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- W2095192709 abstract "Abstract Dilatometric measurements in isobaric cooling mode were performed to study the pressure effects on the crystallization kinetics of polypropylene (PP) up to 100 MPa. The experimental specific volume curves were analyzed by taking into account the thermal gradient that appears in the sample even for relatively low cooling rates. The Tait equation was used to describe the specific volume of the purely amorphous phase, and linear variations of the purely crystalline phase specific volume are considered. The relative crystal linity was modeled using the Nakamura equation, which is relevant for non-constant cooling rates. Considering an Avrami exponent of 3, the Nakamura rate constant was obtained first at atmospheric pressure and then generalized for higher pressures considering the equilibrium melting temperature variation. The obtained intrinsic specific volume was validated by computing the thermal gradient in the sample and comparing the calculated average specific volume to the experimental one. Keywords: Crystallization kineticsNakamura equationPolypropylenePressure-volume-temperature measurementThermal modeling ACKNOWLEDGMENT We want to acknowledge gratefully the companies Legrand, Solvay, and Moldflow for the material supply and characterization and for financial support." @default.
- W2095192709 created "2016-06-24" @default.
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- W2095192709 date "2001-05-31" @default.
- W2095192709 modified "2023-10-17" @default.
- W2095192709 title "ANALYSIS OF THE PRESSURE EFFECT ON THE CRYSTALLIZATION KINETICS OF POLYPROPYLENE: DILATOMETRIC MEASUREMENTS AND THERMAL GRADIENT MODELING" @default.
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- W2095192709 doi "https://doi.org/10.1081/mb-100106159" @default.
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