Journal
JOURNAL OF MACROMOLECULAR SCIENCE-PHYSICS
Volume B41, Issue 4-6, Pages 685-709Publisher
TAYLOR & FRANCIS INC
DOI: 10.1081/MB-120013059
Keywords
polypropylene; crystal structure; polymorphism; growth transitions
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Several aspects of the structure, morphology,growth transitions, and optical properties of isotactic polypropylene (iPP) are considered; we deal mostly with its two more classical alpha and beta crystal modifications (alphaiPP and betaiPP). A derivation of the frustrated crystal structure of betaiPP is presented. The existence of two beta --> alpha growth transitions, at both low and high crystallization temperatures is so far unique in polymer science. The optical properties of the so-called mixed alpha phase spherulites are known to depend on the crystal orientations of radial (parent) and tangential (daughter) lamellae and the absence of short-range averaging of cell orientations in alphaiPP. Possible structural origins of reduced lamellar branching are considered, namely the tapering of lamellae and surface roughness.
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