Abstract
Poly(phenylene sulfide) (PPS) is an engineering thermoplastic polymer that presents high temperature resistance (glass transition temperature around 85 ºC and melting point at 285 ºC). These properties combined with its mechanical properties and its high chemical resistance allows its use in technological applications such as molding resins and as matrix for structural thermoplastic composites. During the manufacture of thermoplastic composites, the polymer is exposed to repeated melting, quenching and crystallization processes. The properties of semicrystalline polymers, such as PPS, depend on its crystallization behavior. This work deals with the PPS crystallization kinetics under different thermal cycles. This study was performed under isothermal conditions in a differential scanning calorimetry (DSC), coupled to Perkin Elmer crystallization software referred to as Pyris Kinetics - Crystallization. The results were correlated with microscopic analyses carried out in a polarized light microscope, equipped with a controlled heating and cooling accessory. In this case, the experimental conditions were the same adopted for the DSC analyses. From the results, parameters could be established to be used in the composite manufacture.
Highlights
Introduction ofPPS consist of: a=0.867 nm; b=0.561 nm; c=1.026 nm (Figure 1)
The PPS isothermal crystallization behavior was studied by using differential scanning calorimetry (DSC) and polarized light microscope (PLM) techniques
It was verified that isothermal crystallization from melted PPS can be described by Avrami kinetic modeling
Summary
Introduction ofPPS consist of: a=0.867 nm; b=0.561 nm; c=1.026 nm (Figure 1). The phenyl rings are inclined in an alternatingThe poly(phenylene sulfide) has attracted considerable manner to the backbone plane, the angle of inclination being interest as engineering polymer due to its both high modulus assumed to lie in the 40-45° range. Its thermal transitions for this polymer occur exceptionally at high deflection temperature (around 227 °C), flame high temperatures, in comparison to aliphatic polymers, resistance, and excellent stability in organic liquids due to the restricted mobility of the chains imposed by determine many of its applications. These properties make phenyl groups on backbone[6,7]. Some studies have been carried out to telephone components, optical-fiber cables, electronic investigate the crystalline structure, morphology, thermal component encapsulation, and as a thermoplastic matrix stability and crystallization kinetics of PPS[6,7]
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