JOURNAL OF POLYMER ENGINEERING

 Vol. 23, No. 4, 2003, page 259

Effect of Dry-spinning and Post-treatment Conditions on Structure and Properties of Segmented Poly(urethane-urea) Elastic Fibers

Nori Yoshihara^1,3,*, Hideaki Ishihara², and Toshiro Yamada³

¹ T^{oyobo Research Center, Toyobo Co., Ltd. Katata 2-1-1, Otsu, Shiga, Japan 520-0292Tel: 81-77-571-0083, Fax:81-77-571-0084; e-mail: nori_yoshihara@kt.toyobo.co.jp}

^{2 Advanced Fibro-science, Kyoto Institute of Technology}

^{Matsugasaki, Sakyo-ku, Kyoto, Japan 606-8585}

^{Tel:81-75-724-7365, Fax:81-75-724-7800}

^{e-mail: h-ishi@ipc.kit.ac.jp}

^{3 Faculty of Engineering, Kanazawa University}

^{Kodatsuno 2-40-20, Kanazawa, Ishikawa, Japan 920-8667}

^{Tel:81-76-234-4802, Fax:81-76-234-4829}

^{e-mail:t-yamada@t.kanazawa-u.ac.jp}

ABSTRACT

      Mechanical properties of dry-spun fibers depend much on dry-spinning conditions as well as on polymer structure. A comparison of properties between dry-spun fibers and solvent cast films was made in order to examine the effects of dry-spinning and post-treatment conditions on properties for segmented poly(urethane-urea) (SPUU) samples. 

      The stress-strain (S-S) curves of fibers having slight molecular orientation can be predicted by treating the cast film under a given degree of stretch to adjust the birefringence (Dn) of the film. The value of Dn based on orientation of the hard segment is influenced by dry-spinning conditions and is hardly affected by post-treatment under a relaxed state after dry-spinning. The stress of 300% elongation increases proportionally to be an increase of Dn. Also elastic recovery is improved with an increase of Dn.

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