Syndiotactic Polystyrene Films with Different Uniplanar Orientations: Additional Information on Crystal Phase Transitions. Issue 1 (19th November 2012)

• Record Type: Journal Article
• Authors: Rizzo, Paola; Albunia, Alexandra R.; Guerra, Gaetano
• Is Part Of: Macromolecular chemistry and physics. Volume 214:Issue 1(2013:Jan.)
• Page Start: 41
• Page End: 45
• Publication Date: 2012-11-19
• Subjects: Polymers -- Periodicals; Polymerization -- Periodicals; Synthetic products -- Periodicals; Macromolecules -- Periodicals; 547.7
• DOI: 10.1002/macp.201200275
• Languages: English
• ISSNs: 1022-1352

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Syndiotactic polystyrene δ form films, exhibiting <italic>a</italic>_//<italic>c</italic>_// and <italic>a</italic>_⟂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 <tex-math notation="tex"><![CDATA[$ \bar 210 $]]></tex-math><inline-graphic xlink:href="ark:/27927/pgg1qc83p50" mimetype="image" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /> 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.</p> </abstract>