Nanostructuring High Molecular Weight Isotactic Polyolefins via Processing with γ-Cyclodextrin Inclusion Compounds. Formation and Characterization of Polyolefin−γ-Cyclodextrin Inclusion Compounds
2004; American Chemical Society; Volume: 37; Issue: 21 Linguagem: Inglês
10.1021/ma0489164
ISSN1520-5835
AutoresCristian C. Rusa, Mariana Rusa, Marián A. Gómez-Fatou, I. Daniel Shin, Justin D. Fox, Alan E. Tonelli,
Tópico(s)biodegradable polymer synthesis and properties
ResumoThe present paper deals with the formation and detailed characterization of the γ-cyclodextrin (γ-CD) inclusion compounds (ICs) formed with two different high molecular weight isotactic polyolefins, i.e., polypropylene (i-PP) and poly(butene-1) (i-PB). Wide-angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC), solid-state 13C NMR, and FT-infrared (FTIR) observations were used to prove the inclusion of the guest polymer chains into the narrow channels provided by the stacks of the doughnut-shape CD molecules. The main aim of polyolefin inclusion into a solid host lattice like γ-CD is to extend and reorganize their conformations, with the hope of improving their commercial properties following their coalescence from their ICs. In the second part of the paper, both coalesced i-PP and i-PB obtained after the host γ-CD is removed reveal different characteristics as compared with the as-received or corresponding control samples.
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