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Mechanically Linked Polycarbonate

2003; American Chemical Society; Volume: 125; Issue: 8 Linguagem: Inglês

10.1021/ja0292546

1943-2984

Charles‐André Fustin, Christian Bailly, Guy J. Clarkson, Philippe de Groote, Trent H. Galow, David A. Leigh, Duncan Robertson, Alexandra M. Z. Slawin, Jenny K. Y. Wong,

Crystallography and molecular interactions

The synthesis, by solid-state copolymerization, and characterization of the first polycatenanes based on a commercial polymer are reported. Various amounts of a benzylic amide [2]catenane, the corresponding macrocycle, and a rigid bisphenol fluorene derivative have been quantitatively and homogeneously incorporated into bisphenol A polycarbonate. The resulting copolymers were characterized by size exclusion chromatography coupled with viscosimetry, (1)H NMR, differential scanning calorimetry, and dynamic mechanical analysis. The unexpectedly small influence of [2]catenane incorporation on the glass transition temperature of the copolymers points to remarkable internal mobility of the catenane comonomer rings. A new relaxation linked to the flexible catenane units is also observed. The studies represent a detailed structural characterization of a polymer containing small amounts of mechanical linkages in its backbone and demonstrate that significant effects can be induced by doping conventional polymers with small percentages (2-6% of repeat units) of flexible catenanes.