Journal
POLYMER
Volume 53, Issue 2, Pages 277-282Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2011.11.064
Keywords
Isotactic polypropylene; Nucleation; Crystallization
Categories
Funding
- Deutsche Forschungsgemeinschaft (DFG)
- European Union
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Differential fast scanning chip calorimetry has been employed to study nucleation/ordering during annealing the glass of quenched isotactic polypropylene. Initially non-ordered samples were annealed below the glass transition temperature for different periods of time, and the change of structure during isothermal annealing was then analyzed by monitoring the exchange of latent heat on heating. Primary result of this work is the proof of homogeneous nucleation of ordering and mesophase formation in the glassy state. It is suggested that only local non-cooperative mobility of molecular segments is required to form small, ordered domains, and that the classical nucleation theory, which restricts nucleation of the crystallization/ordering process of polymers to temperatures between the equilibrium melting temperature and the glass transition temperature, needs modification. (C) 2011 Elsevier Ltd. All rights reserved.
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