Textile Science and Engineering (한국섬유공학회지)

The Korean Fiber Society (한국섬유공학회)
권호 표지

Study on the Drawing and Deiodination of the Poly(vinyl Alcohol) Film Iodinated in Solution Before Casting

성형 전 용액상태에서 요드화된 폴리비닐알코올 필름의 연신 및 요드 제거에 관한 연구

  • 손현식 (동아대학교 의상섬유학부 섬유공학전공) ;
  • 신은주 (동아대학교 의상섬유학부 섬유공학전공) ;
  • 이양헌 (동아대학교 의상섬유학부 섬유공학전공)
  • Published : 2004.10.01
⟨ Previous Next ⟩

Abstract

Two kinds of poly(vinyl alcohol)(PVA) films iodinated in solution before casting (IBC) with weight gains of 100%(slightly crystalline) and 150%(completely amorphous) were drawn at room temperature. Iodine was eliminated by immersing the films in sodium thiosulfate solutions in ethylene glycol(EG)/water and N-methylformamide(NMFA) followed by washing and drying. The degree of swelling of undrawn film on deiodination was lower and the deiodination time was longer in the NMFA solution than in the EG/water solution. All the undrawn films after deiodination and drying exhibited considerable and mutually similar crystallinity. While a major portion of the crystallization occurred in the course of drying after immersing in the EG/water solution, the larger half of the crystallization occurred in the course of immersing in the NMFA solution. Drawability of the IBC film was very high even at room temperature to readily produce a draw ratio of 8. The degree of swelling of the drawn film on deiodination decreased continuously and the deiodination time increased and then decreased with increasing draw ratio. The degree of swelling and the deiodination time were relatively low and long, respectively, when the NMFA solution was used as solvent. The crystallinity, orientation, initial modulus of the drawn films after deiodination and drying increased with draw ratio, and was relatively high when the NMFA solution was used as solvent and the weight gain were lower.

Keywords

References

  1. I. Sakurada, 'Polyvinyl Alcohol Fibers', p.147, Marcel Dekker Inc., New York and Basel, 1985
  2. M. M. Zwick, 'Poly(vinyl Alcohol)-Iodine Complexes', J. Appl. Polym. Sci., 9, 2393-2424(1965) https://doi.org/10.1002/app.1965.070090706
  3. H. C. Haas, 'Polyvinyl Alcohol-Properties and Applications', pp.503-505, John Wiley & Sons, London . New York . Sydney . Toronto, 1973
  4. H. Takamiya, Y. Tanahashi, T. Matsuyama, T. Tanigami, K Yamaura, and S. Matsuzawa, 'On the Poly(vinyl alcohol)-Iodine Complexes', J. Appl. Polym. Sci., 50, 1807-1813 (1993) https://doi.org/10.1002/app.1993.070501017
  5. Y. S. Choi and K. Miyasaka, 'Structure of Poly(vinyl alcohol)-Iodine Complexe Formed in the Amorphous Phase of Poly(vinyl alcohol) Film', J. Appl. Polym. Sci., 48, 313-317(1993) https://doi.org/10.1002/app.1993.070480215
  6. Y. Oishi and K. Miyasaka, 'Effect of the Degree of Hydration of Water Swollen Poly(vinyl alcohol) Films on Their Iodine Complexation', Polym. J., 18, 307-313(1986) https://doi.org/10.1295/polymj.18.307
  7. Y. Oishi and K. Miyasaka, 'Formation of Poly(vinyl alcohol) -Iodine Complex in Water Swollen Films on Extension', Polym. J., 19, 331-336(1987) https://doi.org/10.1295/polymj.19.331
  8. H. Sakuramachi, Y. S. Choi, and K. Miyasaka, 'Poly(vinyl alcohol)-Iodine Complex in Poly(vinyl alcohol) Films Soaked at High Iodine Concentrations', Polym. J., 22, 638-642(1990) https://doi.org/10.1295/polymj.22.638
  9. Y. Oishi, H. Yamamoto, and K. Miyasaka, 'Structure of Poly(vinyl alcohol)-Iodine Complex in Water Swollen Film', Polym. J., 19, 1261-1268(1987) https://doi.org/10.1295/polymj.19.1261
  10. T. Yokota and Y. Kimura, 'A Peculiar Temperature-dependent behavior of Iodine Species at the Formation of Chromophore Between Iodine and Aqueous Poly(vinyl alcohol)', Makromol. Chem., 185, 749-755(1984) https://doi.org/10.1002/macp.1984.021850411
  11. T. Yokota, 'Iodine-poly(vinyl alcohol) Interactions, 2 Anomalous Slow Quenching of the Chromophore After Extraction of Free Iodine with Carbon Tetrachoride', Makromol. Chem., 186, 549-557(1985) https://doi.org/10.1002/macp.1985.021860310
  12. N. Okada and I. Sakurada, 'X-ray Studies on the Reaction between Polyvinyl Alcohol and Iodine', Kobunshi Kagaku, 15, 559-563(1958) https://doi.org/10.1295/koron1944.15.559
  13. Y. S. Choi, Y. Oishi, and K. Miyasaka, 'Change of Poly(vinyl alcohol) Crystal Lattice by Iodine Sorption', Polym. J., 22(7), 601-608(1990) https://doi.org/10.1295/polymj.22.601
  14. E. J. Shin, 'Study on the Structure and Processability of the Iodinated Poly(vinyl Alcohol) (II) -Drawability of the Iodinated Films-', J. Appl. Polym. Sci., to be pressed
  15. Y. H. Lee, E. J. Shin, and S. C. Choi, 'Structure of Poly(vinyl Alcohol) Films Iodinated in Solution Before Casting', J. Korean Fiber Soc., 39(2), 173-179(2002)
  16. Y. H. Lee, H. H. Lim, and E. J. Shin, 'Structure of the Film Prepared by Melt-Process and Deiodination of Amorphous Poly(vinyl Alcohol)-Iodine Complex', J. Korean Fiber Soc., 41(1), 10-15(2004)
  17. I. Abu-Isa, '$\alpha$-$\gamma$ Transition in Nylon 6', J. Polym. Sci. Part A-1, 9, 199-216(1971) https://doi.org/10.1002/pol.1971.150090119
  18. N. S. Murshy, S. M. Aharoni, and A. B. Szollosi, 'Stability of the $\gamma$Form and the Development of the $\alpha$ Form in Nylon 6', J. Polym. Sci. Polym. Phys., 23, 2549-2565(1985) https://doi.org/10.1002/pol.1985.180231212
  19. E. J. Shin, Y. H. Lee, and S. C. Choi, 'Structure after Deiodination of Iodinated Undrawn and Drawn Poly(vinyl Alcohol) Films', J. Korean Fiber Soc., 39(6), 648-653 (2002)
  20. E. J. Shin, Y. H. Lee, and S. C. Choi, 'Study on the Structure and Processability of the Iodinated Poly(vinyl Alcohol) I. Thermal Analyses of Iodinated Poly(vinyl Alcohol) Films', J. Appl. Polym. Sci., 91(4), 2407-2415 (2004) https://doi.org/10.1002/app.13400