Order-disorder transition in eicosylated polyethyleneimine comblike polymers

Haifeng Shi, Ying Zhao, Shichun Jiang, John Haozhong Xin, Joerg Rottstegge, Duanfu Xu, Dujin Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

26 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)2762-2767
Number of pages6
JournalPolymer
Volume48
Issue number9
DOIs
Publication statusPublished - 24 Apr 2007

Keywords

  • Comblike polymer
  • Eicosylated polyethyleneimine
  • Order-disorder transition

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics

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