Conformations and dipole moments of poly(methyl) methacrylate molecules☆
Review articleOpen access
Abstract:

AbstractLocal conformations of stereospecific PMMA chains have been investigated. For these chains and for atactic PMMA we calculated the mean square dipole moment 〈μ2〉 and the correlation factor g=(μ/nm2)n→∞. In the case of isotactic PMMA chains the share of tt conformations amounts to 75% of the monomer units, and in the syndio chains the amount of tt conformations is increased up to 90%. Vaues of g calculated for the isotactic and atactic chains over the entire interval of values permissible for the energy parameters that may be reconciled with experimental findings are obtainable only if it is assumed that there is a regular alternation of the directions of dipole moments of side polar groups (pendants), the rotation angle being x = 0 and 180°; in the syndio chains the probability of there being an alternation of the directions of dipole moments of the pendants 12 </ wx </ 34.

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