The kinetics of condis (conformationally disordered) crystal formation from the melt and of rigid crystals from condis crystals has been studied by differential scanning calorimetry for trans‐1,4‐polybutadiene and polytetrafluoroethylene. Generally very low two‐stage Avrami exponents between 0.02 and 1.74 were needed to describe the fast and often incomplete crystallizations. None of the commonly accepted crystal nucleation and growth models seems to fit the data.
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Grȩbowicz et al. (1986) studied this question.
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