Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/22480
Title: Order-disorder transition in eicosylated polyethyleneimine comblike polymers
Authors: Shi, H
Zhao, Y
Jiang, S
Xin, JH 
Rottstegge, J
Xu, D
Wang, D
Keywords: Comblike polymer
Eicosylated polyethyleneimine
Order-disorder transition
Issue Date: 2007
Publisher: Elsevier
Source: Polymer, 2007, v. 48, no. 9, p. 2762-2767 How to cite?
Journal: Polymer (United Kingdom) 
Abstract: Order-disorder transition (ODT) behavior in eicosylated polyethyleneimine (PEI20C) comblike polymer obtained by grafting n-eicosyl group on polyethyleneimine backbone was systematically investigated by the combination of differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD), Fourier transform infrared (FTIR) spectroscopy as well as solid-state high resolution nuclear magnetic resonance (NMR) spectroscopy. DSC investigations showed two obvious transitions, assigned to the transitions (1) from orthorhombic to hexagonal and (2) from hexagonal to amorphous phase, respectively. These transitions are induced by the variations of alkyl side chain conformation and packing structure with temperature changing, which consequently lead to the destruction of original phase equilibrium. The ODT behavior can also be confirmed by spectroscopic methods like WAXD, FTIR and NMR. The ordered structure and the transition behavior of the alkyl side chains confined by the PEI backbone are obviously different from those of pristine normal alkanes. The transition mechanism of ODT and the origin of the phase transition behavior in PEI20C comblike polymer were discussed in detail in this paper.
URI: http://hdl.handle.net/10397/22480
ISSN: 0032-3861
EISSN: 1873-2291
DOI: 10.1016/j.polymer.2007.03.012
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