Jean Claude Wittmann

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamic aspects and morphology of physical gels from isotactic polystyreneJean Michel Guenet, Jean Claude Wittmann, and Bernard LotzCite this: Macromolecules 1985, 18, 3, 420–427Publication Date (Print):March 1, 1985Publication History Published online1 May 2002Published inissue 1 March 1985https://pubs.acs.org/doi/10.1021/ma00145a021https://doi.org/10.1021/ma00145a021research-articleACS PublicationsRequest reuse permissionsArticle Views320Altmetric-Citations62LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts

Highly oriented thin films of oligo( p ‐phenylenevinylene)s , oligoPPVs, provide information about the structure of polyPPV and structure‐property relationships. It is shown that deposition of a substituted oligoPPV onto highly preoriented PTFE substrates leads to highly oriented thin films and that annealing produces a remarkable morphological change (see Figure and also the cover), an indication of epitaxial growth. magnified image

Highly oriented polysilylene layers have potential applications in electrophotography, nonlinear optics, display fabrication, and microlithography. The preparation of such layers by crystallization on a highly oriented PTFE substrate is reported, and their assessment by optical birefringence, electron diffraction and dichroic infrared experiments described. Why this orientation technique works is not yet clear, especially as it can be applied to poly(di‐ n ‐alkylsilylen)s with different crystal structures. Several possible underlying mechanisms are discussed.