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Dipole Moments of Dimethylsiloxane Chains

dc.contributor.authorMark, J. E.en_US
dc.date.accessioned2010-05-06T21:35:07Z
dc.date.available2010-05-06T21:35:07Z
dc.date.issued1968-08-01en_US
dc.identifier.citationMark, J. E. (1968). "Dipole Moments of Dimethylsiloxane Chains." The Journal of Chemical Physics 49(3): 1398-1402. <http://hdl.handle.net/2027.42/70069>en_US
dc.identifier.urihttps://hdl.handle.net/2027.42/70069
dc.description.abstractA rotational isometric‐state model with neighbor dependence is used to calculate mean‐square dipole moments and their temperature coefficients for dimethylsiloxane chains (CH3)3Si[OSi(CH3)2]xOSi(CH3)3 over a wide range of molecular weight. Chain conformational energies required in the calculations are obtained from a previous analysis of the random‐coil dimensions of dimethylsiloxane chains in the limit of large xx. Calculated dipole moments are in very good agreement with recently reported experimental results for oligomers corresponding to x  =  1,2,3,and5,x=1,2,3,and5, at 25°, 40°, and 60°C. A simple physical picture for the predicted values of the dipole moments and their temperature coefficients is provided. As is the case in the interpretation of the dimensions of these chain molecules, the features of paramount importance are the inequality of the bond angles about Si and O atoms and the lower energy of trans, relative to gauche, states about Si☒O and O☒Si skeletal bonds.en_US
dc.format.extent3102 bytes
dc.format.extent366291 bytes
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dc.publisherThe American Institute of Physicsen_US
dc.rights© The American Institute of Physicsen_US
dc.titleDipole Moments of Dimethylsiloxane Chainsen_US
dc.typeArticleen_US
dc.subject.hlbsecondlevelPhysicsen_US
dc.subject.hlbtoplevelScienceen_US
dc.description.peerreviewedPeer Revieweden_US
dc.contributor.affiliationumDepartment of Chemistry, University of Michigan, Ann Arbor, Michiganen_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/70069/2/JCPSA6-49-3-1398-1.pdf
dc.identifier.doi10.1063/1.1670238en_US
dc.identifier.sourceThe Journal of Chemical Physicsen_US
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dc.owningcollnamePhysics, Department of


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