The Temperature Dependence of Spherulitic Growth Rates in Isotactic Poly(styrene) Revisited (original) (raw)

Abstract

Isothermal spherulitic growth rates were measured for a series of narrow molecular weight distribution isotactic poly(styrene) samples (250,000 - 1,600,000 g/mol) between 120.5C and 223.5C. Curve fitting analyses of the spherulitic growth rate data using a modified version of the Lauritzen-Hoffman theory allowed us to derive the equilibrium melting temperature, the secondary nucleation constant, and the Vogel parameters (B and T(infinity)) describing the temperature dependence of segmental relaxation in the liquid state. The Vogel parameters derived from the crystal growth rate analysis are in quantitative agreement with those derived from our study of the temperature dependence of the stress relaxation modulus. The equilibrium melting temperature derived from our analysis is significantly higher than that estimated in the literature using the Hoffman-Weeks method. The spherulitic growth rates are independent of chain length in the molecular weight range investigated. S! caling laws...

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