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Significant Improvement of Mechanical Properties for Polyvinyl Alcohol Film Prepared from Freeze/Thaw Cycled Gel

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DOI: 10.4236/ojopm.2013.34018    4,120 Downloads   7,135 Views   Citations

ABSTRACT


The mechanical properties of polyvinyl alcohol (PVA) films prepared by evaporating water from freeze/thaw cycled gel were investigated as a function of the number of freeze/thaw cycles. The maximum stress of the PVA film prepared by freeze/thaw cycling was larger than that prepared without the freeze/thaw cycle process. The largest maximum stress was 46.2 MPa for a film prepared with 10 freeze/thaw cycles, which was twice as large as that for a cast PVA film without freeze/thaw cycling (22.3 MPa). This is due to the formation of small crystallites during the freeze/thaw cycle process. Furthermore, when the film was annealed at 130°C, the maximum stress was as high as 181 MPa which was comparable to that for PVA films prepared using additives. The crystallinity is not the main factor that determines the maximum stress for either the non-annealed or annealed freeze/thaw cycled films, but the glass transition temperature is well correlated with the maximum stress, irrespective of the annealing process. This is due to the different molecular morphology; the non-annealed freeze/thaw cycled film consists of many small crystallites, but the annealed film consists of larger crystallites formed during the annealing process.


Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

T. Fukumori and T. Nakaoki, "Significant Improvement of Mechanical Properties for Polyvinyl Alcohol Film Prepared from Freeze/Thaw Cycled Gel," Open Journal of Organic Polymer Materials, Vol. 3 No. 4, 2013, pp. 110-116. doi: 10.4236/ojopm.2013.34018.

References

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[34] R. Ricciardi, F. Auriemma, C. Gaillet, C. De Rosa and F. Laupretre, “Investigation of the Crystallinity of Freeze/ Thaw Poly(vinyl alcohol) Hydrogels by Different Techniques,” Macromolecules, Vol. 37, No. 25, 2004, pp. 9510- 9516. http://dx.doi.org/10.1021/ma048418v
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[36] T. Nakaoki and H. Yamashita, “Coagulation Dimension of Freezable Bound Solvent in Isotactic Polypropylene/o-Dichlorobenzene Gel,” Journal of Molecular Structure, Vol. 875, No. 1-3, 2008, pp. 282-287. http://dx.doi.org/10.1016/j.molstruc.2007.04.040
[37] T. Nakano and T. Nakaoki, “Coagulation Size of Freezable Water in Poly(vinyl alcohol) Hydrogels Formed by Different Freeze/Thaw Cycle Periods,” Polymer Journal, Vol. 43, 2011, pp. 875-880. http://dx.doi.org/10.1038/pj.2011.92
[38] P. J. Willcox, D. W. Howie, K. Shimidt-Rohr, D. A. Hoagland, S. P. Gido, S. Pudjijanto, L. W. Kleiner and S. J. Venkatraman, “Microstructure of Poly(vinyl alcohol) Hydrogels Produced by Freeze/Thaw Cycling,” Journal of Polymer Science Part B, Vol. 37, No. 24, 1999, pp. 3438-3454. http://dx.doi.org/10.1002/(SICI)1099-0488(19991215)37:24<3438::AID-POLB6>3.0.CO;2-9
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[40] R. Hernandez, A. Sarafian, D. Lopez and C. Mijangos, “Structure of Poly(vinyl alcohol) Cryo-Hydrogels as Studied by Proton Low-Field NMR Spectroscopy,” Polymer, Vol. 46, 2004, pp. 5543-5550.

  
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