Abstract
This paper provides a brief survey of the advances in the field of polymer crystallization. Lamellar polymer crystals grow from dilute solutions and melts by a nucleation controlled process (regime I) at low degrees of supercooling and by multiple nucleation (regime II) at higher degrees of supercooling (regime II) (Hoffman et al.). Neutron Scattering studies reveal that under the latter conditions that the radius of gyration of the polymer coil is also preserved in the crystalline state. Fibrillar crystals with polymeric chains oriented in the fibre direction grow from supercooled nematic mesophase and from solutions and melts subjected to elongational flow. These fibrillar polymer crystals may have specific moduli and tensile strengths exceeding that of materials such as steel and glass.
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