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Syndiotactic Polystyrene Films with Different Uniplanar Orientations: Additional Information on Crystal Phase Transitions
Author(s) -
Rizzo Paola,
Albunia Alexandra R.,
Guerra Gaetano
Publication year - 2013
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201200275
Subject(s) - tacticity , polystyrene , diffraction , crystallography , materials science , annealing (glass) , phase (matter) , reflection (computer programming) , polymer chemistry , optics , chemistry , polymer , composite material , physics , polymerization , organic chemistry , computer science , programming language
Syndiotactic polystyrene δ form films, exhibiting a // c // and a ⟂ c // uniplanar orientations and subjected to annealing procedures in the temperature range of 60–130 °C, have been thoroughly characterized by X‐ray diffraction. The reported results indicate that the gradual irreversible transformation from the nanoporous δ phase toward the dense γ phase occurs with a continuous transformation of the 010 and $ \bar 210 $ reflections of the δ form into the 020 and 200 reflections of the γ form, respectively. This analysis allows ruling out of the occurrence of a new reflection typical of an intermediate phase, as suggested by X‐ray diffraction measurements on unoriented or axially oriented samples.