Crystal structure of the poly(ethylene oxide)–p-nitrophenol molecular complex

Autor:	J. J. Point, Pascal Damman
Rok vydání:	1995
Předmět:	Polymers and Plastics Ethylene oxide Stereochemistry Organic Chemistry Oxide Crystal structure Triclinic crystal system chemistry.chemical_compound Crystallography Differential scanning calorimetry chemistry Materials Chemistry Molecule Fourier transform infrared spectroscopy Phase diagram
Zdroj:	Polymer International. 36:117-125
ISSN:	1097-0126 0959-8103
DOI:	10.1002/pi.1995.210360202
Popis:	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
Databáze:	OpenAIRE
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