength retention rate after thermal aging remained at 93%.
Keywords:
Semi-aromatic polyamide
Polymer alloy
Crystallization behavior
Melt-spun fiber
Dispersion compatibility
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