Characterization of Fibrous Aggregated Morphologies and Other Complex Architectures Self-Assembled from Helical Alkyne and Triazole Polycarbodiimides (R)- and (S)-Families in the Bulk an
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- 作者：Oleg V. Kulikov ; Dumindika A. Siriwardane ; James F. Reuther ; Gregory T. McCandless ; Hao-Jan Sun ; Yuanchao Li ; Samsuddin F. Mahmood ; Sergei S. Sheiko ; Virgil Percec ; Bruce M. Novak
- 刊名：Macromolecules
- 出版年：2015
- 出版时间：June 23, 2015
- 年：2015
- 卷：48
- 期：12
- 页码：4088-4103
- 全文大小：1863K
- ISSN：1520-5835
文摘
We report here the self-assembly studies of 22 polycarbodiimides (PCDs) in complex morphologies such as fibers, looped fibers, fibrous networks, ribbons, worm-like aggregates, toroidal structures, and craters that were examined by combination of TMAFM, TEM, SEM, and powder XRD methods as well as semiempirical modeling. Morphology characterization in the thin film (TMAFM, TEM) and in bulk (SEM, pXRD) revealed the formation of fiber-like aggregates assembled from the bundles of individual helices. In certain cases superhelical motifs of both right- and left-handed screw senses were identified. It seemed likely that the great variety of morphologies observed is a result of extensive hydrophobic side chain/side chain interactions of the singular polycarbodiimide strands.