ESTIMATION OF THERMODYNAMIC AND KINETIC SECONDARY NUCLEATION PARAMETERS IN POLY(STYRENE-CO-MALEIC ANHYDRIDE)/POLY(εεεεCAPROLACTONE) BLENDS

Authors

  • Vittoria Balsamo
  • Laura M. Gouveia

Abstract

The  estimated equilibrium melting points  of  the  poly(e-caprolactone) (PCL)  fraction in  poly(styrene-co-maleic anhydride)/poly(e-caprolactone) blends (PSMA14/PCL), where the PSMA has 14 mol% of maleic anhydride units, were successfully analyzed by means of the Nishi-Wang equation yielding a negative Flory-Huggins interaction parameter (c = –1.46 ). This result indicates strong interactions between the blend components, whose magnitude do not change with composition. The kinetics of the PCL spherulitic growth was investigated as a function of composition and crystallization temperature by polarized optical  microscopy and  analyzed using the  traditional Lauritzen-Hoffman (LH)  secondary nucleation theory, as well as a modified version of it. The composition dependence of nucleation constants, Kg, in crystal growth regime II suggests that crystal fold energy, se, decreases with the addition of PSMA14, but when the concentration of PSMA14 reaches 20% or more, non additional effect is observed, a fact that was attributed to the PCL effective concentration considered in the Lodge and McLeisch model for miscible blends.

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Published

2010-11-15

How to Cite

Balsamo, V., & Gouveia, L. M. (2010). ESTIMATION OF THERMODYNAMIC AND KINETIC SECONDARY NUCLEATION PARAMETERS IN POLY(STYRENE-CO-MALEIC ANHYDRIDE)/POLY(εεεεCAPROLACTONE) BLENDS. LatinAmerican Journal of Metallurgy and Materials, 26–34. Retrieved from https://www.rlmm.org/ojs/index.php/rlmm/article/view/131

Issue

2011, 31(1)

Section

Regular Articles

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