High performance polyamide 6 fibers using polycarbonate based thermoplastic polyurethane thin film Coatings- A novel method

Baiju John, Ken Kojio, Mutsuhisa Furukawa

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Polycarbonate based thermoplastic polyurethanes (CPU2) were prepared and coated onto polyamide 6 (PA 6) fibers. The CPU2 thin film coatings were prepared by dipping the PA 6 fibers into a viscous CPU2 adduct and cured at 100 °C for 12 h. Both the tensile strength and the elongation at break of the CPU2 thin film coated PA 6 fibers (CPU2-PA6) increased although both the magnitudes of CPU2 are much lower than for the original PA 6 fibers. FE-SEM observation revealed that ; there existed an interface interaction region of 10 um at the interface of PA 6 fiber and the CPU2 thin film coating. Generally , speaking, it is considered that the break of PA 6 fibers is due to the formation of the micro-cracks on the fiber surface when it is under a tensile load. The coating of CPU2 onto the PA 6 fibers reduced the formation of micro-cracks during the elongation process, resulted in the improvement of the mechanical properties. Also, the CPU2-PA6 fibers when exposed to weathering i• tests to check the weathering resistance, showed an increase in the tensile strength for 0-50 h of exposure. This was due to the ; UV light induced crystalline transformation, i.e., from the a crystalline phase to the y crystalline phase. The CPU2-PA6 fibers j I almost retained the strength even after 200 h of exposure in a weatherometer. The crystalline transformations due to the UV 't irradiations have not been reported yet. Also, the CPU2 showed good adhesion property with the PA 6 films. The blending i with various polymers or composites is generally employed for the performance enhancement of PA 6 fibers. On the contrary, the method employed in this study improved the performance of PA 6 fibers without changing its inherent morphological properties.

Original languageEnglish
Pages (from-to)319-326
Number of pages8
JournalPolymer Journal
Issue number4
Publication statusPublished - 2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Materials Chemistry


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