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Rigidity of segments of poly (ethyl methacrylate) in CCl 14 solutions
Author(s) -
Huyskens P. L.,
Vael C.,
Vandevyvere P.
Publication year - 1990
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19900390105
Subject(s) - rigidity (electromagnetism) , dipole , methacrylate , london dispersion force , molecule , polymer , solvent , stiffness , chemistry , chemical physics , polymer chemistry , materials science , computational chemistry , molecular physics , composite material , organic chemistry , copolymer , van der waals force
Collegial dispersion forces originate from a coordination of the temporary electronic dipoles of a series of molecules. To insure this coordination the nuclei on a row have to replace their individual vibrations by coupled ones. Such row is then rigid. For polymers collegial forces can already be temporarily active in given parts of a solution but are regularly annihilated by intrusion of the solvent. However the regular passage through the rigid state modifies the distribution of the dipole moments during the interval that solvent or ligand molecules are in contact with the segment. In a rigid domain the correlation parameter of Kirkwood g is zero. The existence of such rigidity in solution is demonstrated by the low experimental value of g mA for the dipoles of the complexes between poly(ethyl methacrylate) and phenols. Due to the large number of segments that separate the complexes the classical explanation of stiffness of the chain due to individual interactions between neighbours does not hold.