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• W2040395260 abstract "Self-consistent restricted and unrestricted Hartree-Fock calculations have been performed for the microscopic interactions in particle-filled polymeric suspensions. First, we have investigated the elongation and the torsion potential of a single infinite polyoxymethylene chain. It is found that the 9/5 helix is ensuremath{sim}4.5 kcal/mol lower in energy than the planar zigzag conformation. A Young's modulus of 80ifmmodepmelsetextpmfi{}20 GPa is obtained for the chain-direction deformation. The potential-energy curve for the van der Waals interaction between two 2/1 helical polyoxymethylene chains has a minimum for a chain separation of ensuremath{sim}4.3 Ar{} with a binding energy of ensuremath{sim}1.3 kcal per (${mathrm{CH}}_{2}$O${)}_{2}$ translational unit. For the chain-direction slip of two polyoxymethylene chains a barrier of ensuremath{sim}5.1 kcal is calculated. To study polymer-particle interactions, cluster calculations for the interaction of polyoxymethylene fragments with ammonium perchlorate and the aluminum (100) surface have been performed. The oxygen in the polyoxymethylene backbone forms a hydrogen bond with ammonium perchlorate. For an O-H distance of 1.62 Ar{} a binding energy of 23.7 kcal is obtained. This strong coordination of the ammonium ion with the oxygen in the polyether backbone is in agreement with the experimentally observed increase in viscosity of polyether lacquers upon dissolution of ammonium perchlorate. The potential energy curve for the bonding of a ${mathrm{H}}_{3}$C-O-${mathrm{CH}}_{2}$-O-${mathrm{CH}}_{2}$-O-${mathrm{CH}}_{3}$ fragment at the on-top sites of an ${mathrm{Al}}_{5}$ cluster has a minimum for an O-Al separation of 2.3 Ar{} with a binding energy of 17.1 kcal (8.55 kcal per O-Al bonding).This binding energy is of the same order of magnitude as the energy of 4.5 kcal per ${mathrm{CH}}_{2}$O unit needed to stretch the polyoxymethylene 9/5 helix to a helix whose next-nearest oxygen atoms are commensurate with the aluminum lattice constant of 4.05 Ar{}. Therefore the coating of aluminum particles with polyoxymethylene polymers is possible. The quantum-mechanical results of these microscopic static-model studies provide an estimate for polymer-particle forces needed for a macroscopic dynamic model of particle-filled polymeric suspensions." @default.
• W2040395260 created "2016-06-24" @default.
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• W2040395260 date "1988-05-15" @default.
• W2040395260 modified "2023-09-26" @default.
• W2040395260 title "Ab initiostudy of the interaction of polyoxymethylene with polyoxymethylene, ammonium perchlorate, and the aluminum (100) surface" @default.
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• W2040395260 doi "https://doi.org/10.1103/physrevb.37.8915" @default.
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