A comparative dielectric spectroscopy investigation of beta-cyclodextrin polymer and carboxymethyl beta-cyclodextrin polymer cross-linked by epichlorohydrin
作者： Panagoula K. Papaioannou , Chaido S. Karagianni , John C. Papaioannou
DOI: 10.1016/J.MOLSTRUC.2019.01.044
关键词:
摘要: Abstract The β-cyclodextrin polymer (β-CDP) and the carboxymethyl-β-cyclodextrin (CM-β-CDP) cross-linked by epichlorohydrin were investigated dielectric spectroscopy over frequency range 0.1–100 kHz in temperature ranges 132.6–464.8 K 132.9–500.9 K, respectively. β-CDP reveals a reversible order-disorder transformation of some normal hydrogen bonds to flip-flop type at Ttrans = 220.1 K, whereas CM-β-CDP doesn't show any bonds. ac-conductivity plot (lnσ vs 1/T) shows linear part obeying Arrhenius equation 289.8–268.8 K with Eα = 0.71 eV during cooling 0.77 eV heating. A deformed bell-shaped curve maximum values Ttrans = 222.7 K 223.8 K heating 132.6–268.8 K, is due hydrogen-bonded transformation. At 328.9
harvard.edu
sci-hub.se 参考文章(37)
Vladimir Frecer, Emo Chiellini, Federica Chiellini, Roberto Solaro, Jacopo Tomasi, Stanislaw Miertus, Molecular Interactions and Inclusion Phenomena in Substituted β-Cyclodextrins. Simple Inclusion Probes: H2O, C, CH4, C6H6, NH4+, HCOO− Journal of inclusion phenomena and molecular recognition in chemistry. ,vol. 32, pp. 23- 46 ,(1998) , 10.1023/A:1007956607948
József Szejtli, Cyclodextrins and their inclusion complexes ,(1982)
Stephen F. Lincoln, Christopher J. Easton, Modified Cyclodextrins: Scaffolds and Templates for Supramolecular Chemistry ,(1999)
Harold Philip Klug, Leroy Elbert Alexander, X-ray diffraction procedures for polycrystalline and amorphous materials ,(1954)
M. Samet, V. Levchenko, G. Boiteux, G. Seytre, A. Kallel, A. Serghei, Electrode polarization vs. Maxwell-Wagner-Sillars interfacial polarization in dielectric spectra of materials: Characteristic frequencies and scaling laws. Journal of Chemical Physics. ,vol. 142, pp. 194703- ,(2015) , 10.1063/1.4919877
P�ter Bak�, L�szl� Fenichel, L�szl� T�ke, Lajos Szente, J�zsef Szejtli, Methylation of Cyclodextrins Via Phase-Transfer Catalysis Journal of Inclusion Phenomena and Macrocyclic Chemistry. ,vol. 18, pp. 113- 117 ,(1994) , 10.1007/BF00708737
N. S. Murthy, H. Minor, C. Bednarczyk, S. Krimm, Structure of the amorphous phase in oriented polymers Macromolecules. ,vol. 26, pp. 1712- 1721 ,(1993) , 10.1021/MA00059A034
S. -L. Wu, I. -C. Tung, Dielectric relaxation and electrical conduction at low field of mineral-filled epoxy Journal of Materials Science. ,vol. 31, pp. 2177- 2186 ,(1996) , 10.1007/BF00356643
Nadia Morin-Crini, Grégorio Crini, Environmental applications of water-insoluble β-cyclodextrin–epichlorohydrin polymers Progress in Polymer Science. ,vol. 38, pp. 344- 368 ,(2013) , 10.1016/J.PROGPOLYMSCI.2012.06.005
Rahul V. Pinjari, Kaustubh A. Joshi, Shridhar P. Gejji, Molecular Electrostatic Potentials and Hydrogen Bonding in α-, β-, and γ-Cyclodextrins Journal of Physical Chemistry A. ,vol. 110, pp. 13073- 13080 ,(2006) , 10.1021/JP065169Z