A Study of the Kinetics of Polylactic Acid Crystallization by Image Processing


The polylactic acid (PLLA) is commonly used in the biomedical application. The physical and mechanical properties of PLLA depend on the molecular weight, crystallinity, and synthesis. In this work, we study the PLLA crystallization kinetics. One of the main attractive of these polymers is that its degree of crystallinity can easily be modified, from amorphous state to a high crystallinity degree. In this study a new technique is applied to follow the crystallization kinetic. An optical microscope with cross polarizers, warming plates and video camera were used. A series of images were obtained under isothermal conditions to observe the growth spherulite. Since an image is composed by pixels and each pixel has a value from 0 to 255, which represents gray intensity, being zero for black and 255 are white. Then, the pixels average versus time was plotting and from the plots crystallization kinetic and secondary crystallization are easily obtained.

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  1. 1

    Donald Garlotta, Journal of Polymers and the Environment 9, 63 (2002).

    Article  Google Scholar 

  2. 2

    E. Urbanovici, H. A. Schneider, D. Brizzolara and H. J. Cantow, Journal of Thermal Analysis 47, 931 (1996).

    CAS  Article  Google Scholar 

  3. 3

    R.J.M. Zwiers, S. Gogolewski and J. Pennings, Polymer 24, 167 (1983).

    CAS  Article  Google Scholar 

  4. 4

    K. Kishore, R. Vasanthakumari, Colloid & Polymer Science 266, 999 (1988).

    CAS  Article  Google Scholar 

  5. 5

    Manuel Salmerón Sánchez, Vincent B. F. Mathot, Geert Vanden Poel, and José Luis Gómez Ribelles, Macromolecules 40, 7989 (2007).

    Article  Google Scholar 

  6. 6

    Grte Strobl, The Physics of Polymers, 2nd ed. (Springer, New York, 1997) pp185–160.

    Google Scholar 

  7. 7

    C Liu, M Muthukumar, Journal of Chemical and Physics 109, 2536 (1998).

    CAS  Article  Google Scholar 

  8. 8

    J. D. Hoffman, L. J. Frolen, G.S. Ross, J.I. Lauritzen, Journal of Research of the National Bureau of Stadars- A. Physics and Chemistry, 79A, 671 (1975).

    CAS  Google Scholar 

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Olvera-Gracia, M., Kryshtab, T., Paniagua-Mercado, A.M. et al. A Study of the Kinetics of Polylactic Acid Crystallization by Image Processing. MRS Online Proceedings Library 1242, 102 (2009). https://doi.org/10.1557/PROC-1242-S4-P102

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