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Dipole moments of poly(ethylene oxide) glycols and poly(propylene oxide) glycols in dilute solutions.
Date
1975
Author
Kibritoğlu, Hamide
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https://hdl.handle.net/11511/8007
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Graduate School of Natural and Applied Sciences, Thesis
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Dipole moments of poly(propylene oxide) (PPO) samples with different tacticities were determined from dielectric constant and refractive index increment measurements, which were performed on dilute toluene and isooctane solutions. In contrast to previous reports, both refractive index increments and the dipole moment ratios showed a marked dependence on the tacticities of the samples. The dipole moment ratios of isotactic samples were greater than unity and decreased with increasing sequence concentration...
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A method for evaluating the dipole moments of copolymers in relation to the distribution of polar unit sequences is proposed. Experimental data on the synthesis and dipole moments of styrene-p-chlorostyrene and styrene-p-methoxystyrene copolymers were used to calculate the effective dipole moment of a polar unit in a copolymer. For this purpose, we assumed the following effective moment values for the corresponding polar unit sequences along the copolymer chains: when both of the nearest neighbours are pola...
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H. Kibritoğlu, “Dipole moments of poly(ethylene oxide) glycols and poly(propylene oxide) glycols in dilute solutions.,” Middle East Technical University, 1975.