Isothermal crystallization kinetics of glass fiber and mineral-filled polyamide 6 composites |
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Authors: | Selen Şanlı Ali Durmus Nevra Ercan |
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Affiliation: | 1.R&D Department,EPSAN Plastics,Bursa,Turkey;2.Department of Chemical Engineering, Engineering Faculty,Istanbul University,Avc?lar, Istanbul,Turkey |
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Abstract: | In this study, isothermal crystallization kinetics of polyamide 6 (PA6) composites reinforced with surface-treated glass fiber
(GF) and natural, clay-type mineral (MN) were investigated by differential scanning calorimetry method in the presence and
absence of a nucleating agent (NA). Microstructural features of the composites and interfacial interactions between filler
and polyamide phases were also quantified by rheological measurements. The kinetic parameters for the isothermal melt-crystallization
process of the samples were determined with the Avrami and Lauritzen–Hoffman models. The crystallization activation energies
were determined by the Arrhenius method. It was found that the both fillers yielded a significant increase in the storage
modulus of PA6. Kinetic calculations showed that the MN has a more pronounced acceleration effect on the crystallization rate
of PA6 than the GF. Introduction of a small amount of NA significantly favored the isothermal crystallization rate of GF-reinforced
PA6 but did not accelerate that of MN-reinforced one. Based on the results, it has been highlighted that PA6 composites reinforced
with surface-treated GFs and including a small amount of clay-like mineral as a cheap and easy-accessible minor filler could
yield the best performance for the injection-molded PA6 parts because the GF enhances the mechanical properties and the clay-like
mineral accelerates the crystallization rate. |
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