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Effect of Structural Parameters on the Supramolecular Organization of Rigid‐Flexible Polymers
Author(s) -
Carbonnier Benjamin,
Andreopoulou Aikaterini K.,
Pakula Tadeusz,
Kallitsis Joannis K.
Publication year - 2005
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200400202
Subject(s) - polymer , differential scanning calorimetry , supramolecular chemistry , crystallography , diffraction , materials science , phase (matter) , monomer , chemistry , optics , crystal structure , composite material , thermodynamics , physics , organic chemistry
Summary: Rigid‐flexible polyethers consisting of terphenyl and aliphatic segments of various lengths along their main chains and disubstituted by dendritic wedges of various generations (G 0 , G 1 , and G 2 ) are examined in their bulk states. Characterization of phase transitions has been performed by means of differential scanning calorimetry (DSC) and was supported by structural information obtained from small‐angle light scattering (SALS) and polarized optical microscopy (POM) experiments. In order to characterize order on the molecular size scale, two‐dimensional (2D) wide‐angle X‐ray diffraction (WAXS) experiments have been performed for macroscopically oriented samples. All results pointed out a highly ordered nature of these materials. Both monomers and polymers were characterized. In the case of polymers, structures consisting of layered backbone sheets separated by the side dendritic moieties filling the space between them were deduced. In all cases, strong effects of molecular parameters, such as main chain flexible spacer's length and sizes of substituents, on transition temperatures (odd‐even effect), degree of orientation, and distances characteristic for the supramolecular structures, were observed.Example of 2D X‐ray diffraction patterns recorded for oriented films of the polymers PETH‐(2OC 12 H 25 ) (the zero generation).