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Crystal structure of the poly(ethylene oxide)– p ‐nitrophenol molecular complex
Author(s) -
Damman P.,
Point J. J.
Publication year - 1995
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1995.210360202
Subject(s) - triclinic crystal system , differential scanning calorimetry , ethylene oxide , crystallography , fourier transform infrared spectroscopy , materials science , molecule , intramolecular force , crystal structure , crystal (programming language) , infrared spectroscopy , oxide , chemistry , stereochemistry , polymer , chemical engineering , copolymer , organic chemistry , thermodynamics , physics , programming language , computer science , engineering , composite material , metallurgy
A crystalline complex of poly(ethylene oxide) (PEO) and p ‐nitrophenol (PNP) was studied by differential scanning calorimetry, X‐ray diffraction, and FTIR spectroscopy, The phase diagram of this system is characterized by a peritectic reaction, and reveals the formation of a new crystal form different from those of PEO, and PNP. The triclinic unit cell of the complex was determined from the X‐ray diffraction patterns of differently oriented samples obtained by mechanical deformations or spherulitic crystallizations. Finally, the molecular packing and the conformation adopted by the PEO chains were determined by FTIR spectroscopy. Polarization measurements have shown that the aromatic rings are very nearly normal to the c parameter (chain axis) and that the 1–4 axes of PNP molecules are parallel to the a * reciprocal parameter (spherulitic growth direction). Finally, a new ( t 2 gt 2 gt 3 ) conformation is proposed for the PEO chains on the basis of a normal mode analysis and the calculation of the intramolecular energy.