Intermolecular interaction in polymers and the physical network model

High performance nitrile copolymers for polymer electrolyte membrane fuel cells

“…It is one of the most polar functional groups, having a high dipole moment of ∼3.9 Debyes. In polymers containing functional groups, the energy of intermolecular dispersion interaction (E in kJ/mol) follows the order -COOH (45.1) > -OH (30.5) > -C N (26.3) > C O (15.1) > -NH2 (15.1), -F (7.3) [24].…”

Investigation of the structure and properties of modified polyepoxy vinyl ester networks

“…These curves were calculated in line with the theory of thermomechanical spectra [7,8]. It may be seen from Figure 3a and 3b that the MWD curves for polymers not exposed to HF, including the original PEVEN resin, are bimodal in nature -they comprise two distinctly different fractions -low-molecular with middle-ranking molecular weight of 500-1000 and high-molecular, of the order of 5000-7000.…”

“…The degree of hardening was monitored by extraction of the polymer in acetone. The molecular and topological characteristics were studied using a thermomechanical method, following a methodology that has been quite widely described in a number of works [6][7][8][9]. Thermomechanical analysis was performed using a method involving penetration of a hemispherical quartz probe with radius R 0 = 2 mm into the polymer, with the aid of a UIP-70m thermal analyser made by the TsKB UP AN SSSR {Probably: Central Design Bureau for Unique Instrument-Building, Academy of Sciences of the USSR -Translator} [7].…”

Phase-Separated Interpenetrating Polymer Networks

“…The statistical theory of network formation was developed by Flory, Stockmayer, and others [23][24][25][26]. The formation of IPNs obeys the general rules of polymer network formation, but is also much more complicated because the reaction is accompanied by phase separation.…”

“…According to Irzhak [25] the topological structure of a polymer is determined by the connectivity of the structural elements, and may be described as a graph independent of the real chemical and spatial structure and disposition of its elements in space. Topological knots are labile formations that reveal them-selves at short-time tests or through equilibrium deformation in densely cross-linked networks.…”