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

Published online by Cambridge University Press:  01 February 2011

F. Hernández-Sánchez  and
H. Carrillo-Escalante
F. Hernández-Sánchez
Affiliation:
Centro de Investigación Científica de Yucatán, A.C. Calle 43 No. 130, Col. Chuburná de Hidalgo, C.P. 97200, Mérida. Yucatán, México. Email: [email protected]
H. Carrillo-Escalante
Affiliation:
Centro de Investigación Científica de Yucatán, A.C. Calle 43 No. 130, Col. Chuburná de Hidalgo, C.P. 97200, Mérida. Yucatán, México. Email: [email protected]
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Abstract

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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1242: Symposium 4 – Materials Characterization , 2009 , S4-P102
Copyright
Copyright © Materials Research Society 2010

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References

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