Transmission electron microscopy observations on fine structures of shish-kebab crystals of isotactic polystyrene by partial melting
2002; Elsevier BV; Volume: 243; Issue: 1 Linguagem: Inglês
10.1016/s0022-0248(02)01453-7
ISSN1873-5002
AutoresTianxi Liu, Wuiwui Chauhari Tjiu, Juergen Petermann,
Tópico(s)Polymer Nanocomposites and Properties
ResumoThe composite morphology and melting behavior of isothermally cold-crystallized isotactic polystyrene (iPS) shish-kebab crystals have been studied by transmission electron microscopy (TEM). The fine structures of iPS shish-kebabs are reflected at lamellar resolution by partial melting treatment using bright- and dark-field imaging modes. TEM observations indicate that the entire shish-kebab entity consists of several components: the central extended-chain micro-shish crystals, the partially extended-chain macro-shish crystals which are intrinsically connected with the micro-shish cores, the overgrown micro-kebabs by primary crystallization, and the macro-kebabs formed by secondary crystallization on macro-kebab nuclei. The reversible morphological transformation between the micro- and macro-kebabs has been visualized on nanoscale via melting and recrystallization processes, due to the difference in their thermal stability.
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