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Two-phase crystallization kinetics of syndiotactic polystyrene

In this work, a two phase crystallization model based on the extension of the Kolmogoroff approach was proposed and verified by comparison with experimental isothermal and nonisothermal crystallization data of Syndiotactic Polystyrene (sPS) in a very wide range of cooling rates, up to 600 °C/s. To investigate the effects of high cooling rate on the sPS crystalline structure, a homemade apparatus was adopted. The morphology in solid samples was analyzed by densitometry, IR spectroscopy, and X-rays diffraction. The coupling of these techniques allows the determination of the fractions of different crystalline phases. In agreement with melt-crystallization studies of sPS proposed by different authors, either [alpha] and [beta] forms could be produced depending on the thermal history of the sample. Results show that the stable [beta] form is favored for specimens solidified at higher temperature or under low cooling rates, whereas [alpha] and mesomorphic forms are favoured at low temperature or high cooling rates. The proposed multiphase crystallization kinetics model successfully described all the range of experimental data. © 2010 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 48: 1757-1766, 2010

Authors:   Andrea Sorrentino, Roberto Pantani, Giuseppe Titomanlio
Journal:   Journal of Polymer Science Part B: Polymer Physics
Year:   2010
Pages:   1757
DOI:   10.1002/polb.22041
Publication date:   25-Jun-2010
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