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Fakultät für Biologie, Chemie und Geowissenschaften

Makromolekulare Chemie I: Prof. Hans-Werner Schmidt

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Blomenhofer, M.; Ganzleben, S.; Hanft, D.; Schmidt, H.-W.; Kristiansen, M.; Smith, P.; Stoll, K.; Mäder, D.; Hoffmann, K.: "Designer" Nucleating Agents for Polypropylene, Macromolecules, 38(9), 3688-3695 (2005) -- DOI: 10.1021/ma0473317
We report the discovery of a family of organic compounds, substituted 1,3,5-benzenetrisamides, that-depending on subtle details of their chemical structure-are capable of selectively and extremely efficiently nucleating the growth of the common -crystal modification of the major industrial polymer isotactic polypropylene (i-PP), rendering this normally turbid material highly transparent ("clarified") at exceedingly low concentrations (as low as a weight fraction of 0.0002), inducing the mechanically distinct, tough i-PP -polymorph, or promoting growth of hybrids of both crystallographic modifications with heretofore unknown combinations of the above desirable optical-mechanical properties. In addition, these trisamide-based compounds exhibit excellent thermal stability and do not feature absorption of visible light, adding to a most favorable set of characteristics that provides marked benefits over the presently employed nucleating/clarifying agents.
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